Moonstone Varieties: A Complete Guide to Rainbow, Blue, and Beyond

There's something almost otherworldly about holding a moonstone up to the light and watching that soft, internal glow shift and float across the surface. It doesn't flash like opal or sparkle like diamond. Instead, it does something quieter and, honestly, more mysterious — it seems to hold light inside itself and move it around at will. That phenomenon has a name: adularescence. And it's the single reason moonstone has fascinated people for thousands of years, from Roman jewelers who believed the stone captured actual moonlight to modern crystal collectors who can't stop buying them.

But here's the thing most beginners don't realize until they've been collecting for a while: "moonstone" isn't just one thing. Walk into any gem show or scroll through Etsy listings and you'll encounter white, blue, rainbow, peach, gray, and even green specimens — all sold under the same umbrella name. Some of these are genuinely the same mineral family. Others? That's where it gets complicated, and honestly, pretty interesting.

This article breaks down every major moonstone variety you'll encounter, what makes each one different, what you should actually pay, and the one debate that still gets mineralogists arguing at conferences. Let's sort it out.

What Moonstone Actually Is (The Science, Briefly)

Moonstone belongs to the feldspar family, which is honestly the most abundant mineral group on Earth's crust. The specific type that earns the "moonstone" label is typically adularia, a potassium-rich feldspar (orthoclase) that forms at relatively low temperatures. What sets it apart from regular feldspar is its internal structure.

Inside a quality moonstone, there are microscopic layers of two different feldspar compositions that grew together as the crystal formed. One layer is potassium-rich, the other is sodium-rich. When light enters the stone, these alternating layers scatter it through a process called adularescence — sometimes also described as the schiller effect, though purists will tell you those are technically different mechanisms. The result is that floating, billowy glow that seems to sit just below the surface and follow your eye as you tilt the stone.

The color of that glow — blue, white, rainbow, or peach — depends entirely on the thickness of those internal layers and any trace minerals present. Thinner layers produce blue adularescence (the most prized). Thicker layers shift toward white. Iron content pushes things into peach or tan territory. And when labradorite gets involved, you get the whole rainbow.

It's worth noting that moonstone sits at 6 to 6.5 on the Mohs hardness scale. That's harder than glass but softer than quartz. It'll scratch if you're not careful, and it can chip along its natural cleavage planes. More on care later, but keep that number in mind when deciding whether to set one in a ring you'll wear daily.

The Big Five: Moonstone Varieties Compared

White Moonstone — The Entry Point

If you've ever seen a moonstone in a cheap jewelry shop or a craft store crystal display, it was almost certainly white moonstone. This is the most common variety by a huge margin, and it's what most people picture when they hear the word.

White moonstone has a milky, translucent body with white or silvery adularescence. The glow tends to be diffuse rather than sharp — more like moonlight through clouds than a focused beam. India produces enormous quantities of white moonstone, particularly from the states of Andhra Pradesh and Odisha, which keeps prices low and supply steady.

Price range: Roughly $3 to $15 per carat for decent quality. Large, gem-grade pieces with strong adularescence can push higher, but the average tumbled stone or bead strand is very affordable.

White moonstone is the variety most likely to disappoint if you've seen photos of stunning blue specimens online. The adularescence is often weak or patchy, especially in mass-produced jewelry. But a really good white moonstone with a sharp, centered glow is genuinely beautiful — it's just harder to find than the mediocre stuff.

Blue Moonstone — The Collector's Grail

Blue moonstone is where things get serious. Instead of a white or silvery glow, a quality blue moonstone produces a distinct blue sheen that floats across the surface as you move the stone. The best specimens show a bright, almost electric blue that appears and disappears with each tilt — collectors call this a "floating blue" and it's what drives prices into the stratosphere.

The blue color comes from the extremely thin layering within the feldspar. Light interference at those nanoscale thicknesses selectively scatters blue wavelengths while letting others pass through. It's the same basic physics that creates the iridescent colors on a soap bubble, just locked inside a mineral.

India remains the primary source, with the state of Bihar producing some of the finest specimens. Myanmar (Burma) has historically yielded exceptional blue moonstones with exceptional clarity, though political instability and export restrictions have made Burmese material increasingly scarce. Sri Lanka also produces blue moonstones, though they tend toward a softer, more subtle blue compared to the vivid Indian stones.

Price range: $15 to $80 per carat for good to excellent quality. Top-grade stones with a centered, vivid blue sheen and near-colorless body can exceed $100 per carat, and investment-grade Burmese pieces have sold for significantly more at auction.

Blue moonstone is the only variety that most serious collectors consider a genuine investment. Demand consistently outstrips supply for high-quality material, and prices have been climbing steadily for the past decade. If you're buying moonstone as something more than a casual hobby, this is where you should focus.

Rainbow Moonstone — The Identity Crisis

Here's where the controversy lives. Rainbow moonstone displays flashes of multiple colors — blue, purple, green, gold, sometimes pink — that shimmer across the surface as you rotate it. It's undeniably striking and extremely popular in jewelry and crystal healing communities.

The problem? Most gemologists argue that rainbow moonstone isn't actually moonstone at all.

The dominant mineral in rainbow moonstone is labradorite, a sodium-calcium feldspar, rather than orthoclase (potassium feldspar). Labradorite is known for producing a similar internal play of color called labradorescence, which is the same phenomenon that makes the famous spectrolite from Finland so spectacular. When labradorite is translucent enough and the labradorescence is soft rather than bold, it gets marketed as "rainbow moonstone."

So is it moonstone or isn't it? The Gemological Institute of America (GIA) classifies rainbow moonstone as a variety of labradorite, not orthoclase moonstone. The Federal Trade Commission doesn't have a specific ruling on it. Most sellers call it moonstone because that's what sells. Most mineralogists wince when they hear that.

Personally, I think the debate matters less than the stone itself. Rainbow moonstone looks fantastic, and the multi-color flash is something no other "true" moonstone can replicate. Just know what you're actually buying.

Price range: $5 to $25 per carat. Despite the visual appeal, rainbow moonstone is relatively affordable because labradorite is abundant. Madagascar and India are the main sources.

Peach Moonstone — The Warm Alternative

Peach moonstone ranges from a very pale, barely-there pink to a deep, almost orange-tan color. The body color comes from trace amounts of iron that were present during formation. The adularescence is usually white or silvery against the peach background, creating a warm, gentle look that a lot of people find more approachable than the cooler white and blue varieties.

The warmth of peach moonstone has made it especially popular in the crystal healing community, where it's associated with emotional balance and feminine energy (whether or not you buy into that stuff, it's useful context for understanding why demand exists). It's also frequently used in bohemian-style jewelry designs where the earthy tone fits the aesthetic.

India produces most commercial peach moonstone, and quality varies enormously. The best pieces have a uniform peach body color with bright, centered adularescence. Lower-quality material can look muddy or have inconsistent coloring with weak or nonexistent glow.

Price range: $5 to $20 per carat. Similar to white moonstone in terms of affordability, though exceptionally clean, well-colored pieces can command a small premium.

Gray Moonstone — The Underrated One

Gray moonstone is the least common variety you'll encounter in mainstream markets, and that's a shame because some of the best adularescence I've ever seen has been on gray stones. The gray body color is usually caused by microscopic inclusions or very fine-grained mineral impurities, and against that darker background, the floating sheen becomes dramatically more visible.

A gray moonstone with strong blue adularescence can look almost like a poor man's blue moonstone at a fraction of the price. The dark background provides contrast that makes the glow pop in a way that transparent or white stones can't match. Some of the most impressive "rainbow" effects also appear on gray material.

The downside is availability. Gray moonstone isn't mined in the same quantities as white or rainbow, and it's often mixed in with other feldspar material that gets sorted and sold as generic "moonstone" without variety distinction. Finding a deliberate, well-cut gray moonstone requires looking at specialist dealers rather than mass-market suppliers.

Price range: $8 to $30 per carat. Scarcity drives the price up compared to white and peach, though it still falls well below blue moonstone territory.

The Labradorite Question: Does Rainbow Moonstone Belong?

This deserves its own section because it comes up constantly in collecting communities and nobody seems fully satisfied with the answer.

The argument for calling it moonstone goes like this: it looks like moonstone, it's sold as moonstone, it's used in all the same jewelry and metaphysical applications as moonstone, and the internal light play is similar enough that the average person can't tell the difference. The mineralogical distinction is technically accurate but practically irrelevant to most buyers.

The argument against goes like this: it's a different mineral (labradorite vs. orthoclase), it forms under different geological conditions, the light play mechanism is technically different (labradorescence vs. adularescence), and calling it "moonstone" is misleading. Imagine selling white topaz as "white diamond" and you get the idea, though the deception here is less extreme.

The GIA has landed firmly on the "not really moonstone" side, classifying rainbow moonstone as a trade name for translucent labradorite. Most academic mineralogists agree. But the jewelry industry and crystal market show no signs of dropping the name, because "translucent labradorite with soft labradorescence" doesn't exactly roll off the tongue.

My take? Be honest about what it is. If you're selling it, call it "rainbow moonstone (labradorite)" or "rainbow feldspar." If you're buying it, know that you're getting labradorite and evaluate it on those terms. It's a beautiful stone regardless of what label gets slapped on it.

How to Actually Choose a Good Moonstone

Most buying advice for moonstone is either too vague ("look for good adularescence") or too technical ("measure the interference layer thickness with a spectrometer"). Here's what actually matters when you're holding a stone or looking at a listing:

Tilt it and watch the glow move. This is the single most important test. A quality moonstone's adularescence should be visible across a range of angles — you shouldn't have to hunt for the "sweet spot" where the glow appears. The sheen should glide smoothly across the surface as you rotate the stone, not blink on and off abruptly.

Check for a centered sheen. The best moonstones have their adularescence concentrated in the center of the cabochon, creating a distinct "eye" that seems to follow you. Stones where the glow is only visible at the edges or is unevenly distributed are lower quality.

Look at the body color. For blue moonstone specifically, a near-colorless or very lightly tinted body is ideal because it provides maximum contrast with the blue sheen. Cloudy or heavily included material that obscures the adularescence should be avoided unless you're going for a specific aesthetic.

Examine under direct light. Not all light is equal. LED lighting and direct sunlight will reveal adularescence that might be invisible under fluorescent office lighting. If you're buying in person, take the stone near a window or use your phone flashlight. If buying online, look for photos or videos taken under strong, direct light — sellers who only show their stones in dim lighting are usually hiding something.

Check for cracks and inclusions. Moonstone has two directions of perfect cleavage, which means it wants to break along flat planes. Small internal fractures are common and acceptable in lower-priced material, but any crack that reaches the surface will eventually propagate and destroy the stone. Run your fingernail along the surface — if it catches on anything, pass.

Caring for Moonstone

At 6 to 6.5 on the Mohs scale, moonstone is durable enough for occasional wear in most jewelry settings, but it's not tough enough for daily abuse. Here's what you need to know:

Avoid wearing moonstone rings on your dominant hand or during activities that involve impact — gym workouts, dishwashing, yard work. The stone can chip or cleave along its natural planes if struck hard enough. A protective bezel setting helps enormously if you do want to wear one regularly.

Clean moonstone with warm, soapy water and a soft brush. Ultrasonic cleaners are risky — the vibrations can worsen existing internal fractures. Steam cleaning is flat-out dangerous given the potential for thermal shock. Skip both and use the old-fashioned method.

Store moonstone separately from harder stones like quartz, sapphire, and diamond. A jumbled jewelry box where everything rubs together will put scratches on your moonstone surprisingly fast. A soft pouch or individual compartment in a jewelry case is the way to go.

Avoid prolonged exposure to direct sunlight if possible. While moonstone doesn't fade the way some colored stones (amethyst, kunzite) do, the feldspar structure can develop small stress fractures over time with repeated heating and cooling cycles. It's not an emergency, just a good habit.

Which Moonstone Is Worth Your Money?

If I had to give straightforward advice rather than the diplomatic "it depends" answer: blue moonstone is the only variety I'd recommend as a serious purchase. The combination of genuine scarcity, consistent demand, and genuinely stunning visual appeal means that a high-quality blue moonstone purchased today will almost certainly be worth more in five years. The price trajectory over the past decade supports this — quality blue material has roughly tripled in price, while other varieties have remained relatively stable or even dropped due to increased supply.

That said, "worth buying" and "worth buying for investment" are different things. Rainbow moonstone makes absolutely gorgeous jewelry at a very accessible price point, and the multi-color flash is genuinely hard to replicate with any other stone. White and peach moonstones are perfect for casual pieces, gifts, or crystal grids where you want the moonstone aesthetic without the premium price tag. Gray moonstone is worth seeking out if you want something unusual — the dark background really does make the adularescence pop, and you'll have a stone that most other collectors don't.

The only variety I'd actively caution against overpaying for is rainbow moonstone marketed as "premium" or "investment grade." Since it's labradorite, it doesn't have the same supply constraints as true blue moonstone, and there's no indication that prices will appreciate significantly. Buy it because it's pretty and you enjoy wearing it, not because someone on Instagram told you it's the next big thing.

At the end of the day, moonstone in any variety is one of the more affordable gemstones you can collect. Even the best blue specimens cost a fraction of what you'd pay for comparable-quality sapphire or tourmaline. That accessibility is part of what makes it such a rewarding stone to explore — you can build a genuinely impressive collection across all five varieties without spending a fortune. Just know what you're looking at, pay fair prices, and keep them away from the diamond ring in your jewelry box.