Jewelry Design Cactus Ring by Sergey Izmestiev The Cactus Ring, from the Japanese Garden collection, is made of 18K gold with unique 12 ct. Cat's Eye effect Ural emerald, small emeralds and diamonds. The needles are located in the inner side of cactus petals and form a plane for the central emerald cast. The central emerald represents the cactus flower, and small emeralds are set up-culet.