Red Mahenge Spinel Crystal 10.60ct, Dimensions of Crystal = 12.00 11.00 11.50mm, Natural & Untreated, August Birthstone, Cubic Crystal System, Bipyramidal, Sourced from Mahenge,Tanzania. Red Spinel Crystal, Mahenge 10.60Ct, Natural, Untreated, Bipyramidal, Sourced Tanzania, August Birthstone, Cubic System