some tips that will help you in buying a diamond.
1.Make SURE that the dealer will agree to send the stone out for you to have it checked by an independent gem lab and appraiser. This should be able to be arranged without you having to pay for the stone, till you pick it up, or its shipped. Remember though that seller’s do not want the diamonds they sell checked by an independent appraiser. Let them know you aren’t going to budge on this, and if they will not let send the stone to YOUR appraiser, you’ll find a new seller.
2.Regardless of how much you believe you know, do not trust your eyes in determining what diamond is better than the next. This is a job for the professional, as many details that need to be checked requires advanced gemological training and equipment the seller may not have. Just because seller tell you to TRUST YOUR EYES, don’t think untrained and inexperienced is appropriate in safely choosing a diamond. It ISN’T!
3.Strongly consider only a diamond with a GIA or AGS grading report. But be careful about the amount reliance you place in these certificates. Even though they are the “best” reputed labs, they make mistakes or sometimes overlook important characteristics. At best you get 1/2 the information you need. Check out our chart comparing what the leading labs report. You’ll see just how much information you could have to make a better decision about the stone your contemplating.
4.Sarin Cut Grading: The Sarin machine does NOT totally CUT grade diamonds. It does not grade SYMMETRY and POLISH. Symmetry and polish are very important to how well a diamond is finished, and while the information the Sarin reports is important, remember it still represents an AVERAGE, which can mislead you. The AGS grading system allows for a 2. degree variance ( from 33.7 -35.8 degree) and still issues a zero cut grade. Don’t rely on averages, get all eight crown angles, all eight pavilion main angles, and star/upper girdle ratio as well as the variances of the girdle thickness in specific locations.
5.Brilliance Scope: The Brilliance Scope by Gemex Systems. is a way of measuring the brilliance, dispersion and scintillation Click here for more information.
6.Consider the refund, buy back or credit policy of the seller. By having the seller send us the diamond to check it out, before you put up money, you won’t be limited to a short time in which to find an appraiser to check your stone.
7.Be very selective about the quality of the stone you want. Avoid compromising the standard you set.