RAPAPORT... Belgian diamond manufacturer HB Antwerp has appointed Valerie Geluykens as head of sustainability for Signum, its experiential luxury brand.Geluykens recently joined the company from Claes Retail Group, owner of Belgian fashion labels CKS, JBC and Mayerline, HB said last week. Signum is a technology-based brand that enables customers to buy diamonds in physical and digital forms, for example through non-fungible tokens (NFTs). Image: Valerie Geluykens. (Valerie Geluykens/LinkedIn)