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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (192): Octagon Shape 8x6 mm Gems Clear All
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ID: 3671142 pcs
thumb image of 3.8ct Octagon Facet Swiss Blue Topaz (ID: 367114)
3.83ct Topaz
8.02 x 6.14 x 3.99mm
USD 24.40
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ID: 3659042 pcs
thumb image of 3.6ct Octagon Facet Swiss Blue Topaz (ID: 365904)
3.57ct Topaz
8.14 x 6.12 x 3.57mm
USD 21.96
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ID: 3815094 pcs
thumb image of 8ct Octagon Facet Swiss Blue Topaz (ID: 381509)
8.03ct Topaz
7.99 x 6.03 x 4.26mm
USD 56.21
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ID: 4472222 pcs
thumb image of 2.2ct Octagon Step Cut Yellow Golden Citrine (ID: 447222)
2.22ct Citrine
7.84 x 5.85 x 3.14mm
USD 11.10
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ID: 3723734 pcs
thumb image of 8ct Octagon Facet Swiss Blue Topaz (ID: 372373)
7.95ct Topaz
8.09 x 6.07 x 4.28mm
USD 55.65
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ID: 4287551 pcs
thumb image of 1.8ct Octagon Facet Rose Pink Tourmaline (ID: 428755)
1.76ct Tourmaline
8.15 x 6.10 x 4.41mm
USD 176.00
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ID: 3814951 pcs
thumb image of 1.7ct Octagon Facet Swiss Blue Topaz (ID: 381495)
1.70ct Topaz
8.01 x 5.79 x 3.65mm
USD 11.90
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ID: 4472151 pcs
thumb image of 1.7ct Octagon Step Cut Yellow Golden Citrine (ID: 447215)
1.70ct Citrine
7.75 x 6.06 x 4.62mm
USD 8.50
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ID: 3654682 pcs
thumb image of 3.9ct Octagon Facet Swiss Blue Topaz (ID: 365468)
3.86ct Topaz
8.09 x 6.10 x 3.94mm
USD 21.42
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ID: 3731644 pcs
thumb image of 7.6ct Octagon Facet Swiss Blue Topaz (ID: 373164)
7.58ct Topaz
7.93 x 5.97 x 4.04mm
USD 46.09
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ID: 3723794 pcs
thumb image of 8.7ct Octagon Facet Swiss Blue Topaz (ID: 372379)
8.72ct Topaz
8.11 x 6.09 x 4.47mm
USD 61.04
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ID: 4315281 pcs
thumb image of 2.5ct Octagon Facet Cinnamon Orange Hessonite Garnet (ID: 431528)
2.54ct Hessonite Garnet
7.89 x 6.00 x 5.10mm
USD 45.72
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ID: 3815084 pcs
thumb image of 6.9ct Octagon Facet Swiss Blue Topaz (ID: 381508)
6.94ct Topaz
7.97 x 6.02 x 3.69mm
USD 48.58
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ID: 4196741 pcs
thumb image of 1.9ct Octagon Facet Rose Tourmaline (ID: 419674)
1.89ct Tourmaline
8.17 x 6.05 x 4.19mm
USD 189.00
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ID: 3800811 pcs
thumb image of 1.6ct Octagon Facet Green Emerald (ID: 380081)
1.61ct Emerald
8.06 x 5.78 x 4.56mm
USD 1564.57
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ID: 3723244 pcs
thumb image of 8.5ct Octagon Facet Swiss Blue Topaz (ID: 372324)
8.49ct Topaz
8.12 x 6.09 x 4.18mm
USD 59.43
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ID: 3731544 pcs
thumb image of 7.5ct Octagon Facet Swiss Blue Topaz (ID: 373154)
7.54ct Topaz
7.97 x 6.01 x 3.82mm
USD 45.84
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ID: 3724254 pcs
thumb image of 7.5ct Octagon Facet Swiss Blue Topaz (ID: 372425)
7.53ct Topaz
8.06 x 6.07 x 3.83mm
USD 52.71
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ID: 4307201 pcs
thumb image of 2.4ct Octagon Facet Light Golden Zircon (ID: 430720)
2.38ct Zircon
8.24 x 5.99 x 3.57mm
USD 83.30
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ID: 3470712 pcs
thumb image of 3.5ct Octagon Facet Swiss Blue Topaz (ID: 347071)
3.49ct Topaz
8.07 x 6.03 x 3.65mm
USD 22.30
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ID: 4472691 pcs
thumb image of 0.9ct Octagon Step Cut Yellow Golden Citrine (ID: 447269)
0.92ct Citrine
7.74 x 6.03 x 2.98mm
USD 4.60
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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