Sometimes we get asked by a customer if the stone that they found tucked at the bottom of their jewellery box is a real diamond or not.

One very quick way to rule out many fakes is to try the newspaper test. Diamonds are highly dispersive, and have a high refractive index. This means that they bend and break up light very well, more than many other stones that are sometimes mistaken for a real diamond.

To do the test, simply place the diamond face down on a piece of newspaper text. See if you can read the text through the diamond. In the first photo, a piece of glass is shown. The text is clearly legible, as glass only barely bends light.

In the second photo, we have a diamond simulant, cubic zirconia. The text can still be clearly read.

 

Finally, a diamond. The text cannot be read through the stone.

Please note that this text is a good rule of thumb, but only works with modern round brilliant cut diamonds, and is not definitive; unusual or non-standard cut proportions can be misleading! If in doubt, have the stone appraised by a professional gemmologist.

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close