TOUS Good Vibes necklace with lucky 13 medallion and horseshoe in silver vermeil, 3-mm treated ruby and apatite, and 2.5-mm pearl. Dark Silver chain. Medallion horseshoe size: 1.5 1 cm. Necklace length: 46 cm, with 42-cm ring. Sterling silver plated with 18kt gold with a thickness of 3 to 5 microns and with no other metal between them. (Dark Silver: Sterling silver covered with a layer of ruthenium, a mineral that gives strength and shine.) Production technique: Microfusion.