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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (91): Octagon Shape 12x10 mm Gems Clear All
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Green Agate Gem - 6ct Octagon Step Cut (ID: 468682)

Octagon / Emerald Cut Green Agate

6ct
12.2 x 10.1 mm
$ 12.08
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Golden Green Apatite Gem - 5.3ct Octagon Facet (ID: 407841)

Octagon / Emerald Cut Green Apatite

5.3ct
11.6 x 10.4 mm
$ 221.88
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Yellow Golden Citrine Gem - 5ct Octagon Step Cut (ID: 460723)

Octagon / Emerald Cut Yellow Citrine

5ct
11.9 x 9.9 mm
$ 34.93
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Yellow Golden Citrine Gem - 7.1ct Octagon Step Cut (ID: 460618)

Octagon / Emerald Cut Yellow Citrine

7.1ct
12 x 9.9 mm
$ 49.91
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Green Agate Gem - 5.8ct Octagon Step Cut (ID: 468689)

Octagon / Emerald Cut Green Agate

5.8ct
12.1 x 10 mm
$ 11.66
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Yellow Golden Citrine Gem - 5ct Octagon Step Cut (ID: 460721)

Octagon / Emerald Cut Yellow Citrine

5ct
11.9 x 9.9 mm
$ 34.65
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Yellow Golden Citrine Gem - 4.2ct Octagon Step Cut (ID: 465684)

Octagon / Emerald Cut Yellow Citrine

4.2ct
12 x 9.9 mm
$ 25.89
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Green Agate Gem - 5.3ct Octagon Step Cut (ID: 478260)

Octagon / Emerald Cut Green Agate

5.3ct
12.2 x 10 mm
$ 10.64
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Green Agate Gem - 5.4ct Octagon Step Cut (ID: 477913)

Octagon / Emerald Cut Green Agate

5.4ct
12.2 x 10.2 mm
$ 10.72
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Green Agate Gem - 5.8ct Octagon Step Cut (ID: 478341)

Octagon / Emerald Cut Green Agate

5.8ct
12.2 x 10.1 mm
$ 11.54
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Green Agate Gem - 4.9ct Octagon Step Cut (ID: 478196)

Octagon / Emerald Cut Green Agate

4.9ct
12.1 x 10 mm
$ 9.80
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Green Agate Gem - 5.1ct Octagon Step Cut (ID: 468739)

Octagon / Emerald Cut Green Agate

5.1ct
12.2 x 10 mm
$ 10.12
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Green Agate Gem - 5.8ct Octagon Step Cut (ID: 478203)

Octagon / Emerald Cut Green Agate

5.8ct
12.1 x 10.2 mm
$ 11.60
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Green Agate Gem - 5.9ct Octagon Step Cut (ID: 478258)

Octagon / Emerald Cut Green Agate

5.9ct
12.2 x 10.1 mm
$ 11.72
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Green Agate Gem - 6.2ct Octagon Step Cut (ID: 478340)

Octagon / Emerald Cut Green Agate

6.2ct
12.1 x 10.2 mm
$ 12.46
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Green Agate Gem - 5.7ct Octagon Step Cut (ID: 478072)

Octagon / Emerald Cut Green Agate

5.7ct
12.1 x 10 mm
$ 11.44
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Green Agate Gem - 5.1ct Octagon Step Cut (ID: 468691)

Octagon / Emerald Cut Green Agate

5.1ct
12 x 10.2 mm
$ 10.24
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Green Agate Gem - 5.5ct Octagon Step Cut (ID: 478259)

Octagon / Emerald Cut Green Agate

5.5ct
12 x 10.1 mm
$ 11.08
Item in Stock
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Yellow Golden Citrine Gem - 6ct Octagon Step Cut (ID: 460778)

Octagon / Emerald Cut Yellow Citrine

6ct
12.1 x 10.2 mm
$ 41.79
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Yellow Golden Citrine Gem - 5.2ct Octagon Step Cut (ID: 461313)

Octagon / Emerald Cut Yellow Citrine

5.2ct
11.7 x 9.6 mm
$ 36.61
Item in Stock
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Yellow Golden Citrine Gem - 6ct Octagon Step Cut (ID: 460621)

Octagon / Emerald Cut Yellow Citrine

6ct
12 x 10.1 mm
$ 42.28
Item in Stock
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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.

Certified Customer Reviews
Overall Rating -> 9 star ratings
Great selection. Love the many learning features like articles and gem information. Prices competitive for natural stones. I do miss not having a selection of lab-made stones, CZ’s, etc, which are useful when price and cost are factors.
Posted By Dirk in January, 2019
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Overall Rating -> 10 star ratings
Website easy to navigate.
Posted By RaeRae in January, 2019
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Overall Rating -> 9 star ratings
I WOULD RECOMMEND GEM SELECT.
Posted By BO in January, 2019
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Overall Rating -> 10 star ratings
As Always never disappointed in any gemstone I purchase from this site. I have never had a problem. Thank-You Gemselect for offering such a comprehensive variety . I will continue to order from this site.
Posted By Brian in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Easy to find what i'm looking for on website, very clear, like photos
Posted By Lifter in January, 2019
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Overall Rating -> 10 star ratings
Better than what I expected. Beautifully cut gem!
Posted By in January, 2019
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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