Fine Estate Jewelry, Certified Diamonds & More. Antique Art Deco 18k White Gold Filigree 1 Cttw Diamond Oval Estate Brooch Pin. Twin City Gold is please to offer this beautiful white gold filigree brooch.It features approximately 1cttw of old european cut diamonds with an average color and clarity of G, Si1. This pin measures approximately 7/8" x 1-3/4". It is not marked however has tested as 18k. Please inquire with location for a price estimate. Any product you return must be in the same condition you received it and in the original packaging. The item "Antique Art Deco 18k White Gold Filigree 1 Cttw Diamond Oval Estate Brooch Pin" is in sale since Tuesday, May 30, 2017. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Fine\Art Nouveau/Art Deco 1895-1935\Pins, Brooches". The seller is "estatejewelry66" and is located in Biddeford, Maine. This item can be shipped worldwide.