A cabochon in blue with red inclusions cut from a solid vein stone from Stone Mountain Mine. $40 for 13.7 carats untreated & un-backed nvctadmin Blog, From the Lapidary Shop, Uncategorized Comments A cabochon in blue with red inclusions cut from a solid vein stone from Stone Mountain Mine. $40 for 13.7 carats untreated & un-backed