Le Vian® 14K Gold Diamond & Blueberry Tanzanite Necklace- Gemstone: An oval Blueberry Tanzanite framed in round white diamonds is the colorful centerpiece of this elegant necklace for her. Two rows of Chocolate Diamonds® above completes the look. Styled in 14K white gold and suspended from an 18 cable chain with lobster clasp. Le Vian®. Discover the Legend.