Gemstone reports: what GIA and GRS are
· Gemmology
Why a laboratory report matters and what it says.
A certificate is a report on a specific stone from an independent gemmological laboratory. GIA and GRS are among the best-known laboratories.
What the report states
- The species of the stone and that it is natural
- Weight, dimensions and cut shape
- Colour and, for some stones, the country of origin
- Signs of treatment, if any
When you need one
For valuable stones, buying as an asset and resale. For a gift or jewellery a report is advisable, though not always required.