An antique diamond bouquet brooch en tremblant, circa 1875. Photo Bonhams

composed of rose, old mine and modified brilliant-cut diamonds; accompanied by fitted presentation box; estimated total diamond weight: 4.90 carats; mounted in silver-topped fourteen karat gold; length: 2 3/4in. (one diamond deficient). Estimate: US$3,000 - 5,000

Bonhams. Salon Jewelry & Watches, 26 Mar 2012. California, San Francisco and California, Los Angeles www.bonhams.com