How to tell if a peridot is real
This page lists clear, low-risk checks you can do at home and what to expect from a professional test. Peridot is the gem name for gem-quality olivine, and several visual and simple physical tests help separate a real peridot from glass or other green stones.
Published
Quick facts
- Hardness
- 6.5 to 7 on the Mohs scale
- Mineral
- gem-quality olivine
Quick visual checks
Look at the stone in daylight and under a bright lamp. Real peridot displays a clear yellow-green to olive-green color; it usually leans toward yellow-green rather than pure green or blue-green. Check the surface for obvious bubbles or flow lines—those are signs of glass. Note whether the color looks uniform: many simulants show zoned or painted color. Compare the stone to known examples of other green gems like tourmaline or garnet to spot hue differences.
Inspect with a loupe
Use a 10× jeweler's loupe to look for internal features. Natural peridot commonly has small mineral crystal inclusions or tiny feather-like fissures; it rarely is perfectly flawless. Gas bubbles, swirl patterns, or curved striae point to glass or a synthetic. Sharp, angular crystals inside the stone are more consistent with natural peridot than with most glass imitations.
Hardness and scratch considerations
Peridot rates 6.5 to 7 on the Mohs scale, so it will resist scratching by materials softer than that and can be scratched by harder substances. A controlled scratch test can damage your jewelry, so do not perform aggressive tests. If you must try a simple check, use a piece of window glass as a reference: peridot can often scratch glass, but glass and some simulants cannot. When in doubt, skip home scratching and ask a jeweler to test the piece.
Non-destructive tests a jeweler can do
A trained jeweler can use tools a consumer typically does not have: a refractometer to measure refractive index, a polariscope to check optical character, and a specific-gravity balance. These tests can separate peridot from common simulants such as green glass, green cubic zirconia, or other green gems. Laboratory testing (gemological report) provides a definitive identification and documents treatments or enhancements.
When to get professional help and what to expect
If the stone is valuable or mounted in important jewellery, stop after the non-destructive checks and seek a professional opinion. A gem lab will report identity, whether the stone is natural or synthetic, and note any treatments. Bring clean, unpolished photos and any purchase paperwork. The professional will perform instruments-based tests that do not rely on guessing from appearance.
Quick summary and tools you can use
Summary: peridot is gem-quality olivine; check color, look for natural inclusions with a loupe, avoid aggressive home scratch tests (remember 6.5 to 7 on the Mohs scale), and consult a jeweler for instrument testing. If you want a quick second opinion from a mobile tool, try Jewelry Identifier.
Common questions
- Can peridot be lab-grown or synthetic?
- Synthetic peridot is uncommon. Most imitations are glass or other green gems. Proper instruments or a gem lab report are the reliable way to confirm whether a stone is a natural peridot or an imitation.
- How do I tell peridot from green tourmaline or green garnet?
- Compare color and clarity: peridot tends to show a yellowish-green tone, whereas tourmaline and garnet often show deeper or bluer greens. Use a loupe to inspect inclusions—each mineral has different typical inclusions—and seek a refractometer or professional test for a definitive separation.