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You Selected (115): Octagon Shape 10x8 mm Gems Clear All
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ID: 4520411 pcs
thumb image of 4.1ct Octagon Step Cut Red Pyrope Garnet (ID: 452041)
4.07 ct Pyrope Garnet
10.1 x 8.1 mm
$ 40.70
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ID: 4520831 pcs
thumb image of 4.7ct Octagon Step Cut Red Pyrope Garnet (ID: 452083)
4.71 ct Pyrope Garnet
10 x 8.1 mm
$ 56.52
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ID: 4518921 pcs
thumb image of 4.9ct Octagon Step Cut Red Pyrope Garnet (ID: 451892)
4.87 ct Pyrope Garnet
10.1 x 7.9 mm
$ 58.44
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ID: 4528921 pcs
thumb image of 4.3ct Octagon Step Cut Red Pyrope Garnet (ID: 452892)
4.26 ct Pyrope Garnet
10 x 7.8 mm
$ 55.38
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ID: 4526401 pcs
thumb image of 4.2ct Octagon Step Cut Red Pyrope Garnet (ID: 452640)
4.18 ct Pyrope Garnet
9.9 x 7.9 mm
$ 54.34
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ID: 4519681 pcs
thumb image of 4.5ct Octagon Step Cut Red Pyrope Garnet (ID: 451968)
4.52 ct Pyrope Garnet
10 x 8.1 mm
$ 54.24
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ID: 4188392 pcs
thumb image of 7.8ct Octagon Facet Swiss Blue Topaz (ID: 418839)
7.76 ct Topaz
10 x 7.9 mm
$ 54.32
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ID: 4518881 pcs
thumb image of 4.5ct Octagon Step Cut Red Pyrope Garnet (ID: 451888)
4.50 ct Pyrope Garnet
10 x 7.9 mm
$ 54.00
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ID: 4526311 pcs
thumb image of 4.1ct Octagon Step Cut Red Pyrope Garnet (ID: 452631)
4.09 ct Pyrope Garnet
10.1 x 8 mm
$ 53.17
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ID: 4528871 pcs
thumb image of 4.1ct Octagon Step Cut Red Pyrope Garnet (ID: 452887)
4.05 ct Pyrope Garnet
10 x 7.8 mm
$ 52.65
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ID: 4526351 pcs
thumb image of 4ct Octagon Step Cut Red Pyrope Garnet (ID: 452635)
4.03 ct Pyrope Garnet
10 x 7.8 mm
$ 52.39
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ID: 4519671 pcs
thumb image of 4.3ct Octagon Step Cut Red Pyrope Garnet (ID: 451967)
4.29 ct Pyrope Garnet
10 x 8 mm
$ 51.48
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ID: 4420371 pcs
thumb image of 2.9ct Octagon Facet Bi-Color Ametrine (ID: 442037)
2.94 ct Ametrine
9.8 x 7.9 mm
$ 14.70
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ID: 4526421 pcs
thumb image of 3.9ct Octagon Step Cut Red Pyrope Garnet (ID: 452642)
3.93 ct Pyrope Garnet
10 x 8 mm
$ 51.09
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ID: 4518901 pcs
thumb image of 4.2ct Octagon Step Cut Red Pyrope Garnet (ID: 451890)
4.20 ct Pyrope Garnet
10.1 x 8.1 mm
$ 50.40
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ID: 4356191 pcs
thumb image of 3.1ct Octagon Facet Bi-Color Ametrine (ID: 435619)
3.07 ct Ametrine
10 x 7.8 mm
$ 15.35
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ID: 4518941 pcs
thumb image of 4.1ct Octagon Step Cut Red Pyrope Garnet (ID: 451894)
4.09 ct Pyrope Garnet
10.1 x 8.1 mm
$ 49.08
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ID: 4519651 pcs
thumb image of 4.1ct Octagon Step Cut Red Pyrope Garnet (ID: 451965)
4.09 ct Pyrope Garnet
10 x 8 mm
$ 49.08
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ID: 4526371 pcs
thumb image of 3.8ct Octagon Step Cut Red Pyrope Garnet (ID: 452637)
3.75 ct Pyrope Garnet
10 x 8.1 mm
$ 48.75
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ID: 4424221 pcs
thumb image of 3.2ct Octagon Facet Bi-Color Ametrine (ID: 442422)
3.15 ct Ametrine
10.1 x 8.1 mm
$ 15.75
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ID: 4418961 pcs
thumb image of 4ct Octagon Facet Bi-Color Ametrine (ID: 441896)
3.97 ct Ametrine
10.1 x 7.9 mm
$ 19.85
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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