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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (130): Oval Shape 18x13 mm Gems Clear All
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ID: 3477042 pcs
thumb image of 16.8ct Oval Cabochon Grayish Blue Pietersite (ID: 347704)
16.77 ct Pietersite
18.3 x 13.2 mm
$ 67.08
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ID: 3342521 pcs
thumb image of 21.2ct Oval Cabochon Pink Rose Quartz (ID: 334252)
21.24 ct Rose Quartz
18.1 x 13.1 mm
$ 25.91
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ID: 4382952 pcs
thumb image of 25.1ct Oval Rose-Cut Black Spinel (ID: 438295)
25.08 ct Spinel
18.2 x 13.1 mm
$ 75.24
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ID: 3287511 pcs
thumb image of 20.3ct Oval Cabochon Pink Rose Quartz (ID: 328751)
20.28 ct Rose Quartz
18.3 x 13.2 mm
$ 24.34
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ID: 3468592 pcs
thumb image of 16.4ct Oval Cabochon Violet Charoite (ID: 346859)
16.41 ct Charoite
18.1 x 13.2 mm
$ 24.62
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ID: 3708371 pcs
thumb image of 12.3ct Oval Cabochon Multicolor Jasper (ID: 370837)
12.30 ct Jasper
18.2 x 13.2 mm
$ 12.30
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ID: 3717202 pcs
thumb image of 14.3ct Oval Cabochon Grayish Blue Pietersite (ID: 371720)
14.30 ct Pietersite
18.2 x 13.2 mm
$ 57.20
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ID: 2735241 pcs
thumb image of 9.7ct Oval Cabochon Greyish White Howlite (ID: 273524)
9.74 ct Howlite
17.8 x 12.9 mm
$ 24.35
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ID: 3224361 pcs
thumb image of 9.2ct Oval Cabochon Greyish White Howlite (ID: 322436)
9.15 ct Howlite
18.1 x 13.1 mm
$ 22.88
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ID: 4564021 pcs
thumb image of 13.7ct Oval Cabochon Multicolor Pietersite (ID: 456402)
13.65 ct Pietersite
18.2 x 13 mm
$ 31.80
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ID: 3707662 pcs
thumb image of 19.6ct Oval Cabochon Multicolor Jasper (ID: 370766)
19.64 ct Jasper
18.1 x 13.1 mm
$ 19.64
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ID: 3877761 pcs
thumb image of 16ct Oval Portuguese-Cut Bi-Color Ametrine (ID: 387776)
15.97 ct Ametrine
18 x 12.9 mm
$ 111.79
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ID: 4564032 pcs
thumb image of 25.7ct Oval Cabochon Multicolor Pietersite (ID: 456403)
25.68 ct Pietersite
18.2 x 13.1 mm
$ 59.83
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ID: 3707602 pcs
thumb image of 23.5ct Oval Cabochon Multicolor Jasper (ID: 370760)
23.48 ct Jasper
18 x 13.2 mm
$ 23.48
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ID: 4573162 pcs
thumb image of 24.2ct Oval Cabochon Multicolor Pietersite (ID: 457316)
24.17 ct Pietersite
18 x 13.2 mm
$ 56.32
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ID: 1968551 pcs
thumb image of 13.4ct Oval Cabochon Multicolor Ruby-Zoisite (ID: 196855)
13.35 ct Ruby-Zoisite
18.2 x 13 mm
$ 40.05
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ID: 3641101 pcs
thumb image of 7.9ct Oval Cabochon Multicolor Jasper (ID: 364110)
7.89 ct Jasper
18 x 13 mm
$ 15.78
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ID: 3342921 pcs
thumb image of 16.8ct Oval Cabochon Pink Rose Quartz (ID: 334292)
16.81 ct Rose Quartz
18.3 x 13.2 mm
$ 20.51
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ID: 4589261 pcs
thumb image of 9ct Oval Cabochon Blue Lapis Lazuli (ID: 458926)
9.04 ct Lapis Lazuli
17.9 x 13 mm
$ 9.04
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ID: 3707622 pcs
thumb image of 20.7ct Oval Cabochon Multicolor Jasper (ID: 370762)
20.66 ct Jasper
17.9 x 13.2 mm
$ 20.66
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ID: 3342961 pcs
thumb image of 16.3ct Oval Cabochon Pink Rose Quartz (ID: 334296)
16.25 ct Rose Quartz
18 x 13.3 mm
$ 19.82
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Oval Shape 18x13 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 oval shapes, facet cut and cabochon gems available now in 18 x13 mm size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. 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