Merwarth Tosto Merwarth’s contemporary jewelry is about the materials, the process, and the interaction between artist and wearer. The alternative version of Maressa’s handmade sterling silver Collar Ring features an 8-9 mm Grey Tahitian Pearl and a 2.5 mm Red Sapphire (heat treated natural sapphire) bezel set in 14 Karat Yellow Gold at the tip of a 14 Karat Yellow Gold Stick. Also available with a White, Pink, Black/Grey or Chocolate Akoya Pearl or a Golden South Sea Pearl.