PLATINUM FILIGREE DIAMOND RING CA. 1920'S: Platinum ring centers a single old European round cut diamond of approx. .81 Ct., VS in clarity and I color. The filigree mounting also has 6 old European round cut diamonds, all totaling approx. .12 Ct., averaging VS1 in clarity and G-H color. Diamonds are bead and prong set. Weight 2.9 grams. Size 6.5. Florida Diamond Appraisers GIA graduates appraisal for $4,975 is available.