Octagon, emerald cut, faceted gemstone, mm to carat conversion chart.

Emerald (octagon) cut gemstone carat weight conversion chart.
Millimeter size to carat weight conversions for faceted octagon cut Gemstones.

This chart depicts optimum weights for octagon cut gemstones. Actual weights may vary due many factors related to the best recovery of raw material as accessed by a skilled lapidary.

In jewelry the primary goal is to calibrate the overall size for fit. See calibrated Gems to learn why. Use gemstone cut charts as a guide noting actual weights may vary within 10 percent.

Emerald (octagon) Faceted Gemstone Weight Chart (approximate weights)
	5x3 mm	6x4 mm	7x5 mm	8x6 mm	9x7 mm	10x8 mm	11x9 mm	12x10 mm	14x10 mm
Alexandrite	.40 ct	.70 ct	1.30 ct	2.60 ct	3.60 ct	4.20 ct	6.00 ct	8.50 ct	9.90 ct
Amethyst	.35 ct	.55 ct	1.00 ct	1.60 ct	2.25 ct	2.90 ct	4.20 ct	5.60 ct	7.25 ct
Aquamarine	.25 ct	.50 ct	.80 ct	1.40 ct	2.00 ct	3.00 ct	4.30 ct	4.75 ct	7.75 ct
Citrine	.35 ct	.55 ct	1.00 ct	1.60 ct	2.25 ct	2.90 ct	4.20 ct	5.60 ct	7.25 ct
Diamond	.25 ct	.50 ct	1.00 ct	1.50 ct	3.00 ct	4.00 ct	5.00 ct	7.80 ct	8.80 ct
Emerald	.30 ct	.60 ct	.90 ct	1.80 ct	2.31 ct	3.15 ct	4.50 ct	5.25 ct	5.80 ct
Garnet	.40 ct	.80 ct	1.20 ct	1.70 ct	2.50 ct	3.50 ct	4.30 ct	6.35 ct	9.00 ct
Peridot	.35 ct	.60 ct	1.00 ct	1.70 ct	2.25 ct	3.80 ct	5.25 ct	6.25 ct	8.80 ct
Ruby	.55 ct	.75 ct	1.15 ct	1.60 ct	2.30 ct	2.75 ct	4.00 ct	6.25 ct	9.00 ct
Sapphire	.55 ct	.75 ct	1.15 ct	1.75 ct	2.30 ct	2.75 ct	4.00 ct	6.25 ct	9.00 ct
Topaz	.40 ct	.65 ct	1.25 ct	2.40 ct	3.40 ct	4.00 ct	5.75 ct	8.00 ct	9.50 ct
Tourmaline	.30 ct	.60 ct	1.60 ct	2.15 ct	2.80 ct	3.60 ct	4.30 ct	5.20 ct	8.50 ct
Zircon	.60 ct	.85 ct	1.70 ct	2.35 ct	3.90 ct	4.50 ct	6.20 ct	7.01 ct	8.95 ct

Carat conversion charts for gemstones.
Marquise cut gems, Octagon (emerald) cut chart,
Oval cut chart, Pear shape gems, Round cut gems,
Round diamond carat conversion chart

For more diamond information. Visit our "Four C's diamond grading chart".
Find more gemstone information. Visit our "Gemstone" index.

Shipping Continuous United States, Alaska and Hawaii.

Prices in US Dollars subject to change without notice.