An Opal, Tsavorite, Sapphire and Diamond Brooch Pendent by Patrick Mauboussin. Photo courtesy Tiancheng International

The brooch of jelly fish motif is centred on a free form of opal with pavé - set diamond, tsavorite and sapphire surround, dangling with five tentacles which interlock and link together with aquamarines, opals and diamonds. Opals, blue sapphires, tsavorites, diamonds and aquamarines together weighing 38.89, 2.83,1.09, 1.87and 5.28 carats respectively, mounted in 18k white gold. Length 9.0 cm. With maker's mark M Paris for Patrick Mauboussin, No. 28020. Mauboussin, No. 28020. Estimate HK$85,000 - 120,000 US$11,000 - 15,400

Founded in Paris in 1827 at the height of the French Restoration and romantic eras, the House of Mauboussin evolved into a world famous jewellery house that flourished through six generations. Having inspired by organic form and precision on choosing the right stones for each unique piece, Patrick transformed the essence of oceanic creatures into a meticulous and yet lively piece of fine jewellery.

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