The diamond's shape is significant too, for more than just the obvious reasons. Early Christians spread the notion of the heart being the seat of our emotions, and in modern times the heart is considered a symbol of profound feelings and deep truth. What better statement to make with your ring, which in itself represents the profound bond between you and your partner?
Heart-shaped diamonds are a variation on the round brilliant cut. They are actually pear-shaped diamonds with a cleft at the top instead of a rounded edge. As with all diamonds, the beauty and value of the stone depend upon the skill of the cutter.
As in the case of pear-shaped diamonds, the actual shape (wide, elongated, etc.) can vary, but a heart-shaped diamond is considered more valuable if it's symmetrical; that is the diameter across its widest edges (the "shoulders" of the heart) should be equal to its length. Length is measured in a vertical line centered over the cleft and the tip of the stone.
Like all stones, the setting of your heart shaped diamond ring is a matter of choice and endless possibility; any way it's presented, the heart-shaped diamond exudes romance and admiration. You might opt for the simple elegance of a plain gold band, or offset your heart shaped diamond with other diamonds, or even mount it on an engraved band, flanked by two rubies (great for Valentine's Day).
The cost of a heart-shaped diamond is more or less the same as that of oval and pear shapes, usually 20 to 25 percent less than that of an identical round brilliant stone. You'll be able to afford more, but it's important to remember that bigger isn't always better, especially with a complex cut such as this one. Often, buying a smaller stone guarantees more quality craftsmanship for your money. Most reputable jewelers will look over several stones and take the time to explain their comparative values, rather than rushing you into a big sale (especially if you are the romantic type that would shop for a heart-shaped diamond).
The first thing to look for when examining a heart-shaped diamond is whether it is absolutely symmetrical. If it appears lopsided to the naked eye, it is poorly cut and not worth your money. Another warning sign of a poorly cut "fancy" shape diamond is the appearance of the bow tie effect, wherein you can see two dark-looking triangles joined at their tips appearing in the center of the stone. This is a result of light leaking from the pavilion (bottom portion of the diamond).
Choosing a heart shaped diamond engagement ring is the ultimate valentine for the love of your life, and a beautiful way to show her just how special she is to you. It will also be there for countless years to remind her that true romance never dies.