A Star Carat diamond is graded based on the same criteria as mined diamonds, which is the 4Cs Cut, Clarity, Colour and Carat. Each of these characteristics must be considered when choosing a Star Carat Diamond. The cut of a diamond determines its shape and proportion, which then affects how the diamond reflects light. The clarity of a Star Carat Diamond is judged on the number of blemishes or inclusions present. The fewer inclusions, the higher the clarity grade. The colour of a Star Carat Diamond is judged on a scale from D (no hue) to Z (a yellow-hued diamond). A diamond with no hue is rarer and deemed more valuable. Finally, carat is how much a Star Carat Diamond weighs.