This beautiful Purple Amethyst [February birthstone] measures 5mm, and is in a heart-shaped cut. It is prong-set in a 925 Sterling Silver, back-set bezel, bailess pendant casting. The gemstone is placed against the front "frame" of the bezel, and held in place with four secure prongs against the pavilion [back] of the gemstone. No losing this gem! The 18" long, 925 Sterling Silver chain in the picture is included. A sturdy, secure gemstone pendant perfect for an active lady of any age, your Purple Amethyst Heart Necklace will arrive gift-boxed, and shipping insurance is included in the shipping costs.