If you are in the market to buy diamonds, particularly loose diamonds, you will benefit from knowing the difference between certified and non-certified stones. After all, you want to make sure you are spending your money on a diamond that is actually worth it. Thus, understanding what being certified means for a diamond is crucial to buying the best quality of diamond that you can.
A diamond has a large markup in most stores and because of this a certification at least insures the buyer that when they pay a fortune they are getting quality. Without a certification the diamond ring could have inclusions covered up by injecting plastics and glass into the blemishes of the gem stone. The certification can also guarantee the quality of cut, color, and clarity of the diamond.
The Gemological Institute of America offers the most robust unbiased certification regarding the value of a diamond but many jewelery stores do not use them to save money. The cost to certify a diamond may cost $60 – $120 per stone and so this cost is not worth it to some stores. Take Sam’s Wholesale Club for instance, they use their own in house appraisal of their diamond rings which allows them to cut costs and still sale quality diamond rings. The problem is that since the Sam’s diamond ring is not certified by GIA people walk away wondering if the assertions about the quality of the diamond are accurate.
A diamond ring that is not certified by GIA is still valuable but the quality will never be completely understood to the buyer or potential buyers in the future. One reason you do not see diamond commodity exchanges is due to diamonds having large markups on them that make no sense to the reality of the market. The illusion of the expensive diamond ring continues to persist and a GIA certification offers a trust factor to this whole illusion.
A good way to buy a diamond ring that is not certified as GIA is to go with a store that has a return policy provided you buy a ring of 20 percent or greater value. Do your own research by inspecting the diamond up close and ask for a magnify glass. A diamond jewelery store should be able to accommodate all your requests about data and quality scores associated with the diamond and have very generous terms for returning a ring no longer wanted.
A certification is to insure the ring has a quality gem stone as being advertised. A GIA certification makes certain the quality of the ring as well as the price you pay. The americus diamond prices that are advertised on TV offer confidence because of their GIA certified rings. You can learn more about this here: diamond prices

