Diamonds Forum

Size of Cubic Zirconia vs Diamond

I know carat is the weight of the stone. But cubic zirconium is heavier than diamond. So 1 carat cubic zirconia should be less than 1 carat diamond.

But how much less. If they are both round cut and both weigh 1 carat. How much smaller is the diameter of the cubic zirconia? Would diamond be like 8mm in diameter and cubic zirconia 4mm? Or like diamond 8mm and cubic zirconia 7.5mm?

I’m having trouble finding this information through google. No exact values, just “cubic zirconia is smaller” or similar information.

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