How to Tell if a Diamond is Real or Fake

• 

Where to find the girdle of a diamond
The girdle of your diamond runs around the outer edge between the upper crown facets and the lower pavilion facets. It is the thin outer edge, separating the upper part of the diamond from the lower section. The polished, faceted or bruited (matt) girdle includes the number applied microscopically.
https://www.jewelerstoolsmall.com/Diamond-Moissanite-Test...


Why is the GIA laser inscription useful?
Diamond merchants, jewellery retailers and manufacturers handle a large volume of certified diamonds weighing below 1 carat.

The problem with GIA laser inscriptions
We have already touched upon the microscopic size of the laser inscription. Tiny numbers pose a problem for many people who don’t have the knack or trained eye while using a 10x loupe.
https://www.jewelerstoolsmall.com/Diamond-Proportion-Scop...


What is the best magnification to view a diamond inscription?
Based on the magnification of the viewer we sell (see below), the magnification is 20x. It will always take a little time to set up to view the inscription but provided the number is not too faint, it should be visible at this magnification. For most people, a standard diamond loupe (10x) will struggle to provide enough magnification to read the full number.
https://www.jewelerstoolsmall.com/Jewelry-Loupes-Magnifie...