Vesuvianite (idocrase) was first described on Mount Vesuvius — a complex silicate faceting into olive, chartreuse and rare blue gems with glassy brilliance. Fine transparent crystals are collector rarities; hardness 6.5.Each vesuvianite at GEMIC Institute is natural, certified by our gemologists in Siem Reap and filmed as the exact stone for sale. Unique pieces; worldwide tracked shipping, 30-day inspection period.