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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (117): Octagon Shape 5x3 mm Gems Clear All
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ID: 4504496 pcs
thumb image of 2.2ct Octagon Step Cut Purple Pink Sapphire (ID: 450449)
2.20 ct Sapphire
5 x 3.1 mm
$ 88.00
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ID: 4505746 pcs
thumb image of 2.2ct Octagon Step Cut Multicolor Sapphire (ID: 450574)
2.23 ct Sapphire
5 x 3 mm
$ 89.20
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ID: 3350356 pcs
thumb image of 1.9ct Octagon / Scissor Cut Yellow Golden Sapphire (ID: 335035)
1.89 ct Sapphire
5 x 3 mm
$ 66.15
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ID: 39979215 pcs
thumb image of 5.1ct Octagon Facet Swiss Blue Topaz (ID: 399792)
5.06 ct Topaz
5.1 x 3.1 mm
$ 35.42
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ID: 4525276 pcs
thumb image of 2.1ct Octagon Step Cut Multicolor Sapphire (ID: 452527)
2.14 ct Sapphire
4.9 x 3.1 mm
$ 85.60
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ID: 4522656 pcs
thumb image of 2.2ct Octagon Step Cut Pink Sapphire (ID: 452265)
2.24 ct Sapphire
4.9 x 3 mm
$ 89.60
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ID: 3750304 pcs
thumb image of 1.7ct Octagon / Scissor Cut Green Sapphire (ID: 375030)
1.69 ct Sapphire
5 x 3 mm
$ 71.74
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ID: 4505826 pcs
thumb image of 1.9ct Octagon Step Cut Multicolor Sapphire (ID: 450582)
1.93 ct Sapphire
5.1 x 3 mm
$ 77.20
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ID: 45251510 pcs
thumb image of 3.8ct Octagon Step Cut Yellow Sapphire (ID: 452515)
3.78 ct Sapphire
5 x 3.1 mm
$ 151.20
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ID: 3350326 pcs
thumb image of 2ct Octagon / Scissor Cut Yellow Golden Sapphire (ID: 335032)
1.96 ct Sapphire
4.9 x 3 mm
$ 68.60
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ID: 4125756 pcs
thumb image of 2ct Octagon Step Cut Multicolor Sapphire (ID: 412575)
1.95 ct Sapphire
5 x 2.9 mm
$ 78.00
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ID: 3747534 pcs
thumb image of 1.4ct Octagon / Scissor Cut Multicolor Sapphire (ID: 374753)
1.36 ct Sapphire
5.1 x 3 mm
$ 57.73
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ID: 4506454 pcs
thumb image of 1.6ct Octagon Step Cut Multicolor Sapphire (ID: 450645)
1.59 ct Sapphire
5 x 3 mm
$ 63.60
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ID: 4524126 pcs
thumb image of 1.9ct Octagon Step Cut Multicolor Sapphire (ID: 452412)
1.87 ct Sapphire
5 x 3 mm
$ 74.80
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ID: 4125198 pcs
thumb image of 3ct Octagon / Scissor Cut Yellow Golden Sapphire (ID: 412519)
3.04 ct Sapphire
5.1 x 3.1 mm
$ 121.60
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ID: 4505226 pcs
thumb image of 2.2ct Octagon Step Cut Purple Pink Sapphire (ID: 450522)
2.18 ct Sapphire
5.1 x 3.1 mm
$ 87.20
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ID: 34996820 pcs
thumb image of 6.1ct Octagon / Scissor Cut Multicolor Sapphire (ID: 349968)
6.09 ct Sapphire
5 x 3 mm
$ 213.15
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ID: 4506526 pcs
thumb image of 2.5ct Octagon Step Cut Multicolor Sapphire (ID: 450652)
2.45 ct Sapphire
5.1 x 3 mm
$ 98.00
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ID: 3349316 pcs
thumb image of 1.8ct Octagon / Scissor Cut Multicolor Sapphire (ID: 334931)
1.76 ct Sapphire
4.9 x 3 mm
$ 61.60
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ID: 45235810 pcs
thumb image of 3.5ct Octagon Step Cut Purple Sapphire (ID: 452358)
3.45 ct Sapphire
4.9 x 3.1 mm
$ 138.00
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ID: 3349356 pcs
thumb image of 2ct Octagon / Scissor Cut Multicolor Sapphire (ID: 334935)
1.98 ct Sapphire
5 x 3 mm
$ 69.30
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Octagon Shape 5x3 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 5 x 3 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