Named for the Polynesian atoll of Tetiaroa, this stunning ring features a rose-gold crab alight in tiny tanzanites and a shimmering azure sapphire, holding up a breathtaking, swirling matrix opal. 18k rose gold/sapphire/tanzanite/matrix opal. Made in the USA. SPACE: A shop for emerging and advanced designers. Daniela Villegas's multi-gemmed, multi-element rings and earrings would feel at home at the Museum of Natural History; their skeletal forms and arthropod references convey ideas about movement and time, exploration and adventure..