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Buy Marquise Shape 20x10 mm Gems

(97)
Gem Type Weight Size Clarity Price Origin
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Multicolor Ruby in Fuchsite Gem - 5.1ct Marquise Slice (ID: 385547)

Marquise Multicolor Ruby in Fuchsite

5.06 ct (total 10.12ctw)
19.2 x 9.8 mm
$ 68.11
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2 pcs
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Cool Pine Green Amazonite Gem - 7.8ct Marquise Cabochon (ID: 491601)

Marquise Green Amazonite

7.84 ct (total 15.67ctw)
19.5 x 10.1 mm
$ 34.79
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Pine Green Amazonite Gem - 9.2ct Marquise Cabochon (ID: 491739)

Marquise Green Amazonite

9.17 ct (total 18.33ctw)
20.1 x 10.3 mm
$ 40.69
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Medium Purplish Violet Amethyst Gem - 7.9ct Marquise Facet (ID: 351131)

Marquise Violet Amethyst

7.9ct
19.6 x 10.2 mm
$ 55.51
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Cool Green Amazonite Gem - 9.1ct Marquise Cabochon (ID: 492277)

Marquise Green Amazonite

9.1ct
19.7 x 10.1 mm
$ 20.02
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Medium Green Amazonite Gem - 6.8ct Marquise Cabochon (ID: 491596)

Marquise Green Amazonite

6.75 ct (total 13.50ctw)
19.5 x 10.1 mm
$ 29.97
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Cool Green Amazonite Gem - 6.9ct Marquise Cabochon (ID: 491215)

Marquise Green Amazonite

6.9ct
19.5 x 10.2 mm
$ 15.41
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Grey Green Jadeite Gem - 6.3ct Marquise Cabochon (ID: 421007)

Marquise Green Jadeite

6.3ct
20.5 x 10.1 mm
$ 18.87
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Multicolor Ruby in Fuchsite Gem - 5.5ct Marquise Slice (ID: 386700)

Marquise Multicolor Ruby in Fuchsite

5.5ct
20.1 x 9.8 mm
$ 36.80
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Medium-Dark Green Amazonite Gem - 7.3ct Marquise Cabochon (ID: 492173)

Marquise Green Amazonite

7.3ct
19.9 x 10.3 mm
$ 15.90
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Pine Green Amazonite Gem - 9.6ct Marquise Cabochon (ID: 491220)

Marquise Green Amazonite

9.6ct
19.9 x 10.2 mm
$ 21.34
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2 pcs
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Cool Green Amazonite Gem - 7.9ct Marquise Cabochon (ID: 491598)

Marquise Green Amazonite

7.93 ct (total 15.86ctw)
19.3 x 9.8 mm
$ 35.21
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Cool Green Amazonite Gem - 6.7ct Marquise Cabochon (ID: 492175)

Marquise Green Amazonite

6.7ct
19.3 x 10 mm
$ 14.63
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Medium Purplish Violet Amethyst Gem - 6.2ct Marquise Facet (ID: 351132)

Marquise Violet Amethyst

6.2ct
19.5 x 9.8 mm
$ 43.05
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Multicolor Ruby in Fuchsite Gem - 6.5ct Marquise Slice (ID: 385253)

Marquise Multicolor Ruby in Fuchsite

6.5ct
20.5 x 10.4 mm
$ 44.40
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Medium Green Amazonite Gem - 9.3ct Marquise Cabochon (ID: 491749)

Marquise Green Amazonite

9.28 ct (total 18.56ctw)
20 x 10.2 mm
$ 41.20
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Pine Green Amazonite Gem - 6.8ct Marquise Cabochon (ID: 492179)

Marquise Green Amazonite

6.8ct
20.2 x 10.1 mm
$ 14.94
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Pine Green Amazonite Gem - 7.6ct Marquise Cabochon (ID: 492282)

Marquise Green Amazonite

7.6ct
20.1 x 10 mm
$ 16.64
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2 pcs
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Cool Green Amazonite Gem - 9.2ct Marquise Cabochon (ID: 491599)

Marquise Green Amazonite

9.22 ct (total 18.43ctw)
20 x 10.3 mm
$ 40.91
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Pine Green Amazonite Gem - 6.3ct Marquise Cabochon (ID: 491184)

Marquise Green Amazonite

6.3ct
20.1 x 10.2 mm
$ 13.94
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Clear with Copper Rutile Quartz Gem - 8.9ct Marquise Cabochon (ID: 499719)

Marquise White Rutile Quartz

8.9ct
20.1 x 10.1 mm
$ 22.35
Item in Stock
1 2 3 4 5
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.

Certified Customer Reviews
Overall Rating -> 10 star ratings
GemSelect has a wonderful well described selection that surprises me how quickly it ships.
Posted By Tim in December, 2019
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Overall Rating -> 10 star ratings
They have the best selection of different gems and the prices and fantastic
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Overall Rating -> 9 star ratings
Very clear site. The photos and video make sure you know exactly what you are getting. I also appreciate all of the additional info. and definitions/explanations offered
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Overall Rating -> 10 star ratings
Working on a special anniversary gem collection for my wife, and was able to find almost everything on this one site. Having bought from yall before, this was a no-brainer on where to go for the right stones/buying experience.
Posted By ESP in December, 2019
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Overall Rating -> 10 star ratings
Great products and very customer friendly. Will be purchasing again. Thanks!
Posted By Joe in December, 2019
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Overall Rating -> 9 star ratings
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More Shapes
  • Asscher Cut
  • Baguette / Scissor Cut
  • Baguette Cabochon
  • Baguette Checkerboard
  • Baguette Crystal Cluster
  • Baguette Facet
  • Baguette Rose-Cut
  • Baguette Step Cut
  • Baguette Sugarloaf Cabochon
  • Baroque
  • Barrel
  • Barrel / Checkerboard
  • Barrel / Full-Round
  • Barrel / Scissor Cut
  • Barrel Cabochon
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  • Bear Carving with Hole
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  • Carved Baguette
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  • Carved Fancy
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  • Carved Flower
  • Carved Fruit
  • Carved Half Heart
  • Carved Half Moon
  • Carved Heart
  • Carved Heart Cabochon
  • Carved Leaf
  • Carved Marquise
  • Carved Marquise Cabochon
  • Carved Octagon
  • Carved Oval
  • Carved Oval Cabochon
  • Carved Owl
  • Carved Pear
  • Carved Pear Cabochon
  • Carved Rhomb
  • Carved Rose
  • Carved Rose with Half Drilled Hole
  • Carved Round
  • Carved Round Cabochon
  • Carved Sheep
  • Carved Shell
  • Carved Square
  • Carved Teardrop
  • Carved Trillion
  • Carved Turtle
  • Cushion Buff-Top
  • Cushion Cabochon
  • Cushion Carved Medusa Cameo
  • Cushion Checkerboard
  • Cushion Checkerboard (double sided)
  • Cushion Concave Fantasy Cut
  • Cushion Crystal Cluster
  • Cushion Mixed Cut
  • Cushion Rose-Cut
  • Cushion Shape Sugarloaf Cabochon
  • Cushion Sugarloaf Cabochon
  • Cushion-Cut
  • Diamond-Cut
  • Drilled Faceted Sphere
  • Drilled Sphere
  • Drilled Square Rondelle Slice
  • Drop / Pear
  • Fancy Cabochon
  • Fancy Carved Cushion
  • Fancy Carved Oval
  • Fancy Carved Pear
  • Fancy Carved Round
  • Fancy Carved Trillion
  • Fancy Carving
  • Fancy Crystal Cluster
  • Fancy Facet
  • Fancy Fantasy Carved Leaf
  • Fancy Fantasy Carving
  • Fancy Slice
  • Fancy Star Facet
  • Fancy-Cut
  • Fantasy Carved Flower
  • Fantasy Carved Flower Cut
  • Fantasy Carved Leaf
  • Flower Carving
  • Flower-Cut
  • Half Heart Cabochon
  • Half Heart Facet
  • Half Moon Cabochon
  • Half Moon Facet-Cut
  • Half Moon Faceted
  • Half-Drilled Briolette
  • Half-Drilled Heart Checkerboard Facet
  • Half-Drilled Sphere
  • Heart Cabochon
  • Heart Checkerboard (double sided)
  • Heart Facet
  • Heart Rose-Cut
  • Hexagon Cut
  • Marquise Buff-Top
  • Marquise Cabochon
  • Marquise Checkerboard
  • Marquise Checkerboard (double sided)
  • Marquise Facet
  • Marquise Mixed Cut
  • Marquise Slice
  • Marquise Sugarloaf Cabochon
  • Octagon / Scissor Cut
  • Octagon Cabochon
  • Octagon Checkerboard
  • Octagon Facet
  • Octagon Step Cut
  • Oval Buff-Top
  • Oval Cabochon
  • Oval Cabochon with Hole
  • Oval Carved Cameo
  • Oval Checkerboard
  • Oval Checkerboard (double sided)
  • Oval Concave Cut
  • Oval Crystal Cluster
  • Oval Diamond-Cut
  • Oval Facet
  • Oval Fancy Facet
  • Oval Fantasy Concave Cut
  • Oval Mixed Cut
  • Oval Portuguese-Cut
  • Oval Rose-Cut
  • Oval Slice
  • Pear Cabochon
  • Pear Checkerboard
  • Pear Checkerboard with Hole
  • Pear Concave Cut
  • Pear Concave Fantasy Cut
  • Pear Crystal Cluster
  • Pear Double-Sided Checkerboard
  • Pear Facet
  • Pear Shape Sugarloaf Cabochon
  • Pear Slice
  • Pencil
  • Pencil Cut
  • Pentagon Facet
  • Princess-Cut
  • Rhomb Cabochon
  • Rhomb Checkerboard
  • Rhomb Checkerboard (Double-Sided)
  • Rhomb Facet
  • Rondelle
  • Round Buff-Top
  • Round Cabochon
  • Round Carved Cameo
  • Round Checkerboard
  • Round Checkerboard (double sided)
  • Round Concave Cut
  • Round Concave Fantasy Cut
  • Round Drilled Checkerboard (Double Sided)
  • Round Drilled Rondelle
  • Round Facet
  • Round Mixed Cut
  • Round Mixed-Cut
  • Round Petal Cut
  • Round Portuguese-Cut
  • Round Rose-Cut
  • Round Rose-Cut (double sided)
  • Shark Fin Cabochon
  • Shield Cabochon
  • Shield Checkboard
  • Spherical
  • Square / Scissor Cut
  • Square Cabochon
  • Square Facet
  • Square Rose-Cut
  • Square Step-Cut
  • Square Sugarloaf Cabochon
  • Square with Hole
  • Tapered Baguette
  • Tapered Baguette Cabochon
  • Teardrop Cabochon
  • Trapezoid
  • Trapezoid Cabochon
  • Trapezoid Checkerboard
  • Triangle
  • Triangle Cabochon
  • Trillion Cabochon
  • Trillion Checkerboard
  • Trillion Concave Cut
  • Trillion Concave Fantasy Cut
  • Trillion Crystal Cluster
  • Trillion Facet
  • Trillion Rose-Cut
  • Trillion Shape Sugarloaf Cabochon
  • Undrilled Briolette Teardrop
Popular Gemstones
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All Gemstones (144)
A B C D E F G H I J K L M N O P Q R S T V Z
  • Actinolite Cat's Eye
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  • Fire Opal
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  • Howlite
  • Idocrase
  • Imperial Topaz
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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