Diamonds are SI H and clean and white. NICE ring and circa 1920s. Gram Weight: 3.5 grams.Powered by SixBit's eCommerce Solution. The item "Antique 1920s $5000 1ct Old Mine Cut Diamond 18k White Gold Filigree Ring" is in sale since Sunday, March 4, 2018. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Rings\Diamond". The seller is "oldtreasures333" and is located in American Fork, Utah. This item can be shipped worldwide.