Presentation

COSMAO is an auction house approved by the Conseil des Ventes Volontaires aux Enchères Publiques (Council for Voluntary Public Auctions).
Founded in 2025 by an auctioneer and a gemologist, each with over 15 years of experience, COSMAO is an auction house specializing in the sale of jewelry and jewelry pieces, exclusively online. COSMAO aims to modernize and facilitate the purchase of jewelry at public auctions. Thanks to its team of certified gemologists, the company guarantees reliable expertise and fair estimates.

To reach the widest possible audience and offer enthusiasts, collectors, and professionals easy access and a simple auction system, COSMAO organizes its sales exclusively online on the DROUOT platform and the INTERENCHERES platform, with two sales per month. All you need to do is register on these platforms to be able to bid at the sales. COSMAO thus offers its sellers access to more than two million potential bidders. COSMAO is the name of one of the co-founder's ancestors. Nicknamed “Va de bon coeur” (Go with a good heart), he was an admiral in Napoleon's navy and distinguished himself during the capture of Diamond Rock in Martinique from the English. His name is engraved on one of the pillars of the Arc de Triomphe in Paris.