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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (154): Oval Shape 18x13 mm Gems Clear All
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ID: 3329261 pcs
thumb image of 18.9ct Oval Cabochon Pink Rose Quartz (ID: 332926)
18.91 ct Rose Quartz
18 x 13.2 mm
$ 22.69
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ID: 3329241 pcs
thumb image of 17.8ct Oval Cabochon Pink Rose Quartz (ID: 332924)
17.78 ct Rose Quartz
17.8 x 13.2 mm
$ 21.34
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ID: 3329321 pcs
thumb image of 20ct Oval Cabochon Pink Rose Quartz (ID: 332932)
19.98 ct Rose Quartz
18.1 x 13.2 mm
$ 23.98
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ID: 3707612 pcs
thumb image of 18.6ct Oval Cabochon Multicolor Jasper (ID: 370761)
18.63 ct Jasper
18 x 13.2 mm
$ 18.63
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ID: 4462281 pcs
thumb image of 12ct Oval Facet Yellow Golden Citrine (ID: 446228)
11.96 ct Citrine
18.3 x 13.2 mm
$ 71.76
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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: 3920062 pcs
thumb image of 29.6ct Oval Cabochon Multicolor Rhodochrosite (ID: 392006)
29.63 ct Rhodochrosite
18 x 12.9 mm
$ 59.26
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ID: 3496311 pcs
thumb image of 10.2ct Oval Cabochon Violet Charoite (ID: 349631)
10.16 ct Charoite
18.2 x 13 mm
$ 30.48
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ID: 3707592 pcs
thumb image of 20.6ct Oval Cabochon Multicolor Jasper (ID: 370759)
20.64 ct Jasper
18 x 13.1 mm
$ 20.64
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ID: 3534771 pcs
thumb image of 21ct Oval Cabochon Cream Moonstone (ID: 353477)
20.99 ct Moonstone
17.9 x 13 mm
$ 41.98
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ID: 3342461 pcs
thumb image of 18.6ct Oval Cabochon Pink Rose Quartz (ID: 334246)
18.62 ct Rose Quartz
17.9 x 13 mm
$ 22.72
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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: 3718392 pcs
thumb image of 16.4ct Oval Cabochon Grayish Blue Pietersite (ID: 371839)
16.38 ct Pietersite
17.9 x 13.1 mm
$ 65.52
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ID: 4495461 pcs
thumb image of 12.7ct Oval Cabochon Orange Red Carnelian (ID: 449546)
12.70 ct Carnelian
17.7 x 13 mm
$ 63.50
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ID: 3913061 pcs
thumb image of 14.3ct Oval Cabochon Violet Amethyst (ID: 391306)
14.28 ct Amethyst
18 x 13.1 mm
$ 99.96
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ID: 3920082 pcs
thumb image of 31.2ct Oval Cabochon Multicolor Rhodochrosite (ID: 392008)
31.19 ct Rhodochrosite
18.2 x 13.2 mm
$ 62.38
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ID: 3846291 pcs
thumb image of 14.8ct Oval Facet White Topaz (ID: 384629)
14.82 ct Topaz
18.1 x 12.9 mm
$ 103.74
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ID: 3641282 pcs
thumb image of 16.8ct Oval Cabochon Multicolor Jasper (ID: 364128)
16.76 ct Jasper
18.1 x 13.2 mm
$ 33.52
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ID: 4382851 pcs
thumb image of 13.7ct Oval Rose-Cut Black Spinel (ID: 438285)
13.71 ct Spinel
18.1 x 13.1 mm
$ 41.13
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ID: 3578791 pcs
thumb image of 8.8ct Oval Cabochon Violet Charoite (ID: 357879)
8.76 ct Charoite
17.8 x 13.1 mm
$ 26.28
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ID: 3825641 pcs
thumb image of 14.2ct Oval Cabochon Pastel Green Jadeite (ID: 382564)
14.22 ct Jadeite
17.7 x 13.2 mm
$ 99.54
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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