Yellow jadeite, jadeite and diamond brooch, Kung Tsung Tzu. Photo: Sotheby's

Modelled as a flower in full bloom, the petals set with five translucent yellow jadeite plaques, the stem set with a jadeite plaque of bright emerald green colour, highlighted by five brilliant-cut diamonds, mounted in 18 karat blackened gold, signed. Yellow jadeite plaques approximately 18.10 x 7.30 x 3.00mm to 14.55 x 16.10 x 2.82mm; jadeite 'stem' approximately 33.82 x 10.20 x 2.51mm. Estimate  70,000 — 90,000 HKD