On the A2ZDiamond Web site, we make every attempt to ensure that our online catalog is as accurate and complete as possible based on the information received from our manufacturers so that you can see the beauty and shape of a particular item. In order to give you the opportunity to view our products in great detail, some products may appear larger or smaller than their actual size in our photographs or video; and since every computer monitor is set differently, color and size may vary slightly. For items containing multiple diamonds or gemstones, we list the average grade and measurement for color, clarity, and carat weight. These averages are calculated by adding all grades or measurements that comprise the inventory with regard to that particular piece of merchandise, and determining the closest mean. Please note that the total carat weight (ctw) of diamond solitaire pieces may vary from the listed carat weight by .01 to .05 carat. The total weight of multiple diamond or gemstone may vary between .01 to .05 carat from the listed carat weight. For any single diamond or multiple diamonds lot, the width and/or length stated in the item description is taken by us with Digital Measuring Caliper. Please note that the measurement of diamond or gemstone solitaire may vary from the listed measurement by 0.01 to 0.50 MM. The average measurement of multiple diamonds or gemstones lots have rounding and average size of measurement may vary between 0.01 to 0.50 MM from the listed measurement. We certify that your stones purchase is made with us are genuine diamonds and/or gemstones as per the quality promised by A2ZDiamond.