6x4mm Purple Tanzanite Princess Ring, Women's Sterling Silver Tanzanite Ring. This ring contains one Natural Tanzanite Gemstone that measures 6x4mm, and high quality Cubic Zirconia's. This ring is solid 925 sterling silver and is available in silver (platinum plated), rose gold or gold plating. This item includes a gift box and a certificate of authenticity with purchase. Please allow about 10-15 days for processing and delivery of this item.