Diamonds Certificates come from various Independent Gemologial Laboaratories such as GIA, IGI, EGL, AGS, etc. to show the purchaser quality and other criteria like weight, polish, symmetry, proportions, etc. of the diamond.
These independent labs make sure that buyer is getting exactly the diamond they are looking at. Lately these labs laser engrave the certificate number to the girdle of the diamond so with a 10X magnification you can verify it yourself.
When you look at a diamond under a microscope the color and clarity could look different to people so labs become the ultimate authority of the specification of the diamond.
Plus they are very useful when you are getting a diamond insured so that insurance company knows exactly what is insured. Almosy all certificates will not list the value of the diamond, for that you need an appraisal from an independent appraisal service.
Shenoa Diamonds