This kit helps you select the best looking top cut quality round diamonds. Easy to use backed up with the Reference Chart. Just sit any diamond next to the reference CZ on a white screen on any phone and compare them. The locking tweezers and spring gem holders are very useful and can be used with the glass lens loupe to check diamond inclusions or jewelry prongs. You can take pictures by placing a phone or point and click camera lens touching the lens of the Ideal-scope.