Amanda Rose Collection Sterling Silver Three Stone Past Present and Future Cubic Zirconia Ring (Sizes 5-8) 4ct TGW Sterling Silver Setting with Cubic Zirconia if comparing to a diamond ring, this would be the "size" of a 3ct total weight diamond ring, but the cubic zirconia weigh over 4 carats. choose your size from 5 to 8 ( Whole sizes only) .925 Sterling Silver Setting Cubic zirconia weighs much heavier than diamond , a 7mm round cubic will weigh over 2 carats while the same size diamond will weigh just over 1 1/4ct. Sterling Silver Setting with Cubic Zirconia if comparing to a diamond ring, this would be the &#034;size&#034; of a 3ct total weight diamond ring, but the cubic zirconia weigh over 4 carats. choose your size from 5 to 8 ( Whole sizes only) .925 Sterling Silver Setting