Founded in Vicenza, the City of Gold in 1977, Roberto Coin jewelry celebrates the elegance of femininity, creativity and craftsmanship. From… Founded in Vicenza, the City of Gold in 1977, Roberto Coin jewelry celebrates the elegance of femininity, creativity and craftsmanship. From the "Princess Flower" collection, this superb necklace glistens with .47 ct. t.w. round brilliant-cut diamonds in polished 18kt yellow gold. Cable chain includes a 2" extender. Made in Italy. Lobster clasp, Roberto Coin diamond necklace.