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You Selected (98): Marquise Shape 12x6 mm Gems Clear All
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ID: 4328922 pcs
thumb image of 5.1ct Marquise Facet Swiss Blue Topaz (ID: 432892)
5.08ct Topaz
12.12 x 6.09 x 4.96mm
USD 25.40
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ID: 4366771 pcs
thumb image of 2ct Marquise Cabochon Colorless Golden Rutile Quartz (ID: 436677)
1.96ct Rutile Quartz
12.03 x 6.17 x 3.59mm
USD 4.82
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ID: 4328932 pcs
thumb image of 4.5ct Marquise Facet Swiss Blue Topaz (ID: 432893)
4.46ct Topaz
11.89 x 6.08 x 4.34mm
USD 22.30
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ID: 4327542 pcs
thumb image of 3.8ct Marquise Facet Swiss Blue Topaz (ID: 432754)
3.76ct Topaz
11.89 x 6.20 x 4.09mm
USD 18.80
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ID: 4325052 pcs
thumb image of 4.4ct Marquise Facet Swiss Blue Topaz (ID: 432505)
4.36ct Topaz
11.89 x 6.04 x 4.33mm
USD 21.80
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ID: 4331671 pcs
thumb image of 2.5ct Marquise Facet Swiss Blue Topaz (ID: 433167)
2.46ct Topaz
12.25 x 6.14 x 4.45mm
USD 12.30
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ID: 4329022 pcs
thumb image of 3.5ct Marquise Facet Swiss Blue Topaz (ID: 432902)
3.50ct Topaz
12.21 x 6.18 x 3.49mm
USD 17.50
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ID: 4469072 pcs
thumb image of 1.9ct Marquise Cabochon Multicolor Opal Doublet (ID: 446907)
1.94ct Opal Doublet
12.21 x 6.15 x 1.91mm
USD 29.10
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ID: 4331701 pcs
thumb image of 2.2ct Marquise Facet Swiss Blue Topaz (ID: 433170)
2.24ct Topaz
12.11 x 5.95 x 4.34mm
USD 11.20
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ID: 4325042 pcs
thumb image of 4.4ct Marquise Facet Swiss Blue Topaz (ID: 432504)
4.36ct Topaz
12.01 x 6.11 x 4.05mm
USD 21.80
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ID: 4330351 pcs
thumb image of 2.4ct Marquise Facet Swiss Blue Topaz (ID: 433035)
2.37ct Topaz
12.13 x 6.16 x 4.36mm
USD 11.85
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ID: 4329742 pcs
thumb image of 4.2ct Marquise Facet Swiss Blue Topaz (ID: 432974)
4.24ct Topaz
12.02 x 6.10 x 3.97mm
USD 21.20
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ID: 4366661 pcs
thumb image of 2.3ct Marquise Cabochon Colorless Golden Rutile Quartz (ID: 436666)
2.33ct Rutile Quartz
12.00 x 6.05 x 4.37mm
USD 5.73
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ID: 4324952 pcs
thumb image of 4.1ct Marquise Facet Swiss Blue Topaz (ID: 432495)
4.12ct Topaz
12.05 x 6.08 x 4.08mm
USD 20.60
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ID: 4328982 pcs
thumb image of 4.5ct Marquise Facet Swiss Blue Topaz (ID: 432898)
4.51ct Topaz
12.14 x 6.11 x 4.58mm
USD 22.55
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ID: 4329651 pcs
thumb image of 2.1ct Marquise Facet Swiss Blue Topaz (ID: 432965)
2.05ct Topaz
11.97 x 6.00 x 3.85mm
USD 10.25
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ID: 4330461 pcs
thumb image of 2.4ct Marquise Facet Swiss Blue Topaz (ID: 433046)
2.40ct Topaz
12.02 x 6.02 x 4.50mm
USD 12.00
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ID: 4329711 pcs
thumb image of 1.8ct Marquise Facet Swiss Blue Topaz (ID: 432971)
1.83ct Topaz
12.08 x 6.04 x 3.65mm
USD 9.15
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ID: 4327472 pcs
thumb image of 4.9ct Marquise Facet Swiss Blue Topaz (ID: 432747)
4.94ct Topaz
11.92 x 6.08 x 4.94mm
USD 24.70
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ID: 4328942 pcs
thumb image of 4.7ct Marquise Facet Swiss Blue Topaz (ID: 432894)
4.67ct Topaz
12.18 x 6.16 x 4.49mm
USD 23.35
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ID: 4330401 pcs
thumb image of 2.4ct Marquise Facet Swiss Blue Topaz (ID: 433040)
2.35ct Topaz
12.11 x 6.19 x 4.02mm
USD 11.75
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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