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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (186): Octagon Shape 7x5 mm Gems Clear All
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ID: 37168410 pcs
thumb image of 10.9ct Octagon Facet Deep Red Almandine Garnet (ID: 371684)
10.85 ct Almandine Garnet
7 x 5 mm
$ 54.25
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ID: 4481692 pcs
thumb image of 2.3ct Octagon Step Cut Swiss Blue Topaz (ID: 448169)
2.33 ct Topaz
7.1 x 5.1 mm
$ 15.21
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ID: 4481002 pcs
thumb image of 2.2ct Octagon Step Cut Swiss Blue Topaz (ID: 448100)
2.20 ct Topaz
7.1 x 5 mm
$ 14.37
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ID: 4481622 pcs
thumb image of 2.6ct Octagon Step Cut Swiss Blue Topaz (ID: 448162)
2.58 ct Topaz
7.1 x 5 mm
$ 16.85
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ID: 4053234 pcs
thumb image of 4.7ct Octagon Facet Swiss Blue Topaz (ID: 405323)
4.71 ct Topaz
7.1 x 5.1 mm
$ 32.73
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ID: 3941022 pcs
thumb image of 1.9ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 394102)
1.93 ct Hessonite Garnet
6.9 x 5 mm
$ 26.92
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ID: 3786031 pcs
thumb image of 1ct Octagon Facet Yellowish Green Tourmaline (ID: 378603)
0.99 ct Tourmaline
7 x 5.1 mm
$ 45.04
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ID: 4480262 pcs
thumb image of 2.1ct Octagon Step Cut Swiss Blue Topaz (ID: 448026)
2.05 ct Topaz
7 x 4.9 mm
$ 13.39
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ID: 4480182 pcs
thumb image of 2ct Octagon Step Cut Swiss Blue Topaz (ID: 448018)
2.02 ct Topaz
7 x 4.9 mm
$ 13.19
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ID: 4051134 pcs
thumb image of 4.7ct Octagon Facet Swiss Blue Topaz (ID: 405113)
4.66 ct Topaz
7.1 x 5.1 mm
$ 32.39
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ID: 3789081 pcs
thumb image of 1ct Octagon Facet Yellowish Green Tourmaline (ID: 378908)
1.01 ct Tourmaline
7.2 x 5.1 mm
$ 45.96
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ID: 4480902 pcs
thumb image of 2.4ct Octagon Step Cut Swiss Blue Topaz (ID: 448090)
2.35 ct Topaz
7 x 5 mm
$ 15.35
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ID: 2756895 pcs
thumb image of 4.8ct Octagon Step Cut Yellow Golden Citrine (ID: 275689)
4.82 ct Citrine
6.8 x 5 mm
$ 25.31
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ID: 4483884 pcs
thumb image of 4.1ct Octagon Step Cut Swiss Blue Topaz (ID: 448388)
4.10 ct Topaz
6.9 x 4.9 mm
$ 26.77
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ID: 2751615 pcs
thumb image of 5.6ct Octagon Step Cut Yellow Golden Citrine (ID: 275161)
5.58 ct Citrine
7.1 x 5 mm
$ 29.30
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ID: 3716786 pcs
thumb image of 7.8ct Octagon Facet Deep Red Almandine Garnet (ID: 371678)
7.77 ct Almandine Garnet
7.1 x 5 mm
$ 38.85
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ID: 4482352 pcs
thumb image of 2.3ct Octagon Step Cut Swiss Blue Topaz (ID: 448235)
2.31 ct Topaz
7.1 x 5.1 mm
$ 15.08
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ID: 37153510 pcs
thumb image of 10.2ct Octagon Facet Red Almandine Garnet (ID: 371535)
10.17 ct Almandine Garnet
7 x 4.9 mm
$ 50.85
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ID: 4483824 pcs
thumb image of 4.2ct Octagon Step Cut Swiss Blue Topaz (ID: 448382)
4.18 ct Topaz
7.1 x 5.1 mm
$ 27.30
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ID: 4480922 pcs
thumb image of 2.3ct Octagon Step Cut Swiss Blue Topaz (ID: 448092)
2.28 ct Topaz
7.1 x 5 mm
$ 14.89
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ID: 4051154 pcs
thumb image of 4.3ct Octagon Facet Swiss Blue Topaz (ID: 405115)
4.26 ct Topaz
7.1 x 5 mm
$ 29.61
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Octagon Shape 7x5 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 7 x 5 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