An unmounted melo pearl.  Photo Bonhams

The near-round undrilled melo pearl of orange hue, weighing 173.20 carat, measuring 29.3 x 27.9mm. Lot 671. Estimate: HK$ 1.9 million - 2.7 million / US$ 250,000 - 350,000 // £160,000 - 220,000. Unsold

Accompanied by a report from GIA, stating that the saltwater melo pearl is natural and has no indications of treatment. Report number 6112849002, dated 28 Jan 2011

天然海水海螺珍珠 (美樂珠)

Bonhams. 26 May 2012 2 p.m. Hong Kong. Fine Jewellery & Jadeite