Natural or synthetic diamond: how to tell them apart
Laboratory-grown diamonds have the same composition as natural ones: telling them apart takes instruments and expertise.
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Conferences, publications, updates and communications to members.
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Natural pearls, cultured pearls and imitations: the differences
Three very different families in origin and value: how to recognise them and what to ask the seller.
The gemmological certificate: what it says and why it matters
Identification, weight, cut and treatments: what you find in a certificate and how it differs from a valuation.
Treated gemstones: what “heated” means
Heating, oils and fillings are common practices, provided they are disclosed: how to read the treatment information.