Santorini Dark Blue Chalcedony Heart Briolettes measure approximately 9x93mm up to 11x11mm in size, have a vitreous luster, excellent faceting with a symmetrical shape, the polish is excellent with no pitting or abrasion, these Chalcedony beads are a treated santorini blue color resembling the domed roof tops in Santorini Greece, gems are a medium dark saturation with slight color zoning, and these gems show a beautiful billow of light within these well made Chalcedony.