Clarity is a measure of the number and size of the tiny imperfections that occur in almost all diamonds.
Many of these imperfections are microscopic, and do not affect a diamond's beauty in any discernible way.
Clarity simply refers to the tiny, natural imperfections that occur in all but the finest diamonds. Gemologists refer to these imperfections by a variety of technical names, including blemishes and inclusions, among others.
Diamonds with the least and smallest imperfections receive the highest clarity grades. Because these imperfections tend to be microscopic, they do not generally affect a diamond's beauty in any discernible way.
"eye-clean" diamond is the one that has no imperfections visible to the unaided-eye through the facu-up.
Cut is a diamond's most important characteristic. It has the greatest overall influence on a diamond's beauty. It determines what we generally think of as sparkle.
A diamond's cut grade is an objective measure of a diamond's light performance, or, what we generally think of as sparkle. When a diamond is cut with the proper proportions, light is reflected back to the top of the diamond. If it is cut too shallow, light leaks out of the bottom; too deep and it escapes out of the side.
Carat is specifically a measure of a diamond's weight A one-carat diamond is comprised of 100 points called cents . Hence, 50 cents is equal to 1/2-carat, and so on.
Most of the time ,value of the diamond increases with increase in Carat size.
Color refers to a diamond's lack of color, grading the whiteness of a diamond.
A color grade of D is the highest possible, while Z is the lowest.