A very rare two-strand natural pearl and diamond necklace. © Christie's Image 2011

The two-strand necklace composed of one hundred and twenty graduated white natural pearls and one cultured pearl measuring from 4.7 to 12.2 mm, joined to the diamond clasp, mounted in platinum, 45.6 cm long - Lot 3253. Estimate HK$5,500,000 - HK$7,500,000 ($700,000-900,000). Price Realized HK$11,524,000 ($1,488,246)

Accompanied by report no. 58880 dated 18 March 2011 from the SSEF Swiss Gemmological Institute stating that the analyzed properties confirm the authenticity of one hundred nineteen saltwater natural pearls, one freshwater natural pearl and one saltwater cultured pearl 

Christie's. HONG KONG MAGNIFICENT JEWELS, 31 May 2011, Convention Hall