5x7mm Lab Alexandrite Statement Ring, Color Changing Lab Alexandrite Ring. This ring contains color changing lab created Alexandrite Gemstone measuring 5x7mm and high quality cubic zirconia's. This ring is 925 sterling silver and available in platinum plating (silver), gold or rose color. Available in full and half sizes from 4.5 - 12.5. Upon purchasing, please include your ring size and metal choice within your order notes. This item includes a velvet gift box an a certificate of authenticity with purchase. This item is made to order, please allow up to 10-15 days for processing and delivery of this item.