Each Chaumet jewellery or watchmaking piece is engraved with:
– A hallmark corresponding to the metal used: 18-carat 750‰ gold, 950‰ platinum or 316L steel,
– A unique individual number that identifies it and certifies its authenticity,
– The Chaumet signature,
– A size if it is a ring or a bracelet,
– The « Water resistant » inscription for Chaumet watches.