Rihanna wore a $700,000 Jacob & Co diamond watch on a neck choker in June. A Swiss company claims it has developed expertise that chemically profiles any diamond so it could identify the nation... Luxury clothes, jewelry, and equipment model Sabyasachi held a runway present for its nice jewellery Jewelery News line in New Delhi. Vancouver-based diamond miner Lucara Diamond Corp. introduced the restoration of a 692.3-carat diamond from its Karowe Diamond Mine situated in Botswana. Melbourne Jewellery Expo will take place from 4-6 February and will be co-located with the 2023 Gift Fair and Frontline Retail stores events. Diana,…