by Gloria » Oct 4, 2000 Would you be so kind to recommend to me some of the most reliable places where I could purchase a quality diamond at competitive prices?I am looking for a GIA cert., radiant diamond, aprox. half carat, with great cut and color. It will be on a solitaire setting.Also, do these companies accept trade-ins? I have an almost new, beautiful 18-karat yellow gold ring with a 0.25 ct., certified brilliant diamond, with appraisal certificate. It comes on a tension setting, from Stern Jewelers, International. I never wear it, and would rather someone else enjoyed it. Plus it would help lower the price of the radiant one I am looking for...I really appreciate any expert advise.Thank you very much!