Non-nacreous Clam Pearl, Tridacna species, Coastal waters near the Phillippines. Estimate: $US$ 10,000 - 15,000 (€8,900 - 13,000). Photo: Bonhams.

Large in size, but also exceptional due to its perfect egg shape, the flame pattern iridescence is particular fine at the apex of the pearl. Weighing approximately 22.73 carats and measuring 17.0 x 13.0mm

Bonhams. LAPIDARY WORKS OF ART, GEMSTONES AND MINERALS INCLUDING GOLD, 19 May 2015 10:00 PDT - LOS ANGELES