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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (90): Marquise Shape 12x6 mm Gems Clear All
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ID: 4331731 pcs
2.56ct Topaz
12.05mm x 6.06mm x 4.74mm
USD 12.80
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ID: 4324982 pcs
4.78ctw Topaz
12.17mm x 6.10mm x 4.40mm
USD 23.90
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ID: 4324962 pcs
4.63ctw Topaz
11.90mm x 5.94mm x 4.52mm
USD 23.15
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ID: 4328982 pcs
4.51ctw Topaz
12.14mm x 6.11mm x 4.58mm
USD 22.55
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ID: 4327482 pcs
3.56ctw Topaz
12.21mm x 6.19mm x 3.84mm
USD 17.80
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ID: 4327562 pcs
4.99ctw Topaz
12.12mm x 6.14mm x 4.73mm
USD 24.95
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ID: 4330361 pcs
2.55ct Topaz
12.05mm x 6.14mm x 4.87mm
USD 12.75
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ID: 4167502 pcs
3.87ctw Smoky Quartz
12.06mm x 6.11mm x 4.73mm
USD 5.80
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ID: 4327542 pcs
3.76ctw Topaz
11.89mm x 6.20mm x 4.09mm
USD 18.80
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ID: 4331741 pcs
1.81ct Topaz
11.75mm x 5.90mm x 3.50mm
USD 9.05
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ID: 4330461 pcs
2.40ct Topaz
12.02mm x 6.02mm x 4.50mm
USD 12.00
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ID: 4326652 pcs
4.78ctw Topaz
12.03mm x 6.01mm x 4.57mm
USD 23.90
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ID: 4022621 pcs
2.14ct Ruby
12.26mm x 5.84mm x 3.42mm
USD 2568.00
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ID: 4329731 pcs
2.81ct Topaz
12.11mm x 6.19mm x 5.09mm
USD 14.05
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ID: 4331711 pcs
2.47ct Topaz
12.26mm x 6.21mm x 4.62mm
USD 12.35
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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: 4326722 pcs
4.86ctw Topaz
12.02mm x 6.06mm x 4.50mm
USD 24.30
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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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ID: 4330401 pcs
2.35ct Topaz
12.11mm x 6.19mm x 4.02mm
USD 11.75
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ID: 4328972 pcs
4.93ctw Topaz
11.83mm x 6.02mm x 4.93mm
USD 24.65
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ID: 4058732 pcs
4.24ctw Topaz
11.91mm x 6.00mm x 4.25mm
USD 29.55
Item in Stock
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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