1920's Portrait Colour Change Sapphire Intaglio Seal Etruscan An incredible ancient intaglio dating

An incredible ancient intaglio dating from the Roman Republic forms the centrepiece of this gold signet ring

all stamped 9ct

25ct diamonds - emerald cut

They typically feature bigger tables

1920's Portrait Colour Change Sapphire Intaglio Seal Etruscan An incredible ancient intaglio datingDATE: 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