Cut — The diamond shapes refer to its physical appearance, while diamond cuts refer to how well the diamond’s features interact with light. A rough diamond can be cut into any shape, but it takes skilled diamond cutters to perfect fancy shapes. Because a heart shaped diamond is a “fancy” cut, they have no official grade.
Clarity — Diamond clarity refers to the number of imperfections a diamond has. Each diamond has a different amount of these inclusions. The clarity grades for diamonds range from SI2 (having the largest amount) to VVS1 (having the least). Because of the shape and cut of heart diamonds, flaws will be obvious—but if a diamond you like seems flawless to you, your partner probably won’t be able to spot any blemishes either.
Color — When shopping for a diamond, you generally want to look for colorless diamonds. The color grading scale ranges from Z (containing the most color) to D (containing the least color). Heart diamonds do retain their color, so if you prefer a diamond to look white, choose a color close to D. If your significant other won’t mind a warmer stone, a diamond on the other end of the spectrum will work well.
Carat — One of the most important factors when it comes to heart diamonds is their carat weight. Heart shaped diamonds must be large enough for their distinctive shapes to be obvious; too small, and they will appear round. Often, halos can distract from the heart instead of making it look larger, so you want to make sure you like how a halo setting looks before deciding on it. By purchasing a lab grown diamond, you can save 20-30% on the price—enabling you to increase the carat size enough for the romantic shape to appear obvious.