14k reversible diamond and Tanzanite shop vintage ring

Product Name: 14k reversible diamond and Tanzanite shop vintage ring
This is a 14k white gold reversible ring. This is a vintage ring and it is quite rare. One side has 15, 1.5 mm diamonds, and the other side has a tanzanite that's 5mmx4mm with a 1.5mm diamond at each of the four sides. It has approx .28ct in diamonds shop and I believe the purple stone is tanzanite and it's .35ct. it's either a tanzanite or amethyst but I really believe it's a tanzanite because that's mostly what were used in this ring. This is a size 7 and 1/2. This ring is stamped 14k 585 and it's also stamped Cardow. I found a couple of these rings online, but only one in white gold. This truly is a rare find.