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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (99): Octagon Shape 10x8 mm Gems Clear All
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ID: 4051641 pcs
4.05ct Topaz
10.03mm x 7.98mm x 5.38mm
USD 28.15
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ID: 4051631 pcs
3.47ct Topaz
9.94mm x 8.00mm x 5.03mm
USD 24.12
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ID: 4354031 pcs
4.20ct Ametrine
10.40mm x 8.04mm x 6.00mm
USD 21.00
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ID: 4356191 pcs
3.07ct Ametrine
9.95mm x 7.80mm x 4.78mm
USD 15.35
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ID: 3862892 pcs
7.35ctw Topaz
9.99mm x 7.98mm x 5.07mm
USD 36.75
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ID: 4051621 pcs
3.52ct Topaz
9.97mm x 8.11mm x 4.58mm
USD 24.46
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ID: 3864502 pcs
7.19ctw Topaz
9.99mm x 8.01mm x 4.95mm
USD 35.95
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ID: 4184922 pcs
7.53ctw Topaz
9.85mm x 7.83mm x 4.98mm
USD 52.71
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ID: 4193672 pcs
7.57ctw Topaz
9.89mm x 7.89mm x 4.99mm
USD 52.99
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ID: 4188332 pcs
7.26ctw Topaz
9.68mm x 7.88mm x 5.34mm
USD 50.82
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ID: 4184902 pcs
8.18ctw Topaz
9.85mm x 7.82mm x 5.51mm
USD 57.26
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ID: 3864492 pcs
7.29ctw Topaz
10.04mm x 7.97mm x 5.18mm
USD 36.45
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ID: 4185011 pcs
3.80ct Topaz
10.15mm x 8.05mm x 5.30mm
USD 26.60
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ID: 3865862 pcs
6.85ctw Topaz
10.02mm x 7.99mm x 4.69mm
USD 34.25
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ID: 4193242 pcs
8.38ctw Topaz
9.90mm x 7.94mm x 5.75mm
USD 58.66
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ID: 4188362 pcs
7.91ctw Topaz
9.73mm x 7.90mm x 5.50mm
USD 55.37
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ID: 4184781 pcs
4.04ct Topaz
10.13mm x 7.97mm x 5.26mm
USD 28.28
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ID: 3868041 pcs
3.44ct Topaz
9.98mm x 7.97mm x 4.98mm
USD 17.20
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ID: 4192822 pcs
7.88ctw Topaz
10.00mm x 8.04mm x 5.41mm
USD 55.16
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ID: 4184862 pcs
6.81ctw Topaz
9.90mm x 7.82mm x 4.69mm
USD 47.67
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ID: 4125041 pcs
3.17ct Aquamarine
9.83mm x 8.05mm x 5.39mm
USD 266.28
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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