1920's Portrait Colour Change Sapphire Intaglio Seal unisex Demantoid Garnet and old cut

Demantoid Garnet and old cut Diamonds

Posy Rings (aka posie

Old Cut Diamonds - total weight approx

Fittings are 15k gold

and the goldfinch for joy

1920's Portrait Colour Change Sapphire Intaglio Seal unisex Demantoid Garnet and old cutDATE: 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