Gemstones
How to Tell if a Gemstone is Real: Certificates, Tests & Red Flags
6 min read · Updated 2026-07-11
Whether you are buying an astrological gemstone or a fine jewel, the same question decides everything: is it real? For a stone meant to carry planetary influence, authenticity is not just about value — a synthetic or simulant is not considered to carry the same effect. Here is how to be sure.
The certificate is everything
A report from an independent gemmological laboratory is the single reliable proof. Look for IGI, GRS, GIA or a comparably reputed lab — and check that the certificate is from the lab, not printed by the seller. It should state the species, whether the stone is natural or synthetic, its origin where relevant, and any treatment.
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From the Treasury
Yellow Sapphire — Pukhraj
₹58,000
The four things you might be sold
- Natural: mined, formed in the earth — what Jyotish requires.
- Synthetic: real chemical composition but grown in a lab — looks identical, but not considered astrologically equivalent.
- Simulant: an imitation — glass, cubic zirconia, or a cheaper stone standing in for the real one.
- Treated: natural but enhanced (heated, oiled, diffused, glass-filled). Some treatment is normal and accepted if disclosed; undisclosed heavy treatment is not.
Indicative home checks (not proof)
- Inclusions: natural stones usually have tiny internal inclusions; flawless perfection at a low price suggests synthetic or glass.
- Temperature: real gemstones and quartz stay cool to the touch; glass warms quickly.
- Hardness: sapphires, rubies and emeralds are hard and resist scratching; softer imitations scratch easily.
- Bubbles: round gas bubbles inside a 'gem' usually mean glass.
Red flags of a fake
- A price far below market for the size and colour claimed.
- A large stone with intense, even colour and zero inclusions.
- An in-house or unbranded 'certificate', or refusal to provide independent lab papers.
- Vague answers about origin and treatment.
Frequently Asked
- How can I tell if a gemstone is real?
- The only reliable proof is an independent laboratory certificate (IGI, GRS, GIA) stating the stone is natural and disclosing treatment. Home tests are indicative but not conclusive.
- Is a lab-grown gemstone considered real?
- A synthetic stone is chemically real but grown in a lab, not the earth. For Jyotish purposes only natural gemstones are considered to carry planetary influence.
- Are treated gemstones fake?
- No — many natural stones are treated (heated or oiled) and this is accepted in the trade, provided the treatment is disclosed on an independent certificate. Undisclosed heavy treatment is the problem.
- What is the biggest sign of a fake gemstone?
- A large, flawless, vividly coloured stone offered at a price that seems too good to be true, often paired with only an in-house certificate.