1920's Portrait Colour Change Sapphire Intaglio Seal hunting These are a early example

These are a early example of the technique

An Art Nouveau filigree necklace by Norwegian jeweller Marius Hammer

Excellent Victorian three-stone gyspy ring set with a blue sapphire flanked by two chunky old cut diamonds

The head displays the whole gamut of retro intricacies

with the stone resting in a fine millegrain bezel setting with small engraved details

1920's Portrait Colour Change Sapphire Intaglio Seal hunting These are a early exampleDATE: Art Deco, c. 1920 A fantastic colour change sapphire (synthetic) seal, with a intaglio carving to the base. It's carved with a ladies portrait and the stone changes from a bluey purple to a turquoise green when moved from electric light to daylight. It remains in great condition and dates to the Art Deco period, circa 1920. Colour change gemstones possess the ability to appear as two completely different colours depending on the type of light