A beautiful Nickel-free Sterling silver Designo rectangle ring. Featuring light blue resin with silver butterfly accents. Designo, is our exclusive line of luminous colored resin combined with sterling silver and anti-tarnish A beautiful Nickel-free Sterling silver Designo ring. Featuring black resin with silver flower accents.Designo, is our exclusive line of luminous colored resin combined with sterling silver and anti-tarnish rhodium. The colored resin is extremely durable and scratch resistant and the rhodium gives pieces a brilliant platinum-like finish. Designo was created exclusively for The Boca Jewelry Store by designer Alan K.