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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (102): Octagon Shape 5x3 mm Gems Clear All
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ID: 4125208 pcs
2.90ctw Sapphire
4.97mm x 3.03mm x 2.17mm
USD 116.00
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ID: 3750275 pcs
2.20ctw Sapphire
5.03mm x 3.06mm x 2.47mm
USD 93.39
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ID: 4125715 pcs
1.65ctw Sapphire
5.02mm x 3.08mm x 2.04mm
USD 66.00
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ID: 3111936 pcs
2.07ctw Sapphire
5.09mm x 3.11mm x 1.99mm
USD 72.45
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ID: 34997220 pcs
6.29ctw Sapphire
4.97mm x 2.95mm x 1.95mm
USD 220.15
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ID: 3350826 pcs
1.95ctw Sapphire
5.05mm x 3.06mm x 1.98mm
USD 68.25
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ID: 3747146 pcs
2.33ctw Sapphire
5.03mm x 3.08mm x 2.23mm
USD 98.91
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ID: 3750215 pcs
1.84ctw Sapphire
4.94mm x 3.08mm x 2.34mm
USD 78.11
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ID: 4125177 pcs
2.70ctw Sapphire
5.07mm x 3.12mm x 2.63mm
USD 108.00
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ID: 3349386 pcs
1.75ctw Sapphire
4.80mm x 2.98mm x 1.94mm
USD 61.25
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ID: 4125218 pcs
2.95ctw Sapphire
5.10mm x 3.08mm x 2.13mm
USD 118.00
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ID: 4122548 pcs
2.05ctw Iolite
4.97mm x 3.06mm x 2.31mm
USD 41.00
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ID: 39980515 pcs
4.55ctw Topaz
4.85mm x 3.05mm x 2.26mm
USD 31.85
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ID: 3350316 pcs
1.84ctw Sapphire
4.91mm x 2.93mm x 1.94mm
USD 64.40
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ID: 34996820 pcs
6.09ctw Sapphire
4.98mm x 3.02mm x 2.23mm
USD 213.15
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ID: 36043120 pcs
6.80ctw Sapphire
5.01mm x 3.11mm x 2.14mm
USD 238.00
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ID: 4333974 pcs
0.83ctw Aquamarine
4.83mm x 3.03mm x 1.92mm
USD 24.90
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ID: 3747156 pcs
2.16ctw Sapphire
5.02mm x 3.02mm x 2.33mm
USD 91.69
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ID: 3350816 pcs
1.78ctw Sapphire
5.04mm x 3.04mm x 1.76mm
USD 62.30
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ID: 3349356 pcs
1.98ctw Sapphire
4.92mm x 3.01mm x 2.13mm
USD 69.30
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ID: 4122568 pcs
2.17ctw Iolite
5.10mm x 3.04mm x 2.32mm
USD 43.40
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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