HERE WE HAVE A VERY BEAUTIFUL SOLIOD 14K GOLD PENDANT/ENHANCER. I HAVE NEVER SEEN ONE LIKE THIS. IT HAS A BAIL ON THE BACK THAT OPENS ON A HINGE AND HAS A SLIDE THAT WILL SLIDE INTO PLACE TO LOCK IT. THIS WAS PROBABLY USED ON SMALLER PEARLS OR BEADS BUT ANY MEDIUM SIZE CHAIN OR SMALLER WILL FIT BEHIND THE HINGED BAIL. THE CENTER CLEAR STONE I TESTED IT IS NOT A DIAMOND MOST LIKELY A CZ. THIS WEIGHS IN AT 4.7 GRAMS AND MEASURES 5/8" x 5/8". UNUSUAL ITEM.