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You Selected (143): Octagon Shape 10x8 mm Gems Clear All
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ID: 4385671 pcs
thumb image of 3.3ct Octagon Facet Violet Amethyst (ID: 438567)
3.29ct Amethyst
9.97 x 8.09 x 5.67mm
USD 16.45
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ID: 4396041 pcs
thumb image of 2.5ct Octagon Facet Yellow Golden Citrine (ID: 439604)
2.48ct Citrine
9.92 x 7.95 x 4.29mm
USD 17.36
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ID: 4275301 pcs
thumb image of 3.7ct Octagon Facet Bi-Color Ametrine (ID: 427530)
3.72ct Ametrine
9.86 x 7.99 x 5.65mm
USD 22.32
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ID: 3865882 pcs
thumb image of 7.3ct Octagon Facet White Topaz (ID: 386588)
7.31ct Topaz
10.00 x 8.01 x 5.34mm
USD 36.55
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ID: 4382681 pcs
thumb image of 3.7ct Octagon Facet Violet Amethyst (ID: 438268)
3.69ct Amethyst
10.01 x 8.06 x 5.93mm
USD 18.45
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ID: 3865852 pcs
thumb image of 7.1ct Octagon Facet White Topaz (ID: 386585)
7.14ct Topaz
9.99 x 8.01 x 5.17mm
USD 35.70
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ID: 4422611 pcs
thumb image of 4.1ct Octagon Facet Swiss Blue Topaz (ID: 442261)
4.11ct Topaz
10.05 x 8.05 x 5.71mm
USD 26.59
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ID: 4423012 pcs
thumb image of 7.6ct Octagon Facet Swiss Blue Topaz (ID: 442301)
7.57ct Topaz
9.92 x 8.23 x 5.01mm
USD 48.98
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ID: 4193262 pcs
thumb image of 6.9ct Octagon Facet Swiss Blue Topaz (ID: 419326)
6.93ct Topaz
10.11 x 7.95 x 4.59mm
USD 48.51
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ID: 4193212 pcs
thumb image of 7.3ct Octagon Facet Swiss Blue Topaz (ID: 419321)
7.29ct Topaz
10.00 x 7.94 x 4.77mm
USD 51.03
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ID: 4185021 pcs
thumb image of 3.5ct Octagon Facet Swiss Blue Topaz (ID: 418502)
3.51ct Topaz
9.73 x 7.80 x 5.05mm
USD 24.57
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ID: 3865862 pcs
thumb image of 6.9ct Octagon Facet White Topaz (ID: 386586)
6.85ct Topaz
10.02 x 7.99 x 4.69mm
USD 34.25
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ID: 4184821 pcs
thumb image of 3.8ct Octagon Facet Swiss Blue Topaz (ID: 418482)
3.75ct Topaz
9.96 x 7.97 x 4.74mm
USD 26.25
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ID: 3864482 pcs
thumb image of 7.8ct Octagon Facet White Topaz (ID: 386448)
7.75ct Topaz
10.00 x 7.95 x 5.43mm
USD 38.75
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ID: 4423022 pcs
thumb image of 7.9ct Octagon Facet Swiss Blue Topaz (ID: 442302)
7.87ct Topaz
10.02 x 8.02 x 5.13mm
USD 50.92
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ID: 4382701 pcs
thumb image of 3ct Octagon Facet Violet Amethyst (ID: 438270)
3.04ct Amethyst
9.93 x 7.99 x 5.40mm
USD 15.20
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ID: 3862922 pcs
thumb image of 7.5ct Octagon Facet White Topaz (ID: 386292)
7.50ct Topaz
9.98 x 7.98 x 5.32mm
USD 37.50
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ID: 3862872 pcs
thumb image of 7.6ct Octagon Facet White Topaz (ID: 386287)
7.59ct Topaz
10.03 x 8.08 x 5.26mm
USD 37.95
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ID: 4417801 pcs
thumb image of 4.8ct Octagon Facet Bi-Color Ametrine (ID: 441780)
4.78ct Ametrine
10.18 x 8.28 x 6.62mm
USD 23.90
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ID: 4385661 pcs
thumb image of 3.5ct Octagon Facet Violet Amethyst (ID: 438566)
3.53ct Amethyst
10.18 x 8.02 x 5.31mm
USD 17.65
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ID: 4419761 pcs
thumb image of 3.8ct Octagon Facet Bi-Color Ametrine (ID: 441976)
3.76ct Ametrine
10.08 x 7.89 x 6.37mm
USD 18.80
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Octagon Shape 10x8 mm Gems
Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Octagon shape / Emerald-Cut, faceted and cabochon gems available now in 10 x 8 mm size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart