I have been accredited by the Gemological Institute of America as an A.J.P. (Accredited Jewelry Professional) and have been certified by the Diamond Council of America in Diamonds and Colored Gemstones. IF you unsatisfied due to any reason please know of our 15 days full refund policy. Please feel free to email me or call me to resolve any issue in a positive manner before leaving any negative or neutral feedback. We appreciate your interest in our item and looking forward to do business with you soon