All of the loose diamonds, color stones, and finished merchandise is 100% fully guaranteed. If there is a discrepancy, the merchandise is returnable for 20 days from when you sign for them as evidenced by your returned receipt. Appraisals must be provided by an independent graduate gemologist, not a jeweler. We do not charge shipping on completed sales inside the US. On items sold outside of the US there is a shipping charge. On returned merchandise, the customer will be charged with shipping. We guarantee the authenticity of all Diamond certifications from EGL, GIA, and AGS. These independent third party appraisers of Diamond quality, double and triple check the grading of each Diamond.