Material: S925 Silver Style: Square Wrap Style Synthetic Moissanite Main Stone type:0.5 karat/diameter 5.2mm, 1 karat/diameter 6.6mm Type: Certified high grade synthetic moissanite. It's color grade is D, clarity grade is VVS1, cut grade is E, Superflash synthetic moissanite. Special note: The specification of 0.5 carat and above is equipped with certificate, the specification o'f below 0.5 carat is not equipped with certificate 【Special attention】1. Before purchasing, it is recommended to measure the size of your ring accurately. The ring sizes in the purchase options are marked with numbers for the American standard sizes and letters for the corresponding British and European sizes.2. How to choose the right ring size for yourself? Method One, use a dedicated ring size measuring tool; Method Two: Use a rope wrap around your finger, then measure the circumference of this circle with a ruler, and then find your own size according to the following table. Method Three: Measure the inner diameter of your existing ring with a ruler, and then find your own size according to the following table.3. After receiving the ring, if you find it too small, please do not force yourself to wear it to avoid injuring your fingers. We support a 30-day return and refund policy for received products. If the ring gets stuck, you can apply soapy water or lubricating oil to your finger to help remove it.4. The following are the ring size tables corresponding to each country.