Robuta

https://www.sothebys.com/en/auctions/ecatalogue/2014/magnificent-jewels-noble-jewels-ge1502/lot.23.html (#23) Diamond brooch, Oscar Massin, second half of the 19th century diamond broochoscar massinsecond halfof the23 https://www.sothebys.com/en/auctions/ecatalogue/2018/fine-jewels-l18052/lot.54.html (#54) IMPORTANT DIAMOND NECKLACE, OSCAR MASSIN, LAST QUARTER OF THE 19TH CENTURY diamond necklaceoscar massin