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

Demantoid Garnet and old cut Diamonds

Posy Rings (aka posie

Perfect size to weight ratio

Fittings are 15k gold

Knoll and Pregizer were established in 1887 and quickly made a name for themselves making silver and paste jewellery

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