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, these 18kt yellow gold hoops shine with .20 ct. t.w. round brilliant-cut diamonds in floral designs. Length is 1/2". Hinged. Made in Italy. Clip/post, Roberto Coin diamond hoop earrings.