Rhinestone Guy (RG) Premium (flatback) Sew On Cosmic stones feature a chunky style cut facets with 2 holes drilled on each side for sewing.
Except for Jet and Hematite, the cosmic sew on crystals feature foil on the back of the stone for extra reflection.
The cosmic sew on's are available in an 18x14mm (approx. 3/4 inch tall)