carat
Carat weight can appear differently across different diamond shapes such as round brilliant, princess, pear, oval, cushion, marquise, emerald, radiant or heart. A diamond may have a higher carat weight without appearing larger and two diamonds of the same carat weight can vary in size if one is cut deeper than the other. In other words, it is important to note that carat weight does not necessarily denote size.
This is especially true for Emerald Diamonds. The emerald cut is not as deep as for example a round diamond. Therefore, you may buy an emerald cut diamond that will appear bigger than, a round diamond that weighs the same. When shopping for emerald cut diamonds, compare sizes not carat weights.
color
Color refers to the natural tint inherent in white diamonds. In nature, most white diamonds have a slight tint of yellow. The closer to being “colorless” a diamond is, the rarer it is. The industry standard for grading color is to evaluate each diamond against a master set and assign a letter grade from “D” (colorless) to “Z” (light yellow).
Color is generally more noticeable in an Emerald Cut than in other diamond shapes. This is primarily because its large table and step cuts retain more color than other diamond shapes, allowing the eye to see the natural color of the stone.
clarity
Diamond clarity is a measure of the purity and rarity of the diamond, graded by the visibility of these characteristics under 10-power magnification. A diamond is graded as flawless if, under 10-power magnification, no inclusions (internal flaws) and no blemishes (external imperfections) are visible.
The step cut and the large table (top surface of a diamond) of an emerald diamond accentuate the diamond’s Clarity, making even the slightest flaws highly visible. Hence, making inclusions in the emerald diamond more noticeable than some of the other popular diamond shapes such as round diamond and cushion diamond
.