Elegant Gold Heart locket in 9ct with seed pearls and peridot

This exquisite 9ct gold heart locket features 10 seed pearls and one peridot. Likely antique with elegant engraving of AS or AB on the back of the locket. Clean inside. Acid tested at 10ct. Purchased from a reputable jeweler in London as 9ct. Not stamped Locket measures 1” without bail. 1.25 with bail and almost .75” across. Weighs 4.16 grams.