Comparison · Semi-Precious Stones vs Organic Gems
Moonstone vs Pearl
Moonstone and Pearl are easy to confuse. Moonstone is harder (Mohs 6) than Pearl (Mohs 3), so Moonstone will scratch Pearl and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Moonstone and Pearl
- Moonstone is harder (Mohs 6) than Pearl (Mohs 3), so Moonstone will scratch Pearl and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Luster is different: Moonstone is vitreous while Pearl is pearly.
- Hold a thin edge to the light: Moonstone is translucent, Pearl is opaque.
- They overlap in white and pink, but Moonstone also comes in gray and blue and Pearl also comes in black and yellow.
- Well-formed crystals give it away: Moonstone is monoclinic, Pearl is orthorhombic.
Moonstone vs Pearl properties
| Property | Moonstone | Pearl |
|---|---|---|
| Type | Semi-Precious Stones | Organic Gems |
| Mohs hardness | 6 | 3 |
| Luster | vitreous | pearly |
| Streak | White | White |
| Transparency | translucent | opaque |
| Specific gravity | 2.6 | 2.7 |
| Crystal system | monoclinic | orthorhombic |
| Common colors | White, Gray, Peach, Blue sheen | White, Cream, Pink, Black, Gold |
| Rarity | uncommon | uncommon |
| Typical specimen value | $10–$500+ | $50–$100000+ |
Which is more valuable?
Pearl is usually the more valuable of the two: a typical collector specimen runs about $500 against $50 for Moonstone, and premium Pearl can reach $100000 or more.
About Moonstone
Moonstone is a feldspar mineral known for its adularescence—a billowy blue-white light that moves across the surface like moonlight on water.
About Pearl
Pearls are organic gems formed inside mollusks. Natural pearls are extremely rare; most pearls today are cultured by inserting a nucleus into the mollusk.
Moonstone vs Pearl FAQ
Is Moonstone the same as Pearl?
No. Moonstone is a semi-precious stone while Pearl is a organic gem. Moonstone is harder (Mohs 6) than Pearl (Mohs 3), so Moonstone will scratch Pearl and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
How can you tell Moonstone from Pearl?
Moonstone is harder (Mohs 6) than Pearl (Mohs 3), so Moonstone will scratch Pearl and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Luster is different: Moonstone is vitreous while Pearl is pearly. Hold a thin edge to the light: Moonstone is translucent, Pearl is opaque.
Which is harder, Moonstone or Pearl?
Moonstone is harder: Mohs 6 against Mohs 3 for Pearl.
Which is more valuable, Moonstone or Pearl?
Pearl is usually the more valuable of the two: a typical collector specimen runs about $500 against $50 for Moonstone, and premium Pearl can reach $100000 or more.
