Polished Agate Slab w/Silver Casing Pendant Necklace NWNT Polished Agate Slab w/Silver Casing Pendant Necklace - Stunning Large Pearlish Polished Agate Slab w/Silver Casing On A Long. (approximately 2” in length with oval shape). It hangs from 18” silver cable chain and fastens with silver toggle clasp.Necklace Length: 18”Nickel & Lead Compliant. Pet, smoke, stain and snag free. New with no tag but in box.