These are in excellent condition, and are from a New Jersey estate where the previous owner had an extensive collection of Native American pottery, and jewelry.  The information I have was what was found with this necklace.  These are marked with hard to see hallmark that I was not able to identify the artist, but maybe you can, and measures 5/8", and weights total 2 grams.  Please look closely at my photos for details.  Item 6742