Mineral Guide

How to Store Stone Bracelets: Keeping Each Stone in Its Best Condition
Quick Answer Store each stone bracelet separately — in individual soft pouches or compartments — so that harder stones don't scratch softer ones. Keep away from direct sunlight (amethyst fades; obsidian's mirror surface shows heat stress over time). Keep hematite dry and away from humidity. Lay bracelets flat or loosely coiled rather than tightly wound, which stresses the elastic cord at the knot. The goal is to minimize stone-to-stone contact, moisture, and UV exposure. Why Storage Matters More Than It Seems Most damage to stone bracelets happens not during wear... Read more...
What Is Tourmaline? The Mineral That Comes in Every Color
Quick Answer Tourmaline is a boron silicate mineral with the widest natural color range of any single mineral group — it occurs in red, pink, orange, yellow, green, blue, violet, brown, black, and colorless, sometimes with multiple colors in the same crystal. The color comes from different trace elements substituting into the crystal structure: manganese produces pink and red; iron produces blue, green, and yellow; chromium produces vivid green. At Mohs 7–7.5, colored tourmaline is appropriate for daily wear. Why Tourmaline Has So Many Colors Tourmaline's exceptional color range comes... Read more...
What Is Prehnite? The Apple-Green Stone With Fog Inside
Quick Answer Prehnite is a calcium aluminum phyllosilicate — Ca₂Al(AlSi₃O₁₀)(OH)₂ — with a distinctive pale apple-green to mint color and a semi-translucent, slightly foggy visual quality. Many specimens contain dark needle-like inclusions of epidote or actinolite that create internal landscape patterns within the stone. At Mohs 6–6.5, it's appropriate for daily wear with reasonable care. Its color occupies a soft, cool-green register that no other common bracelet stone fills. A Phyllosilicate With Unusual Transparency Prehnite belongs to the phyllosilicate group — sheet silicates, the same broad class as micas and... Read more...
What Is Jade? The Two Minerals That Share One Name
Quick Answer “Jade” is not a single mineral. It refers to two completely different minerals — nephrite (calcium magnesium iron silicate) and jadeite (sodium aluminum silicate) — that happen to look similar and share a cultural history. Nephrite is the more common form historically used in East Asia. Jadeite is rarer, harder, and includes the most prized “Imperial jade” green. Both are tough stones with interlocking crystal structures that make them resistant to fracture, which is why jade has been used for tools and ornaments for thousands of years. Two... Read more...
Labradorite vs Tiger's Eye: Two Stones That Move Differently
Quick Answer Labradorite is a feldspar with a cold electric flash (labradorescence) — a structural optical effect that produces blue, green, or gold color from thin-film interference. Tiger's eye is a quartz pseudomorph with a warm moving silk band (chatoyancy) — a fiber-reflection effect that produces a single silky highlight traveling across the surface. Labradorite is dark and dramatic; tiger's eye is warm and continuous. Both are in the Wilderness Series. The choice is between cold flash and warm shimmer. Two Different Kinds of Movement Both labradorite and tiger's eye... Read more...
What Is Garnet? The Mineral Family That Comes in Every Color
Quick Answer Garnet is not a single mineral — it's a group of six related silicate minerals (almandine, pyrope, spessartine, grossular, andradite, uvarovite) that share the same cubic crystal structure but differ in chemical composition. The classic deep red garnet is almandine, colored by iron. Garnet also occurs in orange, green, yellow, and colorless varieties. At Mohs 6.5–7.5, most garnets are appropriate for daily wear and among the more durable bracelet stones. A Family, Not a Single Stone When people say "garnet," they usually mean almandine — the deep red... Read more...
What Is Carnelian? The Orange Chalcedony With Iron at Its Core
Quick Answer Carnelian is chalcedony — a microcrystalline variety of quartz — colored by iron oxide, specifically hematite and goethite distributed through the stone's fine-grained crystal matrix. The orange color ranges from pale yellow-orange to deep red-orange depending on the iron concentration and oxidation state. Unlike transparent quartz like amethyst, carnelian is translucent at best: the microscopic crystal structure scatters light rather than transmitting it cleanly. At Mohs 6.5–7, it's appropriate for daily wear. Chalcedony — Quartz You Can't See Into The quartz minerals split into two structural categories: macrocrystalline... Read more...
How to Clean Stone Bracelets: A Stone-by-Stone Guide
Quick Answer For most stone bracelets: wipe with a soft dry cloth after wearing, and occasionally clean with a slightly damp cloth and plain water. No soap, no ultrasonic cleaners, no prolonged soaking. The exceptions are important — malachite, lapis lazuli, and hematite need dry cleaning only; soft stones like fluorite and rhodonite need the gentlest treatment. The elastic cord is often the first thing to degrade, and keeping it dry is as important as cleaning the stones. Why Cleaning Method Matters by Stone Stone bracelets look similar on the... Read more...
What Is Fluorite? The Mineral That Invented Fluorescence
Quick Answer Fluorite is calcium fluoride — CaF₂ — a halide mineral, not a silicate. Its color bands form in alternating growth zones as different trace elements incorporate into the crystal at different stages of formation. The same mineral that gave its name to fluorescence: fluorite glows blue or green under UV light. At Mohs 4, it's significantly softer than most bracelet stones and has perfect octahedral cleavage, making it the most fragile of the commonly used decorative minerals. Not a Silicate Almost every stone discussed in this guide is... Read more...
Amethyst vs Smoky Quartz: Same Mineral, Opposite Temperatures
Quick Answer Amethyst and smoky quartz are both silicon dioxide — the same mineral, different color mechanisms. Amethyst's purple comes from iron and aluminum impurities altered by natural radiation; smoky quartz's brown-grey comes from aluminum impurities altered by a different radiation mechanism. The practical difference: amethyst is cool and purple, smoky quartz is warm and brown. Amethyst can fade in strong sunlight over years; smoky quartz is more light-stable. Both are Mohs 7 and appropriate for daily wear. The Same Mineral, Colored by Different Physics Both amethyst and smoky quartz... Read more...
What Is Lapis Lazuli? The Rock That Looks Like a Night Sky
Quick Answer Lapis lazuli is a metamorphic rock — not a mineral. It's composed primarily of lazurite (which gives the blue), pyrite (the gold flecks), and calcite (the white patches), along with smaller amounts of other minerals. The depth and saturation of the blue comes from a sulfur-containing compound within the lazurite crystal structure. No other blue stone has exactly this combination of saturated color, metallic gold, and white contrast in the same material. A Rock, Not a Mineral Most stones used in jewelry are single minerals — quartz, tourmaline,... Read more...
What Is Sunstone? The Feldspar That Glitters From the Inside
Quick Answer Sunstone is a plagioclase or orthoclase feldspar containing tiny reflective platelets — usually copper or hematite — that are suspended inside the crystal. As light strikes these platelets from different angles, they return small flashes of metallic light throughout the stone's interior. This effect is called aventurescence. Unlike labradorite's single directional flash, sunstone's sparkle is distributed across the stone's entire volume, producing a warm internal glitter rather than a single moving band. Aventurescence — Glitter From Inside the Stone Aventurescence is the technical term for the metallic glitter... Read more...
How to Build a Stone Bracelet Collection: A Systematic Approach
Quick Answer Start with one stone that you'll actually wear. Wear it long enough to understand what it does and doesn't give you — then choose the next stone to fill the gap. A collection of four or five well-chosen stones is more useful than fifteen accumulated at random. The goal isn't completeness; it's having the right stone available for each context you actually encounter. The Problem With Collecting Most people who accumulate stone bracelets end up wearing the same one or two consistently while the rest sit in a... Read more...
What Is Rhodonite? The Pink Stone With Black Veins
Quick Answer Rhodonite is a manganese inosilicate mineral — MnSiO₃ — whose pink color comes from manganese in its crystal structure. The black veins characteristic of most rhodonite are manganese oxide (primarily pyrolusite), formed when manganese-bearing solutions oxidize along fractures in the stone. At Mohs 5.5–6.5, rhodonite is softer than most bracelet stones and requires more careful handling than quartz-family materials. The Chemistry of Pink and Black Rhodonite belongs to the inosilicate group — chain silicates, as opposed to the framework silicates (quartz family). Its defining element is manganese, which... Read more...
Smoky Quartz vs Black Tourmaline: Two Dark Stones, Two Completely Different Experiences
Quick Answer Smoky quartz is transparent brown-grey quartz — it lets light through and has visible depth. Black tourmaline is opaque black mineral — it absorbs light and presents a still, dense surface. Smoky quartz is warmer, more visually open; tourmaline is darker, more visually closed. Tourmaline is harder (Mohs 7–7.5 vs 7) and the better daily wear choice. Smoky quartz rewards visual attention; tourmaline rewards consistent physical presence. Both Dark. Nothing Else in Common. Smoky quartz and black tourmaline are both dark stones and both appear in the Bedrock... Read more...
Stone Bracelet Size Guide: How to Measure and Choose the Right Fit
Quick Answer Measure your wrist circumference with a soft tape measure or strip of paper. Add 1–2cm for a standard fit — snug enough to stay in place, loose enough to move naturally. Most adult women measure 14–17cm and wear 16–18cm bracelets. Most adult men measure 17–20cm and wear 18–21cm bracelets. When in doubt, size up — a slightly loose bracelet is more wearable than one that's too tight to put on. Two Variables, One Decision Bracelet sizing comes down to two numbers: your wrist circumference (a fixed measurement) and... Read more...
What Is Black Tourmaline? The Most Practical of the Dark Stones
Quick Answer Black tourmaline — mineralogically called schorl — is a sodium iron boron silicate with one of the most complex chemical structures of any common gemstone mineral. At Mohs 7–7.5 it's the hardest of the common dark bracelet stones, more durable than obsidian (5–5.5) and hematite (5.5–6.5). Its surface absorbs light rather than reflecting it, producing a visual quality that is dense, still, and grounding. It's the lowest-maintenance dark stone available. The Chemistry Behind the Black Tourmaline is chemically one of the most complex silicate minerals on earth. Its... Read more...
Natural Stone vs Synthetic Crystal: What You're Actually Buying
Quick Answer "Real" and "fake" are imprecise terms that obscure more than they reveal. Stone bracelets fall into four categories: natural (mined from the earth), synthetic (same chemistry as the natural stone, grown in a lab), glass imitation (looks similar but is entirely different material), and treated (natural stone with enhanced color or appearance). Each category has different properties, different value, and different things worth knowing before you buy. Four Categories, Not Two The popular framing of stone bracelets as "real" versus "fake" collapses four meaningfully different categories into a... Read more...
What Is Citrine? The Yellow Quartz That's Rarely What It Seems
Quick Answer Citrine is yellow quartz. Natural citrine gets its color from ferric iron impurities in the crystal lattice. Most commercial citrine, however, is heat-treated amethyst or smoky quartz — the same mineral, with the color centers transformed by controlled heating. Both are real quartz and both are stable. The practical difference is color: natural citrine is pale yellow to light gold; heat-treated material tends toward deep orange-red tones that don't occur naturally. The Same Mineral, Three Different Colors Quartz is silicon dioxide — the world's most abundant mineral. What... Read more...
What Is Malachite? The Copper Mineral With Banded Green
Quick Answer Malachite is a copper carbonate hydroxide mineral — Cu₂(CO₃)(OH)₂ — formed where copper ore deposits have been altered by water and carbon dioxide. Its vivid green comes entirely from copper. Its distinctive banded patterns are concentric growth rings, similar in principle to tree rings, formed as the mineral precipitates in layers. At Mohs 3.5–4, it's significantly softer than most bracelet stones and requires more careful handling than quartz-family materials. Copper, Not Silicon The vast majority of stones used in jewelry are silicates — minerals built around silicon-oxygen frameworks.... Read more...
How to Choose a Stone Bracelet as a Gift: A Practical Guide
How to Choose a Stone Bracelet as a Gift: A Practical Guide
Quick Answer Choosing a stone bracelet as a gift comes down to two things: the stone (which reflects something true about the recipient) and the size (which determines whether it... Read more...
What Is Hematite? The Iron Stone That Feels Like Metal
What Is Hematite? The Iron Stone That Feels Like Metal
Quick Answer Hematite is iron oxide — Fe₂O₃ — one of the most abundant iron minerals on Earth and a major iron ore. As a bracelet stone, it's notable for... Read more...
Amethyst vs Rose Quartz: Same Family, Completely Different Stones
Amethyst vs Rose Quartz: Same Family, Completely Different Stones
Quick Answer Amethyst is transparent purple quartz colored by iron impurities and radiation. Rose quartz is milky pink quartz colored by microscopic mineral fiber inclusions. Amethyst is glassy and see-through;... Read more...
What Is Green Aventurine? The Quartz With a Sparkle Inside
What Is Green Aventurine? The Quartz With a Sparkle Inside
Quick Answer Green aventurine is a variety of quartz containing small platelets of fuchsite — a chromium-rich mica — that produce a sparkling optical effect called aventurescence. The green color... Read more...
What Is Aquamarine? The Blue-Green Beryl of Deep Water
What Is Aquamarine? The Blue-Green Beryl of Deep Water
Quick Answer Aquamarine is a variety of beryl — the mineral family that also includes emerald and morganite — colored blue-green by iron impurities. Its color ranges from pale sky... Read more...
Labradorite vs Moonstone: Two Stones That Glow Differently
Labradorite vs Moonstone: Two Stones That Glow Differently
Quick Answer Labradorite flashes — its light is directional, sharp, and appears only at certain angles. Moonstone glows — its light is diffused, soft, and always present. Labradorite has a... Read more...
How to Care for a Natural Stone Bracelet: A Practical Guide
How to Care for a Natural Stone Bracelet: A Practical Guide
Quick Answer A stone bracelet has two components with different lifespans: the stone (which lasts indefinitely with basic care) and the elastic cord (which degrades over time regardless). Clean the... Read more...
What Is Moss Agate? The Stone That Grows a Landscape Inside
What Is Moss Agate? The Stone That Grows a Landscape Inside
Quick Answer Moss agate is a translucent chalcedony quartz containing green, brown, or black mineral inclusions — typically hornblende or chlorite — that form branching, dendritic patterns resembling moss, ferns,... Read more...
What Is Smoky Quartz? The Dark Transparency of Deep Earth
What Is Smoky Quartz? The Dark Transparency of Deep Earth
Quick Answer Smoky quartz is quartz — the same mineral as clear quartz, amethyst, and rose quartz — colored grey-brown by aluminum impurities that have been altered by natural radiation.... Read more...
What Stone Is Right for Me? Three Questions That Actually Help
What Stone Is Right for Me? Three Questions That Actually Help
Quick Answer The right stone is the one you'll actually notice on your wrist. That means choosing by what you want to look at (optical behavior), how much weight you... Read more...
Obsidian vs Black Tourmaline: How to Choose Between the Two Dark Stones
Obsidian vs Black Tourmaline: How to Choose Between the Two Dark Stones
Quick Answer Obsidian is volcanic glass — mirror-gloss surface, reflects light back at you. Black tourmaline is a crystalline mineral — semi-lustrous, absorbs light, holds it. Obsidian is visually confrontational;... Read more...
What Is Rose Quartz? The Pink Stone With an Unexplained Color
What Is Rose Quartz? The Pink Stone With an Unexplained Color
Quick Answer Rose quartz is pink quartz, but its color mechanism is unusual. Unlike amethyst (iron + radiation) or smoky quartz (aluminum + radiation), rose quartz gets its color primarily... Read more...
What Is Amethyst? The Purple Quartz and What Makes Its Color Real
What Is Amethyst? The Purple Quartz and What Makes Its Color Real
Quick Answer Amethyst is quartz — the same mineral as clear quartz, smoky quartz, and rose quartz — colored purple by iron impurities that have been altered by natural gamma... Read more...
What Is Obsidian? The Volcanic Glass That Reflects Everything
What Is Obsidian? The Volcanic Glass That Reflects Everything
Quick Answer Obsidian is not a mineral. It's a naturally occurring volcanic glass — formed when silica-rich lava cools so rapidly that atoms don't have time to arrange themselves into... Read more...
What Is Moonstone? The Stone That Glows From Within
What Is Moonstone? The Stone That Glows From Within
Quick Answer Moonstone is an orthoclase feldspar mineral known for adularescence — a soft, billowing glow that appears to float beneath the stone's surface. Unlike labradorite's sharp directional flash, moonstone's... Read more...
Why Some Stone Bracelets Are Meant to Be Worn Alone
Why Some Stone Bracelets Are Meant to Be Worn Alone
Quick Answer Stacking works when the individual stones are visually simple enough to need company. When a stone has its own optical complexity — labradorescence, chatoyancy, deep translucency, strong banding... Read more...
The Triple Protection Bracelet: Black Tourmaline, Tiger's Eye & Labradorite
The Triple Protection Bracelet: Black Tourmaline, Tiger's Eye & Labradorite
Quick Answer The triple protection bracelet typically combines black tourmaline, tiger's eye, and labradorite — three stones that happen to be visually and materially distinct from each other. Black tourmaline... Read more...
What Is Tiger's Eye? The Stone With a Moving Light Inside
What Is Tiger's Eye? The Stone With a Moving Light Inside
Tiger's eye is a quartz mineral with chatoyancy — a silky moving shimmer caused by parallel fiber structures inside the stone. Here's what's actually happening, and what it's like to... Read more...
What Is Labradorite? The Stone That Changes Every Time You Look at It
What Is Labradorite? The Stone That Changes Every Time You Look at It
Labradorite is a feldspar mineral known for labradorescence — an optical effect that makes it flash blue, gold, and green depending on angle. Here's what's actually happening inside the stone. Read more...
How to Choose a Gemstone Bracelet: A Practical Guide to Finding the Right Stone for Your Wrist
How to Choose a Gemstone Bracelet: A Practical Guide to Finding the Right Stone for Your Wrist
Not all gemstone bracelets wear the same. This guide breaks down how to choose by stone type, weight, durability, and what you actually want to feel on your wrist. Read more...
What Does It Mean to Feel Grounded? A Guide to Stone Bracelets for Anxious Days
What Does It Mean to Feel Grounded? A Guide to Stone Bracelets for Anxious Days
Feeling unmoored? This guide explores which natural stone bracelets help you return to yourself — not through belief, but through weight, texture, and presence. Read more...
Baroque Pearl vs. Freshwater Pearl: What's the Difference
Baroque Pearl vs. Freshwater Pearl: What's the Difference
Both are real pearls. Both come from freshwater. So what's the difference? Here's what baroque actually means, why it costs more, and how to tell them apart. Read more...
The Island Codex: SITU's Philosophy on Wearing Stone
The Island Codex: SITU's Philosophy on Wearing Stone
Why we wear stone, what we believe it does, and what it doesn't. The foundational principles behind every piece SITU makes — and every choice we don't make. Read more...
A Guide to Stone Textures: Tumbled, Raw, Baroque & Double Point
A Guide to Stone Textures: Tumbled, Raw, Baroque & Double Point
The same mineral in four different forms wears completely differently. Here's what tumbled, raw, baroque, and double point actually mean — and how to choose. Read more...
How to Tell If Your Stone Is Dyed: A Buyer's Guide to Natural vs Treated Crystal
How to Tell If Your Stone Is Dyed: A Buyer's Guide to Natural vs Treated Crystal
Dyed stones and natural stones can look identical at first glance. Here are four things to check before you buy — no equipment needed. Read more...
What Is Larimar? How Ocean Geology Shapes the SITU Tide Series
What Is Larimar? How Ocean Geology Shapes the SITU Tide Series
Larimar, blue apatite, baroque pearl — the Tide Series is built from stones shaped by water over millions of years. Here's the geology behind the design. Read more...
Why We Don't Make "Lucky Crystal" Jewelry
Why We Don't Make "Lucky Crystal" Jewelry
Most crystal brands sell luck. We don't. Here's the philosophy behind how SITU chooses stones — and why we think that distinction matters. Read more...
How to Choose a Crystal: 5 Principles for Finding the Right Stone
How to Choose a Crystal: 5 Principles for Finding the Right Stone
Not sure which stone is right for you? At SITU, choosing a stone begins with instinct. This guide walks you through five simple principles for finding the piece that was... Read more...
Why Is Every Natural Crystal Different? The Geology Behind Mineral Uniqueness
Why Is Every Natural Crystal Different? The Geology Behind Mineral Uniqueness
Minerals are the condensation of Earth's ages. Every ice crack and inclusion is a record of tectonic shifts deep below. By understanding their origins, you will realize that the weight... Read more...
Crystal Cleansing Guide: 3 Simple Rituals for Energy Renewal
Crystal Cleansing Guide: 3 Simple Rituals for Energy Renewal
Daily stress can weigh down both your crystals and your spirit. This guide shares three simple cleansing methods you can perform at home. Through these easy steps, you can restore... Read more...