This is a slice from a Agate geode that has been sliced  electroplated and is ready to be worn as a pendant.

Weight 31.35 cts app

Size 43 x 30 x 4 mm app

The agate slice displays crystal formation and amethyst point has been sdded to good effect

Amethyst  is  a purple form of quartz and it is the Birthstone  associated with February..Amethyst occurs in primary hues from a light slightly-pinkish violet to a deep grape purple. Amethyst may exhibit one or both secondary hues, red and/or blue. The ideal grade is called "Deep Siberian" and has a primary purple hue of around 75–80 percent, 15–20 percent blue and (depending on the light source) red secondary hues