Art Deco sapphire and diamond ring, circa 1910. It is millegrain set with a cushion cut diamond, the surrounding calibre cut sapphires forming a lozenge, diamond dart highlights to the corners and a diamond set outer border. Via Diamonds in the Library.
The 423 carat Logan Sapphire was cut from a crystal mined in Sri Lanka and is one of the world's largest faceted blue sapphires (it is about the size of an egg). It is the heaviest mounted gem in the National Gem Collection, and in its brooch setting is framed by twenty round brilliant-cut diamonds, totaling approximately 16 carats.
Very colorful boulder opal from all angles and directions (looks like fine black opal). 3.49 grams of 14k yellow gold surround this boulder opal doublet weighing 1.04ct flanked by a diamond at either side weighing .06TCW.