Lot 193. 5.02 carats, Fancy vivid yellow heart-shaped diamond and diamond ring. Estimate HK$1,500,000 - 2,500,000 ( US$192,000 - 320,000) & Lot 194. 6.22 carats triangular Mozambican Paraiba tourmaline and diamond ring. Estimate HK$1,500,000 - 2,500,000...