A unique multi-gem 'xuansi' pendent necklace, by Wallace Chan. Estimate HK$1,800,000 – HK$2,800,000 ($233,303 - $362,915). Photo Christie's Image Ltd 2014

The pendant designed as a pavé-set brilliant-cut diamond and yellow diamond and circular-cut pink sapphire detachable yinyang, enhanced by a cushion-shaped ruby weighing approximately 2.09 carats and a cushion-shaped fancy intense yellow diamond weighing approximately 2.99 carats, suspended by a neckchain designed as a series of circular-cut pink and yellow sapphire yinyangs alternating with ropetwist links lined with brilliant-cut diamonds, mounted in yellow and purple titanium, 60.5 cm long. Signed Wallace Chan . 

Accompanied by report no. 14730899 dated 22 December 2005 from the Gemological Institute of America stating that the 2.99 carat diamond is fancy intense yellow, natural colour, VS1 clarity

Report no. 50321 dated 1 February 2008 from the SSEF Swiss Gemmological Institute stating that the 2.09 carat ruby is of Burma (Myanmar) origin, with no indications of heating

Please note that two certificates are more than 5 years old and might require an update

Christie's. HONG KONG MAGNIFICENT JEWELS, 27 May 2014, Convention Hall