Necklace RC Roberto Coin Miniature Four-Petal Flower Diamond Pendant Necklace. Made of brass with gold and platinum plating, available in 2 colors. Size: Total length approximately cm + 2cm + 2.5cm; small flower approx. 1.0x1.0x0.4cm; necklace weight about 2.9g. Roberto Coin, Italian jeweler, Robert Coin, Princess Flower Collection. Just as the four-leaf clover is to Van Cleef & Arpels, the four-petal flower is one of RC's iconic designs, inspired by the decorative motifs of Venetian palaces. Four elegant olive-shaped petals crafted from diamonds, gold, and various materials.