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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (138): Octagon Shape 8x6 mm Gems Clear All
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ID: 3723544 pcs
thumb image of 8.3ct Octagon Facet Swiss Blue Topaz (ID: 372354)
8.25 ct Topaz
8.1 x 6.2 mm
$ 57.75
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ID: 3948642 pcs
thumb image of 3.1ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 394864)
3.13 ct Hessonite Garnet
8.1 x 6.2 mm
$ 43.29
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ID: 3731624 pcs
thumb image of 8.2ct Octagon Facet Swiss Blue Topaz (ID: 373162)
8.19 ct Topaz
8.1 x 6 mm
$ 49.80
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ID: 3941812 pcs
thumb image of 3.4ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 394181)
3.37 ct Hessonite Garnet
8 x 6.1 mm
$ 47.01
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ID: 3722784 pcs
thumb image of 8.2ct Octagon Facet Swiss Blue Topaz (ID: 372278)
8.24 ct Topaz
8.1 x 6 mm
$ 57.68
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ID: 3238265 pcs
thumb image of 7.8ct Octagon Facet Yellow Golden Citrine (ID: 323826)
7.81 ct Citrine
8.1 x 6.1 mm
$ 45.11
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ID: 3988364 pcs
thumb image of 6ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 398836)
6.03 ct Hessonite Garnet
8 x 6.1 mm
$ 120.60
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ID: 3723294 pcs
thumb image of 7.2ct Octagon Facet Swiss Blue Topaz (ID: 372329)
7.23 ct Topaz
8.1 x 6 mm
$ 50.61
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ID: 4466941 pcs
thumb image of 1.5ct Octagon Step Cut Yellow Golden Citrine (ID: 446694)
1.52 ct Citrine
8 x 6 mm
$ 7.60
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ID: 3941732 pcs
thumb image of 3.3ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 394173)
3.26 ct Hessonite Garnet
7.9 x 6 mm
$ 45.48
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ID: 3723264 pcs
thumb image of 7.8ct Octagon Facet Swiss Blue Topaz (ID: 372326)
7.79 ct Topaz
8 x 6 mm
$ 54.53
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ID: 3674084 pcs
thumb image of 7.4ct Octagon Facet Swiss Blue Topaz (ID: 367408)
7.43 ct Topaz
8.1 x 6.1 mm
$ 47.33
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ID: 3722994 pcs
thumb image of 7.8ct Octagon Facet Swiss Blue Topaz (ID: 372299)
7.78 ct Topaz
8.2 x 6.2 mm
$ 54.46
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ID: 4472071 pcs
thumb image of 1.9ct Octagon Step Cut Yellow Golden Citrine (ID: 447207)
1.88 ct Citrine
8 x 6.2 mm
$ 9.40
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ID: 3723774 pcs
thumb image of 7.8ct Octagon Facet Swiss Blue Topaz (ID: 372377)
7.76 ct Topaz
8 x 6 mm
$ 54.32
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ID: 3815084 pcs
thumb image of 6.9ct Octagon Facet Swiss Blue Topaz (ID: 381508)
6.94 ct Topaz
8 x 6 mm
$ 48.58
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ID: 3723284 pcs
thumb image of 7.8ct Octagon Facet Swiss Blue Topaz (ID: 372328)
7.75 ct Topaz
8.2 x 6.1 mm
$ 54.25
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ID: 3723504 pcs
thumb image of 8.6ct Octagon Facet Swiss Blue Topaz (ID: 372350)
8.59 ct Topaz
8.1 x 6.1 mm
$ 60.13
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ID: 3722984 pcs
thumb image of 7.3ct Octagon Facet Swiss Blue Topaz (ID: 372298)
7.27 ct Topaz
8 x 6 mm
$ 50.89
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ID: 3654682 pcs
thumb image of 3.9ct Octagon Facet Swiss Blue Topaz (ID: 365468)
3.86 ct Topaz
8.1 x 6.1 mm
$ 21.42
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ID: 3722704 pcs
thumb image of 7.1ct Octagon Facet Swiss Blue Topaz (ID: 372270)
7.06 ct Topaz
8 x 6.1 mm
$ 49.42
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Octagon Shape 8x6 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 8 x 6 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