Gemstones, including rubies, emeralds, and sapphires, ... Raw or rough gemstones like rubies or sapphires, if they are of significant size and quality, may be of interest to the buyers.

Iridis, the world's largest producer of high-quality tourmaline gemstones, is pleased to announce its inaugural auction of Zambian rough tourmaline gemstones in Bangkok on 21-24 November 2023.

Rough gemstones can be irradiated at various stages of cutting, from completely uncut ones to cut and polished ones, which are ready for mounting on a necklace, for example. Typically, the gemstone ...