The Atreides RingAntique Tourmaline 7 Stone Ring The Atreides ring features a gorgeous 0. 70ct oval step cut tourmaline, flanked by two natural marquise natural diamonds in a V prong setting. Four rectangular, baguette cut natural diamonds culminate this in geometric, retro futuristic design. The appraisal of the vintage ring is attached as one of the images; there you will find detailed information about the ring, as well as the appraised value of the ring at $3,900