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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (129): Octagon Shape 10x8 mm Gems Clear All
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ID: 4383211 pcs
3.17ct Amethyst
10.22 x 8.25 x 4.80mm
USD 15.85
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ID: 4184862 pcs
6.81ctw Topaz
9.90 x 7.82 x 4.69mm
USD 47.67
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ID: 4188392 pcs
7.76ctw Topaz
9.96 x 7.90 x 5.46mm
USD 54.32
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ID: 4396061 pcs
3.05ct Citrine
10.15 x 7.69 x 4.77mm
USD 21.35
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ID: 3865842 pcs
7.28ctw Topaz
9.97 x 7.92 x 5.39mm
USD 36.40
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ID: 4193292 pcs
7.46ctw Topaz
9.78 x 7.85 x 4.96mm
USD 52.22
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ID: 4383201 pcs
2.97ct Amethyst
9.76 x 7.79 x 5.28mm
USD 14.85
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ID: 4193682 pcs
7.71ctw Topaz
9.82 x 7.96 x 5.45mm
USD 53.97
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ID: 3864402 pcs
7.55ctw Topaz
9.99 x 8.02 x 5.30mm
USD 37.75
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ID: 3864422 pcs
7.50ctw Topaz
9.89 x 7.89 x 5.39mm
USD 37.50
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ID: 4396091 pcs
2.87ct Citrine
10.02 x 8.03 x 5.10mm
USD 20.09
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ID: 4185001 pcs
3.40ct Topaz
9.76 x 7.74 x 4.81mm
USD 23.80
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ID: 3862922 pcs
7.50ctw Topaz
9.98 x 7.98 x 5.32mm
USD 37.50
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ID: 3865932 pcs
7.38ctw Topaz
9.97 x 7.94 x 5.11mm
USD 36.90
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ID: 3865442 pcs
6.66ctw Topaz
10.08 x 7.97 x 4.62mm
USD 33.30
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ID: 4184801 pcs
3.78ct Topaz
9.78 x 7.73 x 5.56mm
USD 26.46
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ID: 4051621 pcs
3.52ct Topaz
9.97 x 8.11 x 4.58mm
USD 24.46
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ID: 4359711 pcs
3.90ct Tourmaline
9.62 x 8.03 x 7.36mm
USD 702.00
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ID: 4184991 pcs
3.36ct Topaz
9.85 x 8.02 x 4.36mm
USD 23.52
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ID: 3868061 pcs
3.65ct Topaz
9.93 x 7.92 x 5.23mm
USD 18.25
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ID: 3865452 pcs
7.73ctw Topaz
10.00 x 7.94 x 5.48mm
USD 38.65
Item in Stock
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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