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You Selected (150): Octagon Shape 10x8 mm Gems Clear All
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ID: 4192822 pcs
thumb image of 7.9ct Octagon Facet Swiss Blue Topaz (ID: 419282)
7.88ct Topaz
10.00 x 8.04 x 5.41mm
USD 55.16
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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: 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: 4388191 pcs
thumb image of 2.8ct Octagon Facet Violet Amethyst (ID: 438819)
2.82ct Amethyst
10.04 x 8.00 x 4.78mm
USD 14.10
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ID: 4188362 pcs
thumb image of 7.9ct Octagon Facet Swiss Blue Topaz (ID: 418836)
7.91ct Topaz
9.73 x 7.90 x 5.50mm
USD 55.37
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ID: 4388851 pcs
thumb image of 3.2ct Octagon Facet Violet Amethyst (ID: 438885)
3.15ct Amethyst
9.90 x 8.01 x 5.60mm
USD 15.75
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ID: 4423071 pcs
thumb image of 4ct Octagon Facet Swiss Blue Topaz (ID: 442307)
4.01ct Topaz
10.10 x 8.09 x 5.67mm
USD 25.94
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ID: 3865472 pcs
thumb image of 7.8ct Octagon Facet White Topaz (ID: 386547)
7.77ct Topaz
9.98 x 7.96 x 5.55mm
USD 38.85
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ID: 4052871 pcs
thumb image of 3.7ct Octagon Facet Swiss Blue Topaz (ID: 405287)
3.66ct Topaz
10.00 x 7.98 x 4.78mm
USD 25.44
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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: 4387471 pcs
thumb image of 3.7ct Octagon Facet Violet Amethyst (ID: 438747)
3.67ct Amethyst
10.07 x 8.14 x 6.39mm
USD 18.35
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ID: 4051591 pcs
thumb image of 3.9ct Octagon Facet Swiss Blue Topaz (ID: 405159)
3.94ct Topaz
10.02 x 8.04 x 5.24mm
USD 27.38
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ID: 4388841 pcs
thumb image of 3.2ct Octagon Facet Violet Amethyst (ID: 438884)
3.17ct Amethyst
10.00 x 7.93 x 5.32mm
USD 15.85
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ID: 4427451 pcs
thumb image of 4.4ct Octagon Facet Swiss Blue Topaz (ID: 442745)
4.36ct Topaz
10.07 x 8.09 x 5.71mm
USD 28.21
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ID: 4184912 pcs
thumb image of 7.8ct Octagon Facet Swiss Blue Topaz (ID: 418491)
7.77ct Topaz
9.83 x 7.86 x 5.37mm
USD 54.39
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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: 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: 4413351 pcs
thumb image of 4.5ct Octagon Facet Bi-Color Ametrine (ID: 441335)
4.48ct Ametrine
10.40 x 7.98 x 5.98mm
USD 22.40
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ID: 4418431 pcs
thumb image of 4.8ct Octagon Facet Bi-Color Ametrine (ID: 441843)
4.82ct Ametrine
9.78 x 8.05 x 7.43mm
USD 24.10
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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: 4396071 pcs
thumb image of 2.7ct Octagon Facet Yellow Golden Citrine (ID: 439607)
2.65ct Citrine
9.85 x 7.90 x 4.70mm
USD 18.55
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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