Copper & Stone Cross Necklace Enhancer

Copper Cross With Turquoise Center I Assume Its Either Sodalite or Composite Turquoise. Its Not Plastic. I Bought This At Jewelry Show And Never Used. Price Still On Back Measure About 3.75 Long This One Has A Mark That I Tried To Photograph Well. It Looks Like Part Of It Unless You Catch It Close Up At Right Angle. See Photos. Hook Is Meant To Slide On To Necklace.