A Ruby and Diamond Bangle by Hammerman Brothers. Photo courtesy Tiancheng International

Designed as a series of diamond shapes, each set with an oval - shaped ruby in the centre surrounded by two rows of brilliant-cut diamonds within an openwork. The rubies and diamonds altogether weighing 23.51 carats and 65.52 carats respectively, mounted in 18k yellow gold. Length 19 cm. Signed HB for Hammerman Brothers. Estimate HK$1,950,000 - 3,500,000 US$250,000 - 450,000

Hammerman is one of the largest manufacturers of fine jewellery in the United States. The current lot presents the brand's signature – fine gems, precision and craftsmanship, as shown in the meticulous details and suppleness of the bangle.

Tiancheng International. Hong Kong Autumn Auction 2011. 28 Nov 2011 www.tianchengauction.com