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Step 1
Buy a magnifying lens. Although a cubic zirconia isn't as brilliant as a diamond, it's hard for most people to tell the difference without some aid to the naked eye.
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Step 2
Look for wear and tear on the jewel. A cubic zirconia facet wears down eventually with use. A diamond's facets won't wear down as easily.
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Step 3
Weigh a jewel of similar size and design that you're sure is a diamond. The diamond weighs less than a cubic zirconia.
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Step 4
Search for jewels that seem to have the perfect look. A cubic zirconia looks perfect with beautiful shine and perfect edges. In fact, most diamonds aren't perfect. If the jewel looks too perfect, it likely is a cubic zirconia instead of a diamond.
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Step 5
Check for color. Most diamonds have a tinge of color to them as they show imperfection. A cubic zirconia is colorless and shows the synthetic make of the jewel.
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Step 6
Test the hardness. A cubic zirconia is brittle and breaks easily. Diamonds are hard and can only be broken under special conditions such as heat, pressure and with special tools.










