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Arthur’s is one of a few stores in the United States and the only store in Minnesota with a complete diamond grading lab. We have invested in the latest state-of-the-art diamond grading computers to accurately grade our diamonds. Most jewelers rely on their eyes and imprecise tools to measure their diamonds, which can lead to the improper grading of their diamonds.
At Arthur’s, we use the OGI Megascope. The Megascope is a computerized proportion analyzer that accurately measures a diamond and is able to precisely assess the cut grade. Most jewelers only use a simple millimeter gage to evaluate the dimensions of their diamonds.
The Megascope takes 144 pictures of every diamond. While photographing the diamond it measures: the weight, diameter, crown angle and height, pavilion angle and depth, culet size, table size, total depth, girdle thickness, and symmetry of the diamond. The Megascope measures all 58 facets of the diamond and symmetry providing the overall cut grade of the diamond (0-10). | 
