* pearl gemstone
Pearl: identification, value, and how to spot a fake
Organic gem. Akoya (Japanese saltwater, small), South Sea (Australian/Indonesian/Philippine, large, white-gold), Tahitian (French Polynesian, black), and freshwater (China, varied) are the main types. Mostly cultured today; natural pearls are extraordinarily rare and valuable.
Published May 30, 2026
Quick facts
- Mineral family
- pearl
- Chemical formula
- CaCO3 (aragonite) + organic conchiolin
- Mohs hardness
- 2.5–4.5
- Refractive index
- 1.53–1.685
- Specific gravity
- 2.6–2.85
- Crystal system
- orthorhombic (aragonite)
- Luster
- pearly
- Birthstone month
- June
Colors
Pearl is found in white, cream, pink, black, gold, blue, iridescent. The body color, its saturation, and how evenly it spreads through the stone are among the strongest drivers of value.
How to tell real from imitation
No single test settles it, but a few grounded checks quickly narrow things down for Pearl. Hardness, brilliance, and the list of stones it is commonly confused with all give you something concrete to look for.
- Scratch resistance: genuine Pearl sits at Mohs 2.5–4.5, so it should resist scratching from softer materials — a stone that mars far too easily is suspect.
- Brilliance & luster: Pearl shows a pearly luster and a refractive index of 1.53–1.685; imitations often look glassier or flatter under the same light.
- Density: a real Pearl has a specific gravity near 2.6–2.85, so it feels heavier or lighter in the hand than many look-alikes of the same size.
- Commonly imitated by: glass pearls (Majorica), shell pearls, plastic pearls. If a deal looks too good, suspect one of these substitutes first.
- Fast first read: photograph the stone in the Jewelry Identifier app to estimate the gemstone and its likely value range, then confirm anything important with a gemological lab.
Common treatments
- bleaching
- dyeing
- irradiation
Treatments are routine for many Pearl stones, but they materially affect value and should always be disclosed — an untreated, lab-certified stone commands a clear premium over a treated one.
What to know about Pearl
Organic gem. Akoya (Japanese saltwater, small), South Sea (Australian/Indonesian/Philippine, large, white-gold), Tahitian (French Polynesian, black), and freshwater (China, varied) are the main types. Mostly cultured today; natural pearls are extraordinarily rare and valuable.
Sources
* Frequently asked
FAQ
- Q. Is Pearl hard enough for everyday rings?
- A. Not ideally. At a Mohs hardness of 2.5–4.5, Pearl is soft enough to scratch with everyday wear, so it is better suited to earrings, pendants, or occasional-wear rings with protective settings.
- Q. How can I tell Pearl from glass pearls (Majorica)?
- A. Pearl and glass pearls (Majorica) can look alike to the naked eye, but they differ in measurable properties — refractive index (1.53–1.685 for Pearl), specific gravity (2.6–2.85), and hardness (Mohs 2.5–4.5). A gemologist confirms the distinction with a refractometer and loupe; the Jewelry Identifier app gives a fast first read from a photo.
- Q. Does Pearl come in colors other than white?
- A. Yes. Pearl occurs in white, cream, pink, black, gold, blue, iridescent. Color is driven by trace elements and treatment history, and it is one of the biggest factors in a stone's value.
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