Very Fine Conch Pearl, Strombus gigas or "Queen Conch", Caribbean Sea. Photo Bonhams.

A fine flame pattern iridescence shimmering across the surface of this deep reddish pink conch pearl is the culmination of all the best attributes which recommend this fine non-nacreous pearl. It also possesses an excellent oval outline, perfect symmetry and a vitreous porcellaneous luster making it suitable for mounting in a fine item of jewelry. Weighing approximately 4.02 carats and measuring 9.5 x 7.5 x 6.5 mm. Estimate US$ 10,000 - 12,000 (€7,500 - 9,000). Unsold

Bonhams. Gems, Minerals and Lapidary Works of Art New York - 23 May 2012