Blue Goldstone (also called Sandstone) was first created by Venetian glassmakers in the 17th century… it gets its sparkle from copper flecks mixed throughout the molten glass. 
Blue goldstone is all about intuition, manifesting & insight from divine guidance.  It’s also very useful for astral travel and lucid dreaming - especially when paired with Grape Agate!
Stars are approx 3x3”