Diamond certificates are very important for loose diamonds. Diamond certificates are also called diamond grading reports. A diamond certificate will tell you the exact measurement and weight of the diamond. It will also give you detailed information about its cut and quality. All the individual characteristics of the stone are pointed out in the diamond certificate.

Certified loose diamonds are more valuable compared to uncertified loose diamonds. This is specially where the diamond certifying lab is a reputable one.

Diamond certification is different from a diamond appraisal. A certifcate describes the diamond and its qualities but it doesn't mention any price or place any value on the diamond.

Diamonds are certified by many diamond labs. Among these the Gemological Institute of America (GIA) and the American Gem Society (AGS) are the two most reputed diamond grading labs in the world.

There are many diamond grading labs and many of these come out with their own grading reports. Different labs have different grading and certifying standards. Some labs are very strict in diamond certifying while others are more lenient.

When shopping for loose diamonds, always look for certified loose diamonds. This will help you make an informed purchase.
You can compare different diamonds based on various criterion and price to ensure you're getting value for your money.