Standard Round Brilliant - Facet and Design Data

Oct 26, 2026

Upload by Fishy

This technical document provides detailed facet and design specifications for a standard round brilliant gemstone cut. It outlines the geometric configuration, including the arrangement and counts of pavilion, girdle, and crown facets, totaling 73 facets across 7 tiers. The content includes critical size data ratios, such as L/W, P/W, H/W, and C/W, alongside specific indexing angles and gear settings for faceting machines using a refractive index of 1.54. It serves as a precise reference for lapidary artists and gem cutters to achieve consistent symmetry and proportion in the cutting process.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages1

Reading Time3 min

AccessFree to download

Facet and Size Specifications

Facet Configuration

Size Data

Design and Indexing Data

Pavilion Angle Settings

Crown Angle Settings

FAQs

What is the total facet count for this standard round brilliant design?

The design features a total of 73 facets across 7 tiers.

What refractive index (R.I.) is this design optimized for?

The facet angles and data are calculated for a refractive index of 1.54.

How are the pavilion facets distributed in this cut?

The pavilion consists of 24 facets arranged across 2 tiers, with specific indexing at 96 gear settings.

Oct 26, 2026

Upload by Fishy