By purpose
Certified stones
A certificate does not make a stone better — it makes it verifiable. Below are the listings that carry a laboratory report, and an explanation of what to look at in one.
No stones match these filters.
Clear a filter or write to us — we will search by hand.
What to look at in a report
Laboratory and number. A report from an unrecognised laboratory, with no verifiable number, is a sheet of paper.
Natural origin. The essential line: natural stone or synthetic. Everything else is secondary.
Treatment. Heat is normal market practice for many stones, but it must be named. Undisclosed treatment is a reason to ask questions.
Geographic origin. It affects price considerably and is not always determinable: some reports honestly state “undetermined”.
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