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: Octagon Shape 5x3 mm Gems
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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (116): Octagon Shape 5x3 mm Gems Clear All
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ID: 4505816 pcs
thumb image of 2.1ct Octagon Step Cut Multicolor Sapphire (ID: 450581)
2.11 ct Sapphire
5 x 3 mm
$ 84.40
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ID: 4505196 pcs
thumb image of 2.3ct Octagon Step Cut Multicolor Sapphire (ID: 450519)
2.33 ct Sapphire
5 x 3 mm
$ 93.20
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ID: 2551315 pcs
thumb image of 1.4ct Octagon Step Cut Violet Iolite (ID: 255131)
1.39 ct Iolite
5 x 3.1 mm
$ 14.60
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ID: 4122568 pcs
thumb image of 2.2ct Octagon Facet Violet Blue Iolite (ID: 412256)
2.17 ct Iolite
5.1 x 3 mm
$ 43.40
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ID: 2551225 pcs
thumb image of 1.3ct Octagon Step Cut Violet Iolite (ID: 255122)
1.34 ct Iolite
5 x 3.1 mm
$ 14.07
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ID: 41242810 pcs
thumb image of 2.2ct Octagon Facet Violet Blue Iolite (ID: 412428)
2.21 ct Iolite
5 x 3 mm
$ 44.20
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ID: 4122548 pcs
thumb image of 2.1ct Octagon Facet Violet Blue Iolite (ID: 412254)
2.05 ct Iolite
5 x 3.1 mm
$ 41.00
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ID: 3350286 pcs
thumb image of 2.1ct Octagon / Scissor Cut Multicolor Sapphire (ID: 335028)
2.07 ct Sapphire
5 x 3 mm
$ 72.45
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ID: 3349436 pcs
thumb image of 2ct Octagon / Scissor Cut Yellow Golden Sapphire (ID: 334943)
1.96 ct Sapphire
4.9 x 2.9 mm
$ 68.60
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ID: 3349366 pcs
thumb image of 2.2ct Octagon / Scissor Cut Pinkish Purple Sapphire (ID: 334936)
2.16 ct Sapphire
5 x 3 mm
$ 75.60
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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: 3750314 pcs
thumb image of 1.6ct Octagon / Scissor Cut Green Sapphire (ID: 375031)
1.59 ct Sapphire
5 x 3 mm
$ 67.50
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ID: 4637595 pcs
thumb image of 1.9ct Octagon Step Cut Multicolor Sapphire (ID: 463759)
1.92 ct Sapphire
4.9 x 3.1 mm
$ 76.80
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ID: 3350276 pcs
thumb image of 1.9ct Octagon / Scissor Cut Yellow Golden Sapphire (ID: 335027)
1.94 ct Sapphire
5 x 3 mm
$ 67.90
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ID: 4636255 pcs
thumb image of 1.8ct Octagon Step Cut Multicolor Sapphire (ID: 463625)
1.83 ct Sapphire
5 x 3 mm
$ 73.20
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ID: 4505146 pcs
thumb image of 2.1ct Octagon Step Cut Purple Pink Sapphire (ID: 450514)
2.06 ct Sapphire
5.1 x 3.1 mm
$ 82.40
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ID: 4504426 pcs
thumb image of 2ct Octagon Step Cut Purple Pink Sapphire (ID: 450442)
2.03 ct Sapphire
5.1 x 3 mm
$ 81.20
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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: 4506486 pcs
thumb image of 2.3ct Octagon Step Cut Multicolor Sapphire (ID: 450648)
2.34 ct Sapphire
5.1 x 3 mm
$ 93.60
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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: 3350336 pcs
thumb image of 1.8ct Octagon / Scissor Cut Multicolor Sapphire (ID: 335033)
1.76 ct Sapphire
5 x 3 mm
$ 61.60
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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