Old-cut diamonds, platinum, circa 1925
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‌Diamonds: 1 old-cut measuring approximately 10.35 - 10.45 x 6.00 mm with an approximate total weight of 4.30 - 4.60 carats. Approximately 266 remaining with a total weight of 12.50 - 13.50 carats. Approximate diamond total weight 16.80 - 18.10 carats
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‌Size/Dimensions: 16.2 x 2.5 cm (6³⁄₈ x 1 in)
‌Gross Weight: 64.5 grams

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May Bourne Strassburger (1883 – 1959) was the eldest daughter of Frederick G. Bourne, the fifth president of the Singer Manufacturing Company. She married Ralph Beaver Strassburger, one of the founders of the Pennsylvania German Society in 1911. Together the Strassburgers traveled between their farm in Gwynedd Valley, Pennsylvania and their homes in Paris, Deauville and Chantilly, France as well as Palm Beach, Florida. They were known as avid antique collectors and breeders of thoroughbred racehorses.