ANDREA LI

LIMITED COLLECTIONS

Moonstone vs PearlGemstone Guide

A model with voluminous strawberry-blonde curls in a strapless ivory gown, wearing a multi-strand white necklace with a cascading cluster at the center

Interactive · Tap a marker

Pearl · Moonstone

The same glow, two different stones

They are mistaken for each other all the time. Tap a marker to see what gives each its light, and how to tell them apart.

Pearl

  1. 1

    Luster & Orient. Luster is the soft surface sheen, light bouncing off the layered nacre. Orient is the rainbow play that seems to dance on or just beneath that surface, like oil on water. Together they make a pearl's glow.

  2. 2

    Nacre. A pearl is organic. A mollusk coats an irritant in layer after layer of nacre until a pearl forms, so no two are ever identical.

  3. 3

    Opaque. Light does not pass through a pearl. The glow is all surface, which is part of why it reads as warm and solid.

Moonstone

  1. 1

    Adularescence. The blue-white light floats beneath the surface and drifts as you tilt the stone. No pearl does this. It is the fastest way to tell them apart.

  2. 2

    Feldspar. Moonstone is a mineral, formed in the earth. Its glow comes from light scattering between microscopic layers inside the crystal.

  3. 3

    Translucent. Light passes into the stone, which is why the glow looks like it is hovering just inside rather than sitting on top.

Illustrative, not a photograph.

Moonstone

The Rainbow Moonstone Quality Guide

Unlike diamonds with rigid laboratory certifications, gemstone grading for rainbow moonstone (technically a transparent variety of labradorite) relies on visual quality tiers defined by clarity, flash intensity, and cut.

AAAA grade rainbow moonstone cabochon with intense glowing blue adularescence

AAAA / AAA (Extra / High Grade)

Aura-quality

  • Exceptional, crystal-clear transparency
  • Intense, glowing blue and rainbow flash visible from any angle
  • Zero or very few internal inclusions
  • Expertly cut symmetrical cabochons with high polish
AA and A commercial grade rainbow moonstone cabochons with scattered blue flash and black speck inclusions

AA / A (Commercial Grade)

  • Translucent to semi-opaque body
  • Moderate shimmer or scattered color flashes
  • Noticeable internal flaws or speck inclusions
B and AB craft grade rainbow moonstone, opaque milky tumbled stones with weak adularescence

B / AB (Lower / Craft Grade)

  • Opaque, milky, or grayish body
  • Dull, weak, or completely missing adularescence
  • Rough cuts, asymmetrical domes, prominent surface flaws

Core Grading Factors

Light rays passing through a transparent rainbow moonstone, showing how a clearer body raises value

1. Transparency (Clarity)

The clearer the background body, the higher the value.

Three moonstone spheres comparing adularescence strength: low silvery sheen, high neon blue flash, and highest full-spectrum rainbow flash

2. Adularescence (Flash Quality)

Deep neon blue, electric violet, or full-spectrum rainbow command the highest prices. Weak sheens rank lower.

A high symmetrical moonstone cabochon dome next to a flat lopsided cut, showing how dome shape controls the floating light effect

3. Cut

A smooth, properly proportioned dome maximizes the floating light effect. A flat or lopsided cut traps light.

Gemstone Profile

Pearl vs Moonstone

Pearl

Organic Gem

Moonstone

Mineral Gem

Formation

Layers of nacre build around an irritant inside a living mollusk, slowly, into a cultured or natural pearl.

A feldspar mineral that forms and grows within rock over long stretches of geological time.

Composition

Nacre (aragonite and conchiolin). An organic origin, grown by a living creature.

Feldspar (orthoclase and albite). A mineral formation, grown in stone.

Hardness (Mohs Scale)

12345678910
2.5 to 4.5 Soft and delicate6 to 6.5 Medium hardness

Luster & Phenomena

A group of pearls: South Sea, Tahitian, freshwater, and Akoya
Surface sheen. Light reflects off the surface as luster, and through the sub-surface layers as orient.
A group of moonstones: rainbow, peach, gray, and blue sheen
Adularescence, also called schiller. Light scatters between microscopic layers into a floating, ethereal glow.

Varieties

  • Akoya pearlAkoyaClassic white and cream.
  • South Sea pearlSouth SeaLuminous white and golden.
  • Tahitian pearlTahitianPeacock and black.
  • Freshwater pearlFreshwaterMany colors and shapes.
  • Blue sheen moonstoneBlue SheenA floating blue glow.
  • Rainbow moonstoneRainbowMulti-color flash, a labradorite.
  • Peach moonstonePeachWarm, soft tones.
  • Gray moonstoneGrayCool, subtle glow.

Traditional symbolism

Purity, wisdom, and new beginnings.

Intuition, calm, and connection.

This stone is part of my pastel gemstone collection, one-of-a-kind pieces handcrafted in Denver.

As featured in

GMARO Magazine

Pearl and moonstone jewelry by Andrea Li, as it ran.

Photography
Randi Rheaa
Hair
Charlie Price
Makeup
Bella, Beauty by Bellalicious
Furs
Atsaga’s Fur and Leather Designs
Models
Donna Baldwin Agency
Jewelry
Andrea Li
GMARO Magazine page: a full-length editorial portrait of a model in a floor-length cream fur and a white curly headpiece, wearing jewelry by Andrea Li
GMARO Magazine page: a model in a cream fur coat and white headpiece against a floral wall, wearing a pearl necklace by Andrea Li
Pearl
GMARO Magazine page: a model in pink fur and a white curly headpiece in a gray studio, wearing moonstone jewelry by Andrea Li
Moonstone
GMARO Magazine page: a model seen from behind against a floral wall, a moonstone necklace by Andrea Li falling down her back
Moonstone

A pearl and a moonstone can sit side by side and look like the same stone. Both glow with a soft, low light that seems to come from somewhere inside. People mix them up constantly. But they are not even close to the same thing: one is made by an animal, the other is made by the earth, and once you know where each one's light comes from, you will never confuse them again.

I set both. Pearls are one of the two stones in nearly every piece I make, and moonstone has carried whole collections. Here is how I tell them apart at the bench, and how you can tell them apart in your hand.

At a glance

PearlMoonstone
What it isOrganic. Made by a mollusk.Mineral. A feldspar, formed in the earth.
The glowLuster (surface sheen) plus orient (a faint rainbow play)Adularescence (a blue-white light that floats and drifts)
TransparencyOpaque. Light does not pass through.Translucent. Light passes in and scatters.
Hardness (Mohs)2.5 to 4.5. Soft.6 to 6.5. Harder, but it cleaves.
ColorsWhite, cream, pink, gold, gray, blackColorless to white body, with a blue or rainbow sheen
SourceMollusks, farmed and wild, worldwideSri Lanka, India, Madagascar, and more
BirthstoneJuneJune
CareSoft, porous, hates acid and heat. Last on, first off.Tougher surface, but brittle. Protect from knocks.

The glow is the giveaway

If you only learn one thing, learn this: look at where the light lives.

Where the light lives. On a pearl, light bounces off the surface as luster, with orient just beneath it, and none passes through. In a moonstone, light passes in and scatters between thin layers, so the glow hovers just under the surface.

On a pearl, the light sits on the surface. That soft, satiny shine is called luster, and it is just light bouncing off the smooth, layered nacre the mollusk builds up. On a good pearl you may also see orient, the faint rainbow play that seems to dance on or just beneath the surface, like the colors in a film of oil on water. Luster is the sheen; orient is the rainbow. Together they make a pearl's glow, and all of it reads as warm and solid, because no light passes through.

On a moonstone, the light comes from inside. That floating blue-white glow is called adularescence, and it drifts across the stone as you tilt it. It happens because moonstone is built from microscopically thin layers, and light scatters between them, so the glow looks like it is hovering just under the surface rather than sitting on top. No pearl does this. The moment you see light move as you tilt the stone, you are holding a moonstone.

What each one actually is

A pearl is organic. It is one of the few gems made by a living creature. A mollusk coats an irritant inside its shell with layer after layer of nacre, the same material that lines the shell, until a pearl forms. That is why no two pearls are ever truly identical, and why pearls are soft: nacre is delicate.

A moonstone is a mineral. It belongs to the feldspar family, the most common mineral group in the earth's crust, and it forms as two kinds of feldspar separate into thin, alternating layers as the stone cools. Those layers are what scatter the light into that blue glow. It is harder than a pearl, but feldspar cleaves, meaning it can split cleanly along its internal planes if it takes a sharp knock.

Durability and care, from the bench

This is where setting them teaches you the difference fast. A pearl is soft and porous, so it has to be protected from heat, from acids, even from perfume and hairspray. A moonstone has a tougher surface but it is brittle, so the danger is a sharp impact rather than a scratch.

For the wearer, the rule of thumb is the same for both, for opposite reasons. Pearls go on last and come off first so they never meet perfume or lotion. Moonstones can take daily wear but should be kept from hard knocks against other jewelry. To clean either one, skip the ultrasonic cleaner and skip heat. Neither stone tolerates them, and honestly I would not put any of my pieces through them. Warm water, a soft toothbrush, and a drop of Dawn lift away the oils and dust that dull a piece, and the polishing cloth tucked into every order brings the metal back to life (oxidized silver should not be polished).

Which one is for you

Here is the happy accident: both pearl and moonstone are June birthstones, so whichever speaks to you, you are covered.

Reach for a pearl if you love a warm, classic, dressed-up glow, the kind of light that has meant elegance for centuries. Reach for a moonstone if you are drawn to something cooler, more mysterious, a little otherworldly, with that blue light that moves when you do. One is the moon's reflection on calm water; the other is the moon itself.

The four pearl types, side by side

Saltwater types are named for where they are farmed. Nearly all freshwater pearls on the market come from China. Nearly every pearl sold today is cultured; natural pearls are rare.

TypeOysterKnown forStrand price, retail
Akoya Pinctada fucata martensii The first pearl cultured commercially. Smaller, classically round, white and metallic shades. $300 to $10,000 and above
South Sea Pinctada maxima Size, and exceptional golden color. $1,000 to $100,000 and above
Tahitian Pinctada margaritifera, the black lipped oyster Exotic dark colors, and baroque shapes. $500 to $25,000 and above
Freshwater Freshwater mollusk, which can carry up to about 50 pearls at once A vast range of shapes, sizes and colors. Round ones look almost identical to Akoya at a lower price. $50 to $2,000

Saltwater pearls grow around a bead for roughly ten months to two years, with only one or two pearls per oyster at a time. That time, and so few pearls per oyster, is why they cost more.

Surface characteristics, and the three that are not flaws

Anything with organic origins carries imperfection. Most surface marks are cosmetic and lower the grade. Some are growth characteristics that do not, and one of them is evidence of quality.

CharacteristicWhat it isLowers the grade
WrinklesUneven nacre formation. Expected, and often desirable, on pearls nucleated to be non round.Yes, on round pearls
SpotsSlight variations of color.Yes
AbrasionsScratches or scuffs that interrupt the luster.Yes
Dents and divotsIndentations in the nacre, varying in size.Yes
MottlingA light plating pattern formed inside the oyster.No. It indicates a thick nacre layer.
Kobs and tipsGrowth characteristics.No, unless chipped, which affects durability.
CirclesA growth characteristic that gives a distinctive banded look.No.

How rare a fine pearl actually is

StageShare
Nucleated oysters that survive to bear a pearlAbout 50 percent
Of those, pearls that are marketableAbout 20 percent
Nucleated oysters yielding fine gem qualityFewer than 5 percent
The grade above AAAHanadama, certified by the Pearl Science Laboratory in Tokyo

These are figures the trade repeats rather than peer reviewed research, and pearl grading itself is not standardized, so treat every tier on every chart as one seller's opinion until you have looked at the pearl.

From the bench · Andrea Li

The give that keeps them whole

A note from Andrea Li, who sets both pearl and moonstone by hand in her Denver studio.

On the back of my work there is a weave, a web of wire I was told for years to hide and never could. It is the truest part of what I make. Every strand is held under tension, and the whole thing holds precisely because each one gives a little instead of snapping. Setting a pearl beside a moonstone taught me that lesson twice over.

Strength was never rigidity. It is knowing where to give.

A pearl is soft, Mohs two and a half, built of thousands of aragonite platelets bound in a protein called conchiolin, closer to structural plywood than a rigid crystal. That give is its whole gift. Across thousands of pearls, not one has ever broken on me, because when I widen a hole and seat the pearl on a peg it flexes and absorbs the pressure instead of fracturing. A hard, brittle gem does the opposite, cleaving along a hidden plane the moment you ask too much of it.

Moonstone teaches the same truth from the other side. It looks soft and lit from within, yet it is brittle, so I have to give on its behalf, working slow and cool. Even its glow is a kind of give: that blue drift, called adularescence, is only light slipping between microscopic layers inside the stone. Rigid things shatter. The ones that yield, a little, in the right place, are the ones that last. That is the throughline held in the weave on the back of every piece I make: pressure met with give, and turned into something more beautiful for it.


From the bench · Andrea Li

The tells I use to know them apart in a second

A note from Andrea Li, who sets both stones by hand in her Denver studio.

After years of setting both, I do not have to think about it anymore. These are the four things I read, side by side.

PearlMoonstone
Where the light livesOn the surface: a satiny luster, sometimes a faint rainbow orient drifting over itInside: a blue-white glow that floats and moves as you tilt the stone (adularescence)
Light through itOpaque, no light passes throughTranslucent, light passes in and scatters
What it isOrganic, made by a mollusk in layers of nacreA mineral, a feldspar formed in the earth
How it behaves at my benchSoft but forgiving. A pearl has never broken on me.Harder, but brittle. It can cleave at the drill hole if it is stressed.

That last line is the one no chart will tell you. A pearl rates only 2.5 to 4.5 for hardness, far softer than moonstone, yet its organic, layered structure absorbs stress instead of fracturing. Moonstone is harder, but it has cleavage planes, and a hard knock or too much tension where the hole is drilled will split it clean. Softer is not always more fragile.

Frequently asked questions

Is moonstone the same as a pearl?

No. A pearl is organic, made by a mollusk, and opaque. A moonstone is a mineral in the feldspar family, formed in the earth, and translucent. They can look similar because both have a soft inner-seeming glow, but the glow works in completely different ways.

How can I tell a pearl from a moonstone quickly?

Tilt it toward the light. If the glow stays put on the surface as a soft sheen, it is a pearl. If a blue-white light floats and drifts across the stone as you move it, it is a moonstone. Pearls are also opaque, while moonstone lets light pass through.

Is moonstone the same as mother-of-pearl?

No. Mother-of-pearl is nacre, the iridescent material that lines the inside of a mollusk's shell, the same material a pearl is built from. Like a pearl, it is organic and opaque, and its shimmer sits on the surface. A moonstone is a feldspar mineral formed in the earth, and its blue-white glow, adularescence, floats beneath the surface and drifts as you tilt the stone.

What is the floating blue light in a moonstone called?

Adularescence. It is caused by light scattering between microscopically thin layers inside the stone, which makes the glow appear to hover just below the surface and drift as the stone is tilted.

Are pearl and moonstone both June birthstones?

Yes. June has more than one birthstone, and both pearl and moonstone are among them, along with alexandrite. So either stone is a fitting choice for a June birthday.

Which is more durable, pearl or moonstone?

Moonstone is harder on the Mohs scale (about 6 to 6.5) than a pearl (about 2.5 to 4.5), so it resists scratching better. But moonstone is brittle and can chip or cleave from a sharp knock, while a pearl's main enemies are scratches, acids, heat, and chemicals. Both are best treated gently.

How do you clean pearl and moonstone jewelry?

Skip the ultrasonic cleaner and skip heat. Neither stone tolerates them. The safest method for both is warm water, a soft toothbrush, and a drop of Dawn dish soap to remove the oils and dust that dull a piece, then a Sunshine polishing cloth on the metal parts to bring them back. Oxidized silver should not be polished. Put pearls on last and take them off first so they never meet perfume, lotion, or hairspray.

Discover

Jewelry that feels like you.

Two minutes. The quiz tells me how you want jewelry to feel in your life, and the messages that follow walk you through pieces I think you'll love.

Take the Style Quiz

Two minutes. I take it from there.

Stay Close

Love what you see? Keep finding us.

Google now lets you choose your favorite sources so they show up labeled in AI search answers. If you enjoy discovering handcrafted gemstone jewelry here, add Andrea Li Designs and we'll be easier to find next time you search.

Add Andrea Li Designs as a Preferred Source

One click. Works across Google Search, AI Overviews, and AI Mode.