Tanzanite and Cubic Zirconia Band Ring, Women's Purple Tanzanite Ring Platinum. This ring contains Natural Tanzanite Gemstones that measure 3x4mm, and high quality Cubic Zirconia's. This ring is solid 925 sterling silver and platinum plated. This ring is available in full and half sizes from 4 -12.5. This item includes a velvet gift box and a certificate of authenticity with purchase. This item is made to order, please allow about 10-15 days for processing and delivery of this item.