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How to tell the difference between a diamond and cubic zerconia ?

I have a ring that was given to be several several years ago by my mother who passed away.. and I dont know if its a diamond or cubic.

It is very difficult to differentiate cubic zirconia from real diamond, you dont trust any home grown methods. Definitely go to gem stone testing lab and find the difference. Good test for differentiating diamond from cubic zirconia is the Immersion Contrast method. When light is placed over stones (Strontium titanate, YAG, GGG and CZ) immersed in di-iodomethane (methylene iodide; a high density liquid with a refractive index of 1.742) or Refractometer contact fluid (RI 1.81) different stones show differing patterns. All except strontium titanate show a dark ring diminishing in width as their refractive index approaches near to that of the liquid. This is a definite visual indication of differentiation between diamond and its simulant. This is the method gem testing labs will use.

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