A tennis ball-size rough diamond will go on the auction block as a standalone sale in London next month. Sotheby’s says the 1109-carat ‘Lesedi la Rona,’ which is the largest gem-quality rough diamond to be discovered in more than a century and the largest rough diamond in existence today, is expected to fetch over $70 million U.S.
A Richard Mille tourbillon and a Vacheron Constantin diamond-set tourbillon sold for $426,000 U.S. apiece at Sotheby’s Hong Kong Important Watches Spring Sale. Held on April 6, the auction totalled $8.4 million U.S.
What’s hot in the world of fine jewels at auction? Sotheby’s New York senior specialist and vice-president Catharine Becket will have the answers at a gathering of the GIA Alumni Association Ontario Chapter.