I find opals endlessly fascinating. The variety of colours and how spectacular they can be really appeals to me.

This black opal and diamond pendant/brooch combo by Ruser, offered by Lang Antiques with a mystery celeb provenance, is “An intriguing and enchanting gemstone, a 15.00 carat pear-shaped Australian black opal, casts a deep electric cobalt blue hue, whilst crowned by a tiara composed of five icy-white and sparkling, high-quality pear-shaped diamonds (together weighing 1.35 carats), in this majestic Mid-Century vintage jewel. Designed by none other than Beverly Hills’ jeweler to the stars of Golden Age Hollywood–William Ruser (the former Rodeo Drive location is now home to Van Cleef & Arpels)–this entrancing adornment, in fact, comes from the estate of a renowned A-list Hollywood actor (only to be revealed upon purchase). Hand fabricated in platinum, it is wearable as both a pendant and brooch and measures 1 1/4 inches by 3/4 inch. The newer chain measures 16 inches.”

This is USD$15,000.