A Single Strand of Multi -Colour South Sea Cultured Pearl and Diamond Necklace. Photo courtesy Tiancheng International

Composed of twenty - five round multi - coloured South Sea cultured pearls measuring from 15.1 mm to 16.7 mm, completed by a diamond ball clasp with diamond weighing 0.20 carat, mounted in 18k yellow gold. Length 43 cm. Estimate HK$98,000 - 138,000 US$12,600 - 17,700

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