GIE Labs Logo

The GIE Labs ensures for providing
best treatments of Gemstone and Diamond testing with Certification

Stone Informatics

Quick reference for common gemstones — typical RI / SG / Mohs & colors.

Diamond Weight Chart

Approximate carat weights for given size and depth (trade constants). Adjust depth below.

Range: 1.0 mm → 12.0 mm (step 0.1)
Size (mm) Round Oval Princess Emerald Cushion Pear/Marquise
Indicative only; actual weight varies with table, girdle, crown/pavilion. Assumed L:W — Oval≈1.30, Emerald≈1.35, Cushion≈1.10, Pear/Marquise≈1.60.

Diamond & Moissanite Size Calculator

Do either: (A) enter size to get weight, or (B) enter weight to get size.

Diamond (SG≈3.52)
Weight: —
— mm— % depth
Moissanite (SG≈3.22)
Weight: —
— mm— % depth

Gallery

  • Gemstone sample 1
  • Gemstone sample 2
  • Gemstone sample 3