1920's Portrait Colour Change Sapphire Intaglio Seal
1920's Portrait Colour Change Sapphire Intaglio Seal
$350.00
Description
DATE: 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 they're viewed under. Although daylight and electric light both appear as "white" light, the former is much richer in green wavelengths and the latter is richer in red wavelengths. When combined with a gemstone's ability to absorb specific wavelengths of light, this difference in the two light sources can be enough for certain gemstones' body colour to change entirely. Alexandrite is the best known colour-change gem, but some sapphires and some garnets can also behave in this way.
STONES
Synthetic Sapphire
MEASUREMENTS
1.4 x 1.2cm
WEIGHT
1.8g
MARKS
No marks present
CONDITION
Excellent
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