1950s era tourbillon ring

1950s swirl ring in 750°/°° -18 KT yellow gold and platinum. In the center a brilliant-cut diamond with an estimated weight of 0.85/0.90 carat. Surrounded by 6 brilliant-cut diamonds of 0.20 carat each, or approximately 1.20 carat. A line of 28 8/8 cut diamonds following the shape of the swirl. Estimated weight 0.60/0.70 carat. Total weight of diamonds: 2.65/2.80 carat. Very good quality of the diamonds set on this ring. VVS/VS purity - G color. Collector's jewel from this period. Metric 57/58. Ring adjustment possible. Gross weight 11.31 grams. These ring models from the 50s were often worn on the middle finger. Excellent condition.