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 ...
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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 ...
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