Peace-of-Mind...No Extra Charge. When it comes to pearls, comparison shopping for price and quality has always been nearly impossible for the layman. As a result, many jewelers have considered pearls a major profit center. Now...Capetown Sheds Light on a Blind Item. All of our pearls are submitted for independent evaluation to the International Gemmological Institute. A certificate of authenticity has been issues, stating the quality of each and every pearl jewelry item, based on I.G.I's pearl gradation from A-, A, AA, AAA, EXTRA FINE TO GEM.