Diamonds · 3 min read
Heart Shaped Diamonds: Why Symmetry Is the Defining Factor
A heart shaped diamond's appeal rests almost entirely on how evenly its two lobes and center cleft are balanced, making symmetry review especially important.
Why Symmetry Dominates Heart Cut Evaluation
The heart shape is one of the most visually distinctive and geometrically demanding fancy cuts, requiring two rounded lobes, a defined center cleft, and a bottom point to all align symmetrically for the shape to read clearly as a heart rather than an irregular outline. Because of this, symmetry plays an outsized role in how a heart cut diamond is perceived compared to many other shapes.
GIA reports for heart shaped diamonds include a Symmetry grade, but this grade reflects facet-level precision rather than a holistic assessment of whether the overall heart outline looks balanced to the eye, so visual review remains important alongside the report.
The Cleft and Lobe Balance
The cleft, the indentation between the two lobes at the top of the heart, needs to be neither too shallow, which can make the shape look more like a rounded oval, nor too deep, which can create a weak point structurally and visually exaggerate the indentation. Similarly, the two lobes should appear even in size and curvature.
Because these are matters of overall outline balance rather than facet symmetry alone, examining the stone face-up, ideally against a plain background, is a practical way to judge whether the cleft and lobes appear proportionate before purchase.
No Overall Cut Grade for Heart Shapes
As with other fancy shapes, GIA does not assign an overall Cut grade to heart shaped diamonds, meaning there is no single letter grade summarizing brightness, fire, and scintillation for this shape. The GIA report will include Polish and Symmetry grades, but these do not capture the full visual impression of outline balance.
Buyers should treat the GIA report as providing clarity, color, and some facet-level quality information, while relying on direct visual inspection for assessing the overall heart silhouette.
Bow-Tie Effect in Heart Shapes
Heart shaped diamonds, due to their elongated lower portion tapering to a point, can exhibit a bow-tie effect similar to other elongated fancy shapes, appearing as a shadow across the lower center of the stone. The severity varies by individual stone and cutting choices, and there is no formal grading scale to quantify it.
Viewing the stone under a few different lighting setups can help assess whether any bow-tie present is subtle or more visually distracting.
Point Protection Similar to Pear Shapes
The bottom point of a heart shaped diamond is structurally similar to the tip of a pear shape and carries similar vulnerability to chipping if not adequately protected in the setting. A V-prong or similar design cupping the point is commonly used to address this.
Buyers should ask their jeweler how the point will be protected in the chosen setting and consider examining the point area under magnification for any pre-existing chips or inclusions before purchase.
Practical Buying Steps for Heart Shapes
Viewing the stone face-up to assess cleft depth, lobe balance, and overall outline symmetry, combined with reviewing the GIA report for Clarity, Color, Polish, and Symmetry, gives a more complete picture than report data alone. Requesting video under multiple lighting conditions can help assess bow-tie presence as well.
Riakoob recommends verifying the GIA report number through official channels and discussing point protection with the jeweler, particularly for rings intended for daily wear.
Further reading & references
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