Mystic Black Spinel Heart Briolettes measure approximately 7x7x4mm average in size, have a vitreous luster, have good polish, are a symmetrical shape, are translucent with minute internal characteristics in an extremely brilliant body, gems are a medium indigo blue hued metallic strand of Black Spinel beads which have been treated with a Mystic bluish purple coating for a shimmering group of heart beads.