Hearts & Arrows

Introduction

Among round brilliant diamonds, one visual test has become shorthand for the highest level of cutting precision: the Hearts & Arrows pattern. Viewed through a specialised scope, a well-cut round brilliant reveals eight symmetrical arrows from the top and eight symmetrical hearts from the bottom — a kaleidoscopic signature that only appears when facets are aligned with extraordinary accuracy.

Hearts & Arrows (H&A) has become a powerful selling point, often presented as proof that a diamond is "super ideal." But the pattern is a symmetry indicator, not a comprehensive quality grade. Understanding what H&A actually measures — and what it does not — helps separate genuine craftsmanship from marketing leverage.

For the cut grade system that applies to all round brilliants, see Cut Grade Scale. For the proportions that drive light performance, see Proportions Primer.

Key Points

What the Pattern Looks Like

When a round brilliant is placed in an H&A viewer — a handheld scope that uses a coloured reflector to isolate the diamond's internal reflection pattern — two distinct images appear:

Pavilion view (face-down): Eight symmetrical hearts, formed by the overlap of opposing pavilion main facets and lower girdle facets. The hearts should be uniform in size and shape, with consistent "V" tops and rounded lobes across all eight.

Crown view (face-up): Eight symmetrical arrows radiating from the centre, created by the reflection pattern of the crown's main facets, star facets, and upper girdle facets. Shafts should be straight, evenly spaced, and extend cleanly from centre to edge.

In a true H&A diamond, both patterns are sharp and free of distortion. Asymmetries — a heart larger than its neighbours, an arrow shaft that bends — indicate facet misalignment.

What Produces the Pattern

The H&A pattern is not caused by special facets or a unique cut design. It emerges from the standard 57-facet round brilliant geometry when facet placement achieves a level of precision far beyond the industry norm.

Three factors must align simultaneously:

1. Facet-to-facet angular precision. Each pavilion main facet must be cut at virtually the same angle as the opposing facet. Deviations of even 0.3° between opposing facets distort the heart shape or arrow symmetry.

2. Azimuthal alignment. Facets must be spaced at exactly 45° intervals around the stone. If the angular spacing between facets is uneven, hearts and arrows appear different sizes or shift out of position.

3. Indexing consistency. The relationship between crown facets and pavilion facets must be precisely indexed — each crown facet must sit in correct rotational alignment relative to its corresponding pavilion facet below.

Standard production cutting, even when targeting GIA Excellent symmetry, does not routinely achieve this. A GIA Excellent symmetry grade tolerates minor deviations invisible to the naked eye but clearly visible in an H&A viewer. H&A demands optical-level precision beyond what the symmetry grade measures.

The H&A Viewer

An H&A viewer is a tube with a coloured reflector (typically red or pink) that blocks ambient light and shows only the diamond's internal reflections. Under these conditions, symmetrical patterns — or their absence — become immediately visible. The viewer exposes misalignments that brilliance and scintillation mask in normal lighting.

Common tools include the FireScope, IdealScope (which also evaluates light return), and proprietary brand viewers. When evaluating H&A images, look for:

• All eight hearts/arrows present and distinct
• Consistent size and shape across all eight positions
• Sharp boundaries without blurring or overlap
• No "broken" arrows or merged hearts

The "Super Ideal" Concept

"Super ideal" is trade terminology, not a laboratory grade. GIA does not use this term on any report. Neither do HRD or AGS. The term emerged in the retail and online diamond trade to describe round brilliants that combine a GIA Triple Excellent grade (Excellent cut, polish, and symmetry) with a confirmed H&A pattern.

IGI does issue a "Hearts & Arrows Ideal" designation on some reports, but this is an IGI-specific label and should not be confused with a universal standard. See Cut Grade Scale for how IGI and GIA scales differ.

The label, when used responsibly, points to a genuine subset: stones exceeding the highest laboratory grade in measurable symmetry precision. The problem is that the term is unregulated — any seller can apply it, and there is no industry-wide standard for qualification. Treat "super ideal" as a marketing category, not a technical grade. Evaluate the diamond on its grading report and H&A images independently.

When H&A Matters — and When It Does Not

H&A matters when:

• You value craftsmanship as part of the diamond's story — knowing the stone represents the cutter's highest precision.
• You are choosing among Triple Excellent diamonds and want an additional differentiator that confirms symmetry at the top of the Excellent range.
• The setting will not obscure the pattern — solitaires and simple settings where light behaviour is fully visible.

H&A matters less when:

• The diamond will sit in a halo or heavy pavé setting where surrounding stones diffuse the visual impact.
• You are optimising for value. H&A commands a 10–20% premium over comparable non-H&A Triple Excellent stones. That premium may be better allocated to carat weight or colour.
• The proportions are suboptimal. A diamond can show clean H&A while having angles outside the performance window. Always verify pavilion angle (40.6–41.0°) and crown angle (34.0–35.0°) on the grading report regardless of H&A status. See Light Performance Issues for what happens when proportions deviate.

Verifying H&A Claims

When a seller markets a diamond as Hearts & Arrows:

1. Request H&A images. Both pavilion (hearts) and crown (arrows) photographs through an H&A viewer. One view alone is insufficient.
2. Check symmetry grade. GIA Excellent symmetry is the minimum. Very Good symmetry is unlikely to produce a true H&A pattern.
3. Evaluate critically. Eight distinct, uniform, sharp patterns in both views. Marketing photos can be selectively lit — view through an H&A scope in person when possible.
4. Verify proportions separately. H&A without good proportions is precision without purpose.

Under Czech consumer protection law, product descriptions must be verifiable. A diamond described as "Hearts & Arrows" should be demonstrably so — if the seller cannot provide H&A viewer images, the claim is unsubstantiated.

Summary

Hearts & Arrows is the visible signature of extreme optical symmetry — a confirmation that facets are aligned with precision exceeding what even the highest symmetry grades demand. When combined with optimal proportions, H&A identifies some of the finest-performing round brilliants available.

But it is a symmetry test, not a comprehensive quality assessment. A diamond can display clean hearts and arrows while underperforming on light return if its angles are wrong. Evaluate H&A diamonds the same way you evaluate any diamond: grading report first, images second, marketing claims last. The pattern is a valuable data point. It is not the whole story.