Vintage Black Opal Ring Platinum Plated, Natural Black Opal Ring Sterling Silver. This ring contains a natural fire opal that is dyed black, measuring 5x7mm. This ring is 925 Sterling Silver and Platinum Plated, also available in Gold Plating or Rose Gold Plating. This item includes a velvet gift box and a certificate of authenticity. This item is made to order, please allow about 10-15 days for processing and delivery of this item.