This page gathers the stones in our collection that are accompanied by a report from GIT, the Gem and Jewelry Institute of Thailand — the country's national gemmological institute, based in Bangkok, one of the world's principal centres for the coloured stone trade. A GIT report documents a gem's identity and characteristics as observed under laboratory conditions, giving a written record that travels with the stone.
The varieties represented here are drawn from two families. From the corundum group you will find blue sapphire, pink sapphire and purple sapphire, whose colours arise from trace elements such as iron, titanium and chromium within the same underlying mineral. From the tourmaline group come Paraiba tourmaline, prized for the copper-bearing glow that distinguishes it, and green tourmaline.
When choosing between them, read the report and the stone together. A laboratory document confirms what a gem is and discloses detected treatment; it cannot describe how a stone behaves in daylight, under lamplight, or against your skin. Weigh the certificate alongside colour, clarity, cut and the proportions that govern light return.
