Ring in platinum 850 thousandths presenting a marquise-cut tanzanite approx. 3.50 ct (reported) in a setting of twenty-eight modern and baguette-cut brilliant-cut diamonds. French work, 1960's. Tanzanite size: 15 x 7.1 x 5.7 mm Total estimated diamond weight: 2.50 ct Finger size: 48.5 - Gross weight: 8.2 g