Seylan Gems & Jewelry
Peridot is the gem form of olivine. The yellow-green color comes from iron in the mineral itself, so it is not a treated colorless stone with a coating. You can often see facet edges doubled when you look through the table with a lens.
Specifications
Typical published ranges used in gemology. Specific gravity below matches our carat calculator default where applicable. (SG 3.34)
| Hardness (Mohs) | 6.5–7 |
|---|---|
| Refractive index | About 1.654–1.690 |
| Optic character | Doubly refractive, birefringence about 0.036 |
| Specific gravity | About 3.34 |
| Chemistry | Olivine, an iron magnesium silicate |
| Lustre | Vitreous, sometimes oily |
A bright yellow-green, not so dark that it looks olive-black and not so yellow that it looks like glass. Doubling of the pavilion facets is a feature of the mineral. It is not a crack.
Peridot can be confused with sinhalite or with green zircon at a glance. Refractive index and density separate them. If a listing says peridot, that is the claim to hold us to.
Hardness 6.5–7 and easy cleavage mean a ring should have a protected setting. Acid and some household cleaners can etch the surface. Skip the ultrasonic if the stone is included. A pendant is simpler if you do not want to think about the stone every day.
The green is idiochromatic: iron in the formula causes it. The usual issue is wear, not a dye. Still read the listing for any coating or assembled stone, which would be a different product.
Peridot’s birefringence is high. A lens through the table often shows two edges. That is normal.
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