---
title: "Hearts and arrows symmetry: meaning in gemology"
description: "Hearts and arrows symmetry is the share of a hearts and arrows pattern where all sixteen halves match. Our Hearts & Arrows Scope gives it as a whole percent…"
url: https://digitalgemology.com/learn/glossary/hearts-and-arrows-symmetry
image: https://digitalgemology.com/img/og-digital-gemology.png?v=d224fb01
---

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[Glossary](https://digitalgemology.com/learn/glossary) · How we measure

# Hearts and arrows symmetry

Also called H&A symmetry figure

Hearts and arrows symmetry is the share of a hearts and arrows pattern where all sixteen halves match. Our Hearts & Arrows Scope gives it as a whole percent for each view.

## In more detail

Proportions alone never lower it, because they change every half in the same way. Small faults do: in the T73 in diamond, mains up to 0.1° off give 90% face-up and 85% face-down. It differs from a report symmetry grade and from our light-performance symmetry score.

## How we measure it

We lay a polar grid of 32 angles by 96 radii over one half-sector. We trace each point in all 16 of its images. A point counts when all 16 show the same color, weighted by its radius. 100% means every point agrees.

## Related terms

- [Hearts and arrows](https://digitalgemology.com/learn/glossary/hearts-and-arrows): Hearts and arrows is a pattern that a precisely cut round brilliant shows in a reflector viewer. Face-up it shows eight arrows, and face-down eight hearts.
- [Hearts & Arrows Scope](https://digitalgemology.com/learn/glossary/hearts-and-arrows-scope): The Hearts & Arrows Scope is a free Digital Gemology tool that simulates a hearts and arrows viewer. It shows a round brilliant's arrows face-up and hearts face-down, with one symmetry figure per view.
- [Symmetry (light performance)](https://digitalgemology.com/learn/glossary/symmetry-light-performance): In our light-performance scores, symmetry measures how evenly the pavilion facets of each angle family are cut. It reads 100 when every facet in a family has the same angle and distance from the center.
- [Symmetry](https://digitalgemology.com/learn/glossary/symmetry): Symmetry is the report grade, from Excellent to Poor, for the exactness of a stone's outline. It also covers the shape, placement and alignment of the facets.

## Learn more

- [Hearts & Arrows Scope](https://digitalgemology.com/about/how-we-measure/hearts-and-arrows-scope)
- [Hearts & Arrows Scope](https://digitalgemology.com/tools/hearts-and-arrows-scope)

[All 328 terms](https://digitalgemology.com/learn/glossary)