Black jadeite, orange sapphire and ruby pendent necklace, by Alessio Boschi. Photo courtesy Tiancheng International Auctioneer Limited

Suspending an oval-shaped black jadeite cabochon, atop by four orange sapphire-set bat motifs, three highlighted by an inverted pear-shaped rose-cut colourless sapphire and one with an inverted pear-shaped ruby, surmounted by another similar motif with a diamond-set hook, strung on a black cord decorated by a diamond-set bat motif with an inverted pear-shaped rose-cut ruby. The gallery decorated with a diamond-set Chinese emblem surrounded by five bat motifs, symbolizing 'Wu Fu Lin Men'. Pendant detachable. Black jadeite cabochon measuring 38.48 x 33.50mm. Mounted in 18 karat white and rose gold. Signed Alessio Boschi. Estimate US$39,000 - 58,000

Accompanied by Hong Kong Gems Laboratory report numbered GL77799 dated 26 March 2013, stating that the black jadeite pendant is natural, known in the trade as "A jade". 

Tiancheng International Auctioneer Limited. SPRING AUCTION 2013 JEWELLERY AND JADEITE. 15 Jun · 3 pm. Hong Kong Headquarters 30/F Bank of China Tower 1 Garden Road, Central Hong Kong http://www.tianchengauction.com/