Roberto Coin . Strong links: 12 unchained jewellery pieces Link chains are the new trend in jewellery! Bulgari, Dior, Messika, and Van Cleef & Arpels are revisiting links in their creations. Discover our selection of unchained jewellery to spruce up your look. Vicenzaoro: Is there a new paradigm in the diamond jewellery market? Who are the buyers of diamond jewellery ? Here is what to remember from the talk organized in Vicenzaoro by the CIBJO and the Natural Diamond Council, with Roberto Coin, Mina El Hadraoui, Katerina Perez and Bérengère Treussard.