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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (100): Marquise Shape 12x6 mm Gems Clear All
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ID: 4366771 pcs
1.96ct Rutile Quartz
12.03mm x 6.17mm x 3.59mm
USD 4.82
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ID: 4329742 pcs
4.24ctw Topaz
12.02mm x 6.10mm x 3.97mm
USD 21.20
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ID: 4331671 pcs
2.46ct Topaz
12.25mm x 6.14mm x 4.45mm
USD 12.30
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ID: 4167512 pcs
3.61ctw Smoky Quartz
11.93mm x 6.01mm x 4.49mm
USD 5.42
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ID: 4326712 pcs
4.45ctw Topaz
12.09mm x 6.11mm x 4.00mm
USD 22.25
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ID: 4325012 pcs
4.37ctw Topaz
12.22mm x 6.24mm x 4.42mm
USD 21.85
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ID: 4248571 pcs
2.00ct Tanzanite
11.65mm x 5.81mm x 4.44mm
USD 360.00
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ID: 4325052 pcs
4.36ctw Topaz
11.89mm x 6.04mm x 4.33mm
USD 21.80
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ID: 4167462 pcs
3.57ctw Smoky Quartz
11.91mm x 6.07mm x 4.30mm
USD 5.36
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ID: 3428914 pcs
10.96ctw Malachite
12.48mm x 6.23mm x 3.45mm
USD 14.25
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ID: 4329012 pcs
4.75ctw Topaz
12.08mm x 6.02mm x 4.46mm
USD 23.75
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ID: 4324992 pcs
4.15ctw Topaz
12.07mm x 6.23mm x 4.11mm
USD 20.75
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ID: 4331751 pcs
2.09ct Topaz
11.96mm x 6.17mm x 4.15mm
USD 10.45
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ID: 4366761 pcs
2.64ct Rutile Quartz
11.96mm x 6.11mm x 4.77mm
USD 6.49
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ID: 4331721 pcs
2.34ct Topaz
12.02mm x 6.13mm x 4.35mm
USD 11.70
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ID: 4329661 pcs
2.89ct Topaz
12.09mm x 6.22mm x 4.97mm
USD 14.45
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ID: 4328932 pcs
4.46ctw Topaz
11.89mm x 6.08mm x 4.34mm
USD 22.30
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ID: 4167442 pcs
3.76ctw Smoky Quartz
12.07mm x 6.07mm x 4.67mm
USD 5.64
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ID: 4331681 pcs
2.28ct Topaz
12.22mm x 6.16mm x 4.40mm
USD 11.40
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ID: 4366731 pcs
2.06ct Rutile Quartz
12.11mm x 6.23mm x 3.90mm
USD 5.07
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ID: 4329721 pcs
2.00ct Topaz
12.04mm x 5.94mm x 3.88mm
USD 10.00
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Marquise Shape 12x6 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 marquise shaped facet cut gems, gemstone carvings and cabochons available in 12 mm x 6 mm sizes. For the largest selection of colored gemstones, Shop GemSelect Online.

As a general guideline, when it comes to calibrated gems, they are not usually expected to be cut to exact measurements and specifications. But rather, they're cut with slight variance in size, though the close approximatation in size is not clearly defined, there are general guidelines for what is considered acceptable. Obviously larger and heavy carat weight stones allow more room in size for variance, while smaller stones may leave little to none. This means a large 30mm calibrated gemstone, could actually be closer to 31 millimeters. For this reason, we recommend to always view the exact size in addition to the calibrated size details. The exact size will inform you of the variance you can expect. Some setting styles are more flexible with variance, such as prong settings, while other styles of mountings may need almost an exact size to the fraction of millimeter.

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