The concept of the 4 C's (Cut, Colour, Clarity and Carat Weight) is used Internationally in order to group the specific characteristics for Diamonds.
Cut enables a Diamond to make the best use of light. A well cut diamond is the work of a master Diamond Cutter. When cut to good proportions, a diamond will handle light better resulting in more brilliance. A well cut Diamond occurs when light enters through the crown and is reflected from one facet to another and then dispersed through the top of the stone. (Diagram A) If the Diamond is cut too deep, some of the light entering the diamond is reflected but escapes through the pavilion. (Diagram B) If the Diamond is cut too shallow, some of the light entering the Diamond escapes through the pavilion before it can be reflected. (Diagram C)
|Ideal||: Diamonds cut to "Ideal" proportions. Maximum beauty is yielded with these proportions.|
|Very Good||: Diamonds cut just very slightly outside of "ideal" proportions.|
|Good||: Diamonds cut noticeably outside "ideal" proportions but above average.|
|Medium||: Diamonds cut to average proportions with somewhat noticeably reduced brilliance.|
|Fair||: Diamonds cut to somewhat below average proportions with reduced brilliance and noticeable cutting flaws.|
|Poor||: Diamonds cut well below average proportions with distinctively reduced brilliance and noticeable cutting irregularities to the untrained eye.|