December — Blue Topaz

This blue did not exist before 1970.

Topaz comes out of the ground colourless or brown. Swiss blue and sky blue are made — the rough is irradiated and then heated, which shifts the colour permanently. It is a treatment, it is stable, and it is disclosed on every product page here.

December has four stones on the modern list. Blue topaz is the one we set.

Or the colour, at entry price: the December Month in Colour necklace → — gold-plated solid silver with a blue baguette, cut from cubic zirconia rather than topaz.

The file on turquoise, December's oldest stone →
All twelve months →