This page gathers the stones in our collection accompanied by a report from the Gübelin Gem Lab, the Swiss laboratory whose gemmological reports are among the most widely recognised in the trade. A Gübelin report typically confirms the identity of the gemstone, states its geographic origin where determinable, and discloses any detected treatment — the three points that most influence how a fine coloured stone is understood and valued in the market.
At present the selection here is drawn from Mozambique Ruby. Ruby owes its red to chromium within the corundum structure, and material from Mozambique is known for a saturated red that can range from slightly purplish to a warmer, more vivid tone. Because ruby is routinely offered both heated and unheated, and because origin carries real weight in this variety, an independent laboratory opinion is particularly meaningful.
When comparing stones within this page, read the report alongside the stone itself. Weigh colour saturation and evenness, clarity and the visibility of inclusions, the cut's effect on brightness, and the stated treatment status — then consider how the stone will sit in the setting you have in mind.
