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

These are a early example of the technique

they're crafted in platinum throughout and remain in near-perfect condition

A stylish Victorian bangle studded with square "nails"

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

It remains complete with original bail

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