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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (123): Octagon Shape 10x8 mm Gems Clear All
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ID: 4185001 pcs
3.40ct Topaz
9.76mm x 7.74mm x 4.81mm
USD 23.80
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ID: 4188352 pcs
7.38ctw Topaz
9.85mm x 7.92mm x 4.58mm
USD 51.66
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ID: 4051591 pcs
3.94ct Topaz
10.02mm x 8.04mm x 5.24mm
USD 27.38
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ID: 4387491 pcs
3.37ct Amethyst
10.03mm x 7.96mm x 5.69mm
USD 16.85
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ID: 3865392 pcs
7.70ctw Topaz
9.99mm x 8.03mm x 5.33mm
USD 38.50
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ID: 4188402 pcs
7.46ctw Topaz
9.92mm x 8.04mm x 4.83mm
USD 52.22
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ID: 4184821 pcs
3.75ct Topaz
9.96mm x 7.97mm x 4.74mm
USD 26.25
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ID: 3865912 pcs
7.43ctw Topaz
10.00mm x 7.96mm x 5.25mm
USD 37.15
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ID: 3864432 pcs
7.26ctw Topaz
9.99mm x 7.97mm x 5.03mm
USD 36.30
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ID: 4388181 pcs
3.10ct Amethyst
9.91mm x 7.93mm x 5.27mm
USD 15.50
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ID: 4188392 pcs
7.76ctw Topaz
9.96mm x 7.90mm x 5.46mm
USD 54.32
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ID: 4193262 pcs
6.93ctw Topaz
10.11mm x 7.95mm x 4.59mm
USD 48.51
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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: 3864442 pcs
7.63ctw Topaz
10.00mm x 8.03mm x 5.46mm
USD 38.15
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ID: 4388831 pcs
3.45ct Amethyst
10.17mm x 8.01mm x 5.89mm
USD 17.25
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ID: 4383211 pcs
3.17ct Amethyst
10.22mm x 8.25mm x 4.80mm
USD 15.85
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ID: 3865882 pcs
7.31ctw Topaz
10.00mm x 8.01mm x 5.34mm
USD 36.55
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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: 4184971 pcs
3.73ct Topaz
10.12mm x 7.93mm x 4.88mm
USD 26.11
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ID: 3864512 pcs
7.50ctw Topaz
9.95mm x 7.99mm x 5.21mm
USD 37.50
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ID: 4388821 pcs
3.39ct Amethyst
9.98mm x 7.83mm x 6.24mm
USD 16.95
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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