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  : Marquise Shape 20x10 mm Gems
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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (7): Marquise Shape 20x10 mm Gems Clear All
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ID: 3855502 pcs
thumb image of 11ct Marquise Slice Bi-Color Ruby in Fuchsite (ID: 385550)
10.97 ct Ruby in Fuchsite
19.9 x 9.9 mm
$ 73.83
Item in Stock
ID: 3867001 pcs
thumb image of 5.5ct Marquise Slice Bi-Color Ruby in Fuchsite (ID: 386700)
5.46 ct Ruby in Fuchsite
20.1 x 9.8 mm
$ 36.80
Item in Stock
ID: 3864141 pcs
thumb image of 5ct Marquise Slice Bi-Color Ruby in Fuchsite (ID: 386414)
4.95 ct Ruby in Fuchsite
20 x 9.9 mm
$ 33.36
Item in Stock
ID: 3511361 pcs
thumb image of 7.6ct Marquise Facet Violet Amethyst (ID: 351136)
7.61 ct Amethyst
20 x 10.2 mm
$ 53.27
Item in Stock
ID: 4168351 pcs
thumb image of 7.1ct Marquise Checkerboard (double sided) Brown Smoky Quartz (ID: 416835)
7.09 ct Smoky Quartz
19.9 x 10 mm
$ 10.64
Item in Stock
ID: 3523391 pcs
thumb image of 9ct Marquise Facet Violet Amethyst (ID: 352339)
8.95 ct Amethyst
19.9 x 10.1 mm
$ 62.65
Item in Stock
ID: 4389741 pcs
thumb image of 8.6ct Marquise Cabochon Colorless Rutile Quartz (ID: 438974)
8.58 ct Rutile Quartz
20.1 x 10.2 mm
$ 18.62
Item in Stock
Marquise Shape 20x10 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 20 mm x 10 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