It is gold with pearls and black onyx and at its center hangs a pale green tourmaline. It is dated between 1930 and 1933. As with the Tiffany Diamond, the rare appearance of this necklace in ...

Through her gem portfolios, Hangartner works with clients to use gemstones for wealth preservation. With the diamond market in turmoil, only exceptional stones in size and quality, especially coloured ...

Bond Street Auction is preparing to close out the season with an event that collectors and connoisseurs won’t want to miss.