S.W. Favorite 
Purple Constellation

S.W. Chriset Stone in a simple setting but has facets to accent the pure light it gives.
It also changes color to a light grey purple and will glow in the dark when charged in sunlight. 
It has a Lobster Clasp and you can choose length of chain. Stone is a 20mm circle.

Sunset Writings
www.swcreativedesigns.com