Soviet Amethyst Cut Gemstones Cut:Cushion, 16.1mm, 17.45ct and they glow blue under

and they glow blue under shortwave 222nm UV to varying amounts because of titanium contamination

creating a more sparkly and

It is just a great gem

The 99g piece has a light brown color and measures about 45

and thus naturally have formed cones which should be good preforms for large stones

Soviet Amethyst Cut Gemstones Cut:Cushion, 16.1mm, 17.45ct and they glow blue underThese are hydrothermal amethyst, labgrown material sourced from an old Soviet era collection. Under Dr Sternberg, the Alexandrov lab in the USSR was at the cutting edge of quartz crystal growth, using its piezoelectric properties for radios and clocks. Later, they branched out into growing amethyst, citrine, and other quartzes. Unusual for our site, these particular crystals were originally grown for jewelry, not for science. Some of them have smoky