Gorgeous pendant/enhancer in outstanding condition.  It was just checked out and professionally cleaned by a respected local jeweler.

This is the Albion setting with 14K gold and sterling silver cable on the perimeter.  The bail is hinged and thus will open over all narrow and some medium chains - the bail is about 3/16” wide and high as measured inside.  Dimensions: the pearl measures 3/8” across and 1/2" top to bottom; the pendant overall is 1 3/16” high, ¾” across, and 3/8” deep.  Weight:  0.3 ounces 8 grams.  Stamped: 585 (14k) and 925 (sterling silver) on the back along with ©D.Yurman.