3D model · 114 facets · 7.02 x 6.93 mm
The heart brilliant: a pear-like brilliant with a cleft at the top that divides it into two lobes. The cleft and the symmetry of the two lobes decide if the shape succeeds or fails.
Instant download · Personal-use license · What is in the files · Grade it in 3D
Drag to turn
The heart brilliant: a pear-like brilliant with a cleft at the top that divides it into two lobes. The cleft and the symmetry of the two lobes decide if the shape succeeds or fails.
Jewelers use it for pendants, gifts and statement rings.
Measured from the delivered model, not quoted from a standard.
We do not measure brilliance, fire and scintillation for the Heart Cut: our census traces convex stones, and the notch of the heart makes it concave.
The same geometry behaves differently in every material. Light that meets a pavilion facet at less than the critical angle of the stone does not reflect. It passes straight out of the back and shows face-up as a window. For each stone, we measured how much of the pavilion of this model, seen face-down, is steeper than that angle. We also measured what the model weighs at its reference size.
| Stone | Refractive index | Critical angle | Pavilion reflecting head-on light | Weight at this size | Verdict |
|---|---|---|---|---|---|
| Diamond | 2.417 | 24.4° | 100% | 1.52 ct | Holds head-on light |
| Moissanite | 2.648 to 2.691 | 22.2° | 100% | 1.39 ct | Holds head-on light |
| Cubic Zirconia | 2.15 to 2.18 | 27.7° | 100% | 2.50 ct | Holds head-on light |
| Ruby | 1.762 to 1.770 | 34.6° | 97% | 1.73 ct | Minor windowing |
| Sapphire | 1.762 to 1.770 | 34.6° | 97% | 1.73 ct | Minor windowing |
| Emerald | 1.577 to 1.583 | 39.4° | 79% | 1.17 ct | Steepen the pavilion |
| Amethyst | 1.544 to 1.553 | 40.4° | 79% | 1.14 ct | Steepen the pavilion |
Head-on light, first reflection. The 3D Gemstone Simulator traces the full Light Return in each of these gemstones.
Open it in the 3D Gemstone Simulator. Set its carat, color, clarity and cut grade in any of seven gemstones. Turn it under ten kinds of light, and watch its 3D gemstone report change as you go. Free, in your browser.
Six formats. STEP is the exact faceted solid for CAD, and 3DM is for Rhino. STL and OBJ are meshes. FBX is for Blender, 3ds Max, Maya, Cinema 4D, Unity and Unreal. GLB is for the web and AR. All are in millimeters at real-world scale, with 114 planar facets.
The faceting design for the Heart Cut is in preparation. It will contain a GemCad file, a tier table and a printable diagram. The 3D files are available now.
We measured the pavilion of this model against the critical angle of each stone. In Diamond, Moissanite, Cubic Zirconia, the whole pavilion reflects head-on light. In Emerald, Amethyst, part of the pavilion lets light out of the back, so we advise a steeper pavilion.
The cutting file for the Heart Cut is in preparation. Before a cutting file goes on sale, we check it facet by facet against its 3D model.
The model measures 7.02 x 6.93 x 4.63 mm, which is 1.52 ct in diamond. At the same size, it weighs 1.39 ct in moissanite, 2.50 ct in cubic zirconia, 1.73 ct in ruby, 1.73 ct in sapphire, 1.17 ct in emerald, 1.14 ct in amethyst. You can scale it uniformly to any size: the weight follows the cube of the size.
Yes. The mesh is watertight and manifold, with outward normals and no duplicate vertices, so it prints and casts without repair. Use the STEP file when you need the exact faceted solid in CAD.
The Heart Cut as exact geometry: 114 planar facets, real-world scale, ready for CAD, rendering, printing and casting.
The faceting design for the Heart Cut is in preparation. It will include the GemCad file, the tier table and a printable diagram.
Save with a bundle: the Heart Cut 3D files are also in Jewelry Essentials 3D, 10 cuts for €29.99 until 1 December, then €39.99 (€99.90 as single files). Buy the bundle.
Not sure the files open in your software? Get the cube free: the same six formats, for your email address, used only to send them (privacy).
Questions before you buy? Email us.