7 Ways to Check Whether a Sapphire Is Genuine
1. Examine the colour
Natural sapphires can have variations in colour and colour zoning. However, some natural stones are evenly coloured, and synthetic sapphires can look remarkably similar. Colour alone cannot establish authenticity.
2. Inspect the stone under magnification
A jeweller's loupe or gemological microscope may reveal internal crystals, growth patterns, fractures, or gas bubbles. These features can help an expert distinguish natural sapphire from synthetic material.
3. Check the surface and facets
Look for scratches, chips, and uneven polishing. These may indicate wear or damage, but they do not reliably distinguish genuine sapphire from imitation stones.
4. Observe its transparency
Sapphires range from transparent to opaque. A clear stone is not necessarily fake, and a stone with visible inclusions is not automatically natural.
5. Get professional gemological testing
Gemologists can use refractive-index measurements, microscopy, spectroscopy, and other tests to identify the gemstone and investigate whether it is natural, synthetic, or treated.
Gems & Gemology
6. Verify the laboratory report
Check the issuing laboratory, report number, stone measurements, weight, identification, and treatment findings. Confirm the report directly with the laboratory where verification is available.
7. Buy from a reputable seller
Request a written invoice and accurate disclosure of whether the sapphire is natural or laboratory-grown and whether it has been treated. Avoid relying on verbal claims alone.