This page gathers the stones in our collection accompanied by a report from the Gemological Institute of America. GIA is an independent, non-profit laboratory, and its reports are prepared without any commercial interest in the stone described. For a coloured gemstone, a GIA report confirms the species and variety, records weight, measurements and cut, and states whether any treatment has been detected — the questions that matter most when a stone carries a name such as Paraiba or alexandrite.
The varieties represented here are those where independent confirmation carries real weight: Paraiba Tourmaline, Alexandrite, Demantoid Garnet, Chrome Tourmaline and Mozambique Ruby. Each is defined by a specific cause of colour or optical behaviour — copper in Paraiba, chromium in chrome tourmaline and ruby, the colour change of alexandrite — and each has close visual relatives that only laboratory testing reliably separates.
When choosing between them, read the report alongside the stone rather than instead of it. Confirm the variety and treatment status on paper, then judge colour saturation, clarity and cutting with your own eye, since a report describes identity, not beauty.
