Group of four vintage openwork rings, all with diamonds.One marked 19 karat white gold and platinum openwork ring with a central round brilliant cut diamond, 6 surrounding round brilliant cut diamonds, and 2 triangle cut sapphires. Marked "19 K PLAT" with an unknown symbol. XRF tests to 60% gold (Au) and 17% platinum (Pt). Center stone is 0.25 ct, smaller diamonds are 0.02 ct each. Carat total weight is amost 0.4 CTW. Sapphires are 1.69 mm long by 1.85 mm wide. Total weight is 2.8 grams / 1.8 dwt. Size is about 6.25. Good condition, minor wear.One marked 18 karat white gold and diamond openwork ring. Marked "18K" (partially obscured) and a worn, illegible marking. One diamond, round brilliant cut, 0.5 ct (1/2 carat). Total weight: 2.6 grams / 1.6 grams. Size: 5.5. Good condition, minor wear.One marked platinum openwork ring with 3 central diamonds and 8 side diamonds, all round brilliant cut. Marked "PLAT" (worn). Tests as about 82% Pt. Central diamond: 0.23 ct. Side diamonds: 0.06 ct. Surrounding diamonds are melee. Carat total weight: about 0.5 CTW (1/2 carat). Total weight: 3.3 grams / 2.1 dwt. Size: 5.5. Good condition, minor wear.One marked 18 karat white gold openwork ring with one central round brilliant cut diamond and four smaller round brilliant cut diamonds on the setting. Marked "18K". Central diamond is about 0.16 ct. Side diamonds are approximately 0.02 ct each. Carat total weight: about 0.25 CTW (1/4 carat). Total weight: 2.3 grams / 1.4 dwt. Size: 4.5. Good condition, minor wear.Keywords: jewelry, fancy, precious, heirloom, wedding, marriage, bride, bridal, engagement.