OOAK Natural AAA Blue Tanzanite Oval Shaped Domed Back Cabochon "4" - Measuring 10mm x 14mm, 6mm Dome Height - High Quality Gemstone Cab
PLEASE NOTE: All of these tanzanite cabs have a slightly domed back. It's less than 1mm, but you may still need to use a step when setting them, or leave your setting back open.