The question of authenticity accompanies every diamond. Many quick tests circulate on the internet, and some provide useful clues. But none replaces a verdict. Whoever wants certainty must know what a home test can do and where it ends.
How to recognise a real diamond
These tests can be carried out without instruments. They give clues, not a final result:
- Fog test: breathe on the stone. A real diamond conducts heat well; the fog disappears almost immediately. Fakes stay fogged longer.
- Refraction: a diamond refracts light strongly and looks alive. Glass or zirconia scatter more dully and look flatter.
- Loupe: tiny, natural inclusions tend to speak for a real stone. Perfectly flawless, very cheap stones are suspicious.
- Print test: through a loose, real diamond, text beneath it can hardly be read clearly because of the strong refraction.
Important about home tests
- They provide clues, not a verdict.
- Modern imitations such as moissanite pass some tests.
- With set or enclosed stones many tests cannot be applied.
Why a certificate says more than any home test
A gemmological laboratory tests with instruments that are not available at home: thermal conductivity, refractive index, spectral analysis. The result is documented in a certificate that records cut, colour, clarity and weight. This document is the most reliable mark of authenticity because it makes the examination traceable.
Every diamonds in glass® piece is delivered with its own certificate and a number. Via this number the authenticity can be verified online at any time, without removing the stone from the glass.
Verify the authenticity via the certificate number.
Verify a certificate
