December’s birthstone is blue topaz
December’s blue is London topaz: ink-dark, teal in reflected light, and steady. Irradiated then rested for months; the color is stable for life and disclosed on the passport.

- HARDNESS
- 8, with one cleavage plane; bezels are our default
- THE COLOR
- Ink-dark blue, teal in reflected light
- GOOD TO KNOW
- The treatment is named on the passport, in the same type size as everything else
The short answer
December’s birthstone is blue topaz. December’s blue is London topaz: ink-dark, teal in reflected light, and steady. Irradiated then rested for months; the color is stable for life and disclosed on the passport. Works with topaz at Made With Color today run from From $860; every stone ships with a passport naming origin, carat, and treatment plainly.
What is the December birthstone?
December’s birthstone is blue topaz. Ink-dark blue, teal in reflected light.
Is topaz durable enough for daily wear?
8, with one cleavage plane; bezels are our default.
What should I know before buying?
The treatment is named on the passport, in the same type size as everything else. Every stone here is chosen loose, in daylight, and passported.
The London Topaz Pendant
LONDON BLUE TOPAZ · 18K
From $860
The Topaz Dome
LONDON BLUE TOPAZ · CUSHION · 18K YELLOW · WIDE DOME
$1,120
The Topaz Huggies
LONDON BLUE TOPAZ · BAGUETTE · 18K YELLOW · PAVÉ CHANNEL
$680