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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (187): Octagon Shape 7x5 mm Gems Clear All
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ID: 3988394 pcs
thumb image of 5.6ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 398839)
5.56 ct Hessonite Garnet
6.9 x 5 mm
$ 111.20
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ID: 4053244 pcs
thumb image of 4.7ct Octagon Facet Swiss Blue Topaz (ID: 405324)
4.71 ct Topaz
7.1 x 5.1 mm
$ 32.73
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ID: 3938512 pcs
thumb image of 2.6ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 393851)
2.57 ct Hessonite Garnet
6.9 x 5.1 mm
$ 35.98
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ID: 4052894 pcs
thumb image of 4.3ct Octagon Facet Swiss Blue Topaz (ID: 405289)
4.26 ct Topaz
7.1 x 5.1 mm
$ 29.61
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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: 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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ID: 4297252 pcs
thumb image of 3ct Octagon Facet Orange Zircon (ID: 429725)
2.98 ct Zircon
7.2 x 5.1 mm
$ 44.70
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ID: 4051224 pcs
thumb image of 4.7ct Octagon Facet Swiss Blue Topaz (ID: 405122)
4.71 ct Topaz
7.1 x 5.1 mm
$ 32.73
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ID: 4482882 pcs
thumb image of 2.4ct Octagon Step Cut Swiss Blue Topaz (ID: 448288)
2.44 ct Topaz
7.1 x 5.1 mm
$ 15.93
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ID: 4482372 pcs
thumb image of 2ct Octagon Step Cut Swiss Blue Topaz (ID: 448237)
2.04 ct Topaz
7 x 4.9 mm
$ 13.32
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ID: 4483854 pcs
thumb image of 4.3ct Octagon Step Cut Swiss Blue Topaz (ID: 448385)
4.33 ct Topaz
6.9 x 5 mm
$ 28.27
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ID: 4304941 pcs
thumb image of 1.5ct Octagon Facet Orange Zircon (ID: 430494)
1.46 ct Zircon
7.1 x 4.9 mm
$ 36.50
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ID: 4480272 pcs
thumb image of 2.2ct Octagon Step Cut Swiss Blue Topaz (ID: 448027)
2.16 ct Topaz
7 x 4.9 mm
$ 14.10
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ID: 2883724 pcs
thumb image of 5.1ct Octagon Facet Blue Kyanite (ID: 288372)
5.13 ct Kyanite
7.1 x 5 mm
$ 121.84
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ID: 3963381 pcs
thumb image of 0.9ct Octagon Facet Green/Pink Color-Change Diaspore (ID: 396338)
0.86 ct Color-Change Diaspore
7 x 4.9 mm
$ 41.07
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ID: 4482472 pcs
thumb image of 2.5ct Octagon Step Cut Swiss Blue Topaz (ID: 448247)
2.46 ct Topaz
7.1 x 5 mm
$ 16.06
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ID: 4304991 pcs
thumb image of 1.7ct Octagon Facet Orange Zircon (ID: 430499)
1.65 ct Zircon
7.1 x 5.1 mm
$ 41.25
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ID: 4483904 pcs
thumb image of 4.8ct Octagon Step Cut Swiss Blue Topaz (ID: 448390)
4.76 ct Topaz
7.2 x 5.1 mm
$ 31.08
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ID: 4482942 pcs
thumb image of 2.2ct Octagon Step Cut Swiss Blue Topaz (ID: 448294)
2.18 ct Topaz
7.1 x 5.1 mm
$ 14.24
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ID: 4482422 pcs
thumb image of 2.2ct Octagon Step Cut Swiss Blue Topaz (ID: 448242)
2.21 ct Topaz
7 x 4.9 mm
$ 14.43
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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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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