Moonstone
Gemstone Guide
Moonstone at a Glance
Moonstone is a feldspar mineral best known for adularescence — a billowing, internal glow that appears to float just beneath the surface. It's not reflected light. It's light scattered between microscopic layers inside the stone itself.
What Is Adularescence?
The signature optical phenomenon that makes moonstone unlike any other gemstone. Microscopic layers of alternating feldspar minerals (orthoclase and albite) scatter light internally, creating a floating blue or white glow that appears to move across the stone's surface as the viewing angle changes. Named after Mount Adular in Switzerland, where fine moonstone was first documented.
Why "Moonstone"?
Ancient Romans believed the stone was formed from solidified moonbeams. The name has stuck for millennia because the optical effect genuinely resembles moonlight — a soft, ethereal glow that shifts and breathes as you move. In Hindu mythology, moonstone is considered sacred, made from moonbeams crystallized over thousands of years.
How Moonstone Forms
Moonstone forms deep in the earth when two feldspar minerals — orthoclase and albite — cool together slowly inside igneous and metamorphic rocks. The magic happens during cooling.
Step 1: Magma Cools Slowly
Deep underground, molten rock containing potassium and sodium feldspars begins to cool. At high temperatures, these two minerals mix freely — they're chemically compatible in liquid form.
Step 2: Exsolution Begins
As the temperature drops below approximately 650°C, the orthoclase and albite can no longer stay mixed. They separate into alternating microscopic layers — like oil and water settling into bands. These layers are typically only 0.5 micrometers thick.
Step 3: Adularescence Is Born
When light enters the stone and hits these sub-microscopic layers, it scatters. The thinner the layers, the bluer the glow. Thicker layers produce a white or silver sheen. The finest blue moonstone has the thinnest, most uniform internal layers — which is why it commands premium prices.
Why Slow Cooling Matters
Rapid cooling produces feldspars without the layered internal structure — and therefore no adularescence. Only moonstone that formed under exactly the right conditions, cooling slowly enough for the layers to develop uniformly, produces the characteristic floating glow. This is why fine moonstone is rarer than it appears.
Where Moonstone Comes From
Not all moonstone is equal. The source determines the body color, the quality of adularescence, and the price. Here's what the jewelry world knows about where the best specimens originate.
Sri Lanka — The Gold Standard
Sri Lankan moonstone (also called Ceylon moonstone) produces the finest blue adularescence in the world — a transparent to semi-transparent body with a vivid floating blue sheen. The mines in Meetiyagoda are the most famous source. Fine Sri Lankan material is increasingly scarce and commands premium prices.
India — Rainbow Moonstone
India produces much of the world's "rainbow moonstone" — which is technically a transparent labradorite, not true orthoclase moonstone. It displays multicolored flashes (blue, gold, purple) rather than the single blue glow of classical moonstone. Beautiful in its own right, but mineralogically distinct.
Myanmar (Burma)
Myanmar produces high-quality moonstone with strong blue adularescence, sometimes rivaling Sri Lankan material. Less commonly available in the market due to sourcing concerns, but gemologically excellent.
Madagascar & Tanzania
Increasingly important sources producing good-quality moonstone with white to peach body colors. African moonstone tends to be more opaque than Sri Lankan material but can display beautiful adularescence at an accessible price point.
Andrea Li sources moonstone primarily at the Tucson Gem Show, selecting each stone individually for the quality of its adularescence — that floating blue glow is what makes or breaks a moonstone piece.
Moonstone Varieties
The name "moonstone" covers several related but distinct gemstones. Understanding the differences matters — especially when you're investing in a one-of-a-kind piece.
| Variety | Classical Moonstone | Rainbow Moonstone | Peach Moonstone |
|---|---|---|---|
| Mineral | Orthoclase feldspar | Labradorite feldspar | Orthoclase feldspar |
| Body Color | Transparent to milky white | Transparent with inclusions | Warm peach to champagne |
| Optical Effect | Blue adularescence (single glow) | Multicolor flash (blue, gold, purple) | Soft white adularescence |
| Primary Sources | Sri Lanka, Myanmar | India, Madagascar | India, Tanzania |
| Price Range | Moderate–premium (for blue) | Affordable–moderate | Affordable–moderate |
| Personality | Ethereal, timeless | Vibrant, magical | Warm, romantic |
Important: "Rainbow moonstone" is technically a transparent labradorite, not true orthoclase moonstone. Both are feldspar minerals and both display beautiful optical effects, but they achieve them through different internal structures. The distinction matters for gemstone purists; for jewelry lovers, both are stunning.
Caring for Moonstone Jewelry
Moonstone is softer than many popular gemstones (6–6.5 Mohs vs. 7+ for quartz and beryl). It's absolutely wearable — but it rewards a little attention. Here's what to do and what to avoid.
Store Separately
Keep moonstone in its own soft pouch or lined compartment. Harder stones (quartz, sapphire, diamond) will scratch it if they share space.
Hard Impact
Moonstone has two cleavage planes — internal directions where the crystal can split if hit hard. Bezel settings protect the stone better than prong settings for everyday wear.
Clean Gently
Warm water, mild soap, soft cloth. That's it. Moonstone's adularescence comes from its internal structure — no amount of polishing will change or improve the glow. Just keep the surface clean so light can enter freely.
Ultrasonic & Steam Cleaners
Both can cause damage along cleavage planes. Never use chemical cleaners, bleach, or abrasive materials. The "last on, first off" rule applies — put moonstone jewelry on after perfume, lotions, and hairspray.
Wear Necklaces & Earrings Daily
Moonstone is perfectly durable for necklaces and earrings, which face minimal impact risk. These are the best everyday moonstone pieces — the stone catches light beautifully at the neck and ear.
Heavy-Duty Ring Wear
Rings take the most abuse of any jewelry piece. Moonstone rings are beautiful for occasional wear, but if you're hard on your hands, consider moonstone in a necklace or earrings instead — same stone, less risk.
Moonstone as a Bridal Stone
Moonstone is one of the most photogenic gemstones for weddings — and one of the most meaningful. Here's why it's becoming the stone of choice for brides who want something beyond diamonds and pearls.
Why Moonstone Photographs Beautifully at Weddings
Adularescence — that floating internal glow — responds to light in a way that cameras love. In soft ceremony lighting, moonstone glows from within. In golden hour portraits, the blue sheen intensifies. Under reception lighting, it catches every shift and angle. Unlike diamonds (which can blow out in flash photography) or opaque stones (which can read flat), moonstone has a living quality in photos that matches the emotion of the day.
For the Bride
A moonstone necklace or pair of earrings serves as a luminous, non-traditional "something borrowed from the earth." For the bride who was never going to wear the expected strand of pearls, moonstone offers the same elegance with an entirely different energy — ethereal, personal, impossible to replicate.
For the Mother of the Bride
Moonstone's understated glow is elegant without competing with the bride. A sculptural moonstone piece signals taste and intentionality — this is a woman who chose her jewelry as carefully as she raised her daughter.
For Wedding Guests
A one-of-a-kind moonstone piece is a conversation starter that doesn't upstage the couple. The stone's shifting glow gives you something interesting to wear without crossing the line into too-much.
"Something Blue"
Blue adularescence is a natural "something blue" — not a novelty garter or a painted sole, but an ancient, organic phenomenon occurring inside a gemstone. For the bride who wants tradition with depth, this is the answer.
Andrea Li Handcrafted Moonstone Jewelry
Moonstone, the feldspar mineral that carries its own light. Adularescence, a floating blue glow born from microscopic layers deep inside the stone, is what makes moonstone unlike anything else in a jeweler's case. It doesn't reflect light. It scatters it.
Andrea Li designed the Femme Fatale collection around moonstone's singular ability to shift and breathe with movement — handcrafting each piece in 14k gold, gold-filled, and sterling silver in her Denver studio. Every piece was one of a kind. Every piece has sold. But the stones themselves keep arriving at the Tucson Gem Show, and Andrea keeps choosing the ones with the strongest blue fire.
Sourced primarily from Sri Lanka and India, moonstone ranks 6–6.5 on the Mohs hardness scale. It's softer than quartz but perfectly suited for everyday necklaces and earrings. If you've ever been drawn to a gemstone that seems to hold moonlight inside it, this is the one.
Love What You See? Let Me Make You One.
Every piece in the Femme Fatale moonstone collection was one of a kind — handcrafted once, sold once, never repeated. The pieces shown here have found their owners. But moonstone is a stone Andrea loves working with, and she'd love to design something new for you.
Start a Commission →Or explore the moonstone guide to learn more about this gemstone.