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: Octagon Shape 12x10 mm Gems
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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (47): Octagon Shape 12x10 mm Gems Clear All
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ID: 4606231 pcs
thumb image of 6.1ct Octagon Step Cut Yellow Golden Citrine (ID: 460623)
6.14 ct Citrine
12.1 x 10 mm
$ 42.98
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ID: 4655081 pcs
thumb image of 5.3ct Octagon Step Cut Yellow Golden Citrine (ID: 465508)
5.28 ct Citrine
12.1 x 10.1 mm
$ 32.31
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ID: 4655181 pcs
thumb image of 4.7ct Octagon Step Cut Yellow Golden Citrine (ID: 465518)
4.66 ct Citrine
12.1 x 10.2 mm
$ 28.52
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ID: 4607121 pcs
thumb image of 6ct Octagon Step Cut Yellow Golden Citrine (ID: 460712)
6.01 ct Citrine
12 x 9.9 mm
$ 42.07
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ID: 4607151 pcs
thumb image of 5.4ct Octagon Step Cut Yellow Golden Citrine (ID: 460715)
5.42 ct Citrine
11.9 x 9.9 mm
$ 37.94
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ID: 4607161 pcs
thumb image of 7.4ct Octagon Step Cut Yellow Golden Citrine (ID: 460716)
7.44 ct Citrine
11.9 x 10.1 mm
$ 52.08
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ID: 4613121 pcs
thumb image of 5ct Octagon Step Cut Yellow Golden Citrine (ID: 461312)
4.96 ct Citrine
12.1 x 10 mm
$ 34.72
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ID: 4655171 pcs
thumb image of 4.6ct Octagon Step Cut Yellow Golden Citrine (ID: 465517)
4.56 ct Citrine
11.9 x 10 mm
$ 27.91
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ID: 4655131 pcs
thumb image of 4.8ct Octagon Step Cut Yellow Golden Citrine (ID: 465513)
4.75 ct Citrine
12.2 x 10.1 mm
$ 29.07
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ID: 4606261 pcs
thumb image of 5.1ct Octagon Step Cut Yellow Golden Citrine (ID: 460626)
5.10 ct Citrine
12.1 x 9.9 mm
$ 35.70
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ID: 4606241 pcs
thumb image of 6ct Octagon Step Cut Yellow Golden Citrine (ID: 460624)
6.00 ct Citrine
12 x 9.9 mm
$ 42.00
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ID: 4607721 pcs
thumb image of 6.5ct Octagon Step Cut Yellow Golden Citrine (ID: 460772)
6.53 ct Citrine
12.1 x 10.1 mm
$ 45.71
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ID: 4607221 pcs
thumb image of 6ct Octagon Step Cut Yellow Golden Citrine (ID: 460722)
5.98 ct Citrine
11.9 x 9.8 mm
$ 41.86
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ID: 4607771 pcs
thumb image of 6.1ct Octagon Step Cut Yellow Golden Citrine (ID: 460777)
6.13 ct Citrine
12.1 x 10.1 mm
$ 42.91
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ID: 4607831 pcs
thumb image of 5.2ct Octagon Step Cut Yellow Golden Citrine (ID: 460783)
5.18 ct Citrine
12.1 x 9.9 mm
$ 36.26
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ID: 4686821 pcs
thumb image of 6ct Octagon Step Cut Green Agate (ID: 468682)
6.04 ct Agate
12.2 x 10.1 mm
$ 12.08
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ID: 4686861 pcs
thumb image of 4.6ct Octagon Step Cut Green Agate (ID: 468686)
4.56 ct Agate
12 x 10.1 mm
$ 9.12
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ID: 4656841 pcs
thumb image of 4.2ct Octagon Step Cut Yellow Golden Citrine (ID: 465684)
4.23 ct Citrine
12 x 9.9 mm
$ 25.89
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ID: 4607131 pcs
thumb image of 7.4ct Octagon Step Cut Yellow Golden Citrine (ID: 460713)
7.35 ct Citrine
12 x 10 mm
$ 51.45
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ID: 4655091 pcs
thumb image of 5.1ct Octagon Step Cut Yellow Golden Citrine (ID: 465509)
5.08 ct Citrine
12 x 10 mm
$ 31.40
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ID: 4686911 pcs
thumb image of 5.1ct Octagon Step Cut Green Agate (ID: 468691)
5.12 ct Agate
12 x 10.2 mm
$ 10.24
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Octagon Shape 12x10 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 12 x 10 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