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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (166): Oval Shape 18x13 mm Gems Clear All
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ID: 3707531 pcs
thumb image of 10.4ct Oval Cabochon Multicolor Jasper (ID: 370753)
10.37 ct Jasper
18 x 13.1 mm
$ 10.37
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ID: 3712331 pcs
thumb image of 10.4ct Oval Cabochon Multicolor Jasper (ID: 371233)
10.40 ct Jasper
17.9 x 13.1 mm
$ 10.40
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ID: 4495481 pcs
thumb image of 12.1ct Oval Cabochon Orange Red Carnelian (ID: 449548)
12.14 ct Carnelian
18 x 13 mm
$ 60.70
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ID: 4495501 pcs
thumb image of 14.2ct Oval Cabochon Orange Red Carnelian (ID: 449550)
14.20 ct Carnelian
17.9 x 13.1 mm
$ 71.00
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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: 3226871 pcs
thumb image of 9.5ct Oval Cabochon Greyish White Howlite (ID: 322687)
9.53 ct Howlite
17.8 x 13.1 mm
$ 23.82
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ID: 3224411 pcs
thumb image of 9.4ct Oval Cabochon Greyish White Howlite (ID: 322441)
9.40 ct Howlite
18 x 13 mm
$ 23.50
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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: 2735181 pcs
thumb image of 8.8ct Oval Cabochon Greyish White Howlite (ID: 273518)
8.82 ct Howlite
18.3 x 13.2 mm
$ 22.05
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ID: 3477171 pcs
thumb image of 7.7ct Oval Cabochon Grayish Blue Pietersite (ID: 347717)
7.68 ct Pietersite
18.1 x 13.2 mm
$ 30.72
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ID: 4577182 pcs
thumb image of 19.5ct Oval Cabochon Blue Lapis Lazuli (ID: 457718)
19.52 ct Lapis Lazuli
17.7 x 13 mm
$ 19.52
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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: 2881852 pcs
thumb image of 20.7ct Oval Cabochon Green Seraphinite (ID: 288185)
20.69 ct Seraphinite
18 x 13.1 mm
$ 35.17
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ID: 2662761 pcs
thumb image of 19.8ct Oval Cabochon Multicolor Ruby-Zoisite (ID: 266276)
19.75 ct Ruby-Zoisite
18.2 x 12.9 mm
$ 54.31
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ID: 3707582 pcs
thumb image of 19.1ct Oval Cabochon Multicolor Jasper (ID: 370758)
19.12 ct Jasper
18 x 13.1 mm
$ 19.12
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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: 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: 3920551 pcs
thumb image of 15.9ct Oval Cabochon Multicolor Rhodochrosite (ID: 392055)
15.86 ct Rhodochrosite
17.9 x 12.9 mm
$ 31.72
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ID: 3920591 pcs
thumb image of 17ct Oval Cabochon Multicolor Rhodochrosite (ID: 392059)
17.03 ct Rhodochrosite
18 x 13 mm
$ 34.06
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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: 3496341 pcs
thumb image of 10.8ct Oval Cabochon Violet Charoite (ID: 349634)
10.82 ct Charoite
18.1 x 13.2 mm
$ 32.46
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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