BRAND NEW HAND MADE CREATED OPAL DOUBLET NECKLACE STERLING SILVER 925. OPAL DOUBLET IS 11MM BY 9MM.  NO TWO OPALS ARE THE SAME. EACH ONE HAS ITS OWN DNA.  THIS OPAL HAS BLUE, GREEN, PURPLE HUES. TRULY BEAUTIFUL PIECE ESPECIALLY WHEN LIGHT HITS ON IT. STERLING SILVER CHAIN COMES IN 16 OR 18 INCHES. PLEASE SPECIFY THE LENGTH WHEN ORDERING. COMES WITH A BEAUTIFUL BOX.