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Home › Calibrated Gemstones › Square Shape 13x13 mm Gems

Calibrated Square Cut Gemstones in Size 13x13 mm

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2.48ctw Natural Vivid Violet Amethyst, Oval, VS, Photo A

2.48ctw Natural Vivid Violet Amethyst, Oval, VS

Amethyst

2.48ct total6 pcs
$ 13.59
6 x 4 mm (calibrated)
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2.39ct Natural Multicolor Labradorite, Marquise, Translucent, Photo A

2.39ct Natural Multicolor Labradorite, Marquise, Translucent

Labradorite

2.39ct1 pc
$ 5.29
12 x 6 mm (calibrated)
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22.90ct Natural Light Green Amazonite, Fancy, Opaque, Photo A

22.90ct Natural Light Green Amazonite, Fancy, Opaque

Amazonite

22.90ct1 pc
$ 4.57
37.7 x 9.1 mm
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0.40ct Natural Honey Orange Sphalerite, Round, SI, Photo A

0.40ct Natural Honey Orange Sphalerite, Round, SI

Sphalerite

0.40ct1 pc
$ 19.92
4.2 mm
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0.59ct Natural Medium Orange Sapphire, Oval, VVS-VS, Photo A

0.59ct Natural Medium Orange Sapphire, Oval, VVS-VS

Sapphire

0.59ct1 pc
$ 27.54
6 x 4 mm (calibrated)
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7.32ct Natural Dark Grey Quartz Cat's Eye, Oval, Opaque, Photo A

7.32ct Natural Dark Grey Quartz Cat's Eye, Oval, Opaque

Quartz Cat's Eye

7.32ct1 pc
$ 24.06
12.8 x 10.2 mm
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0.52ct Natural Black Diamond, Round, Opaque, Photo A
Diamond Product Video (668695)

0.52ct Natural Black Diamond, Round, Opaque

Diamond

0.52ct1 pc
$ 414.34
4.5 mm (calibrated)
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9.01ctw Natural Gold Citrine, Oval, VVS-VS, Photo A

9.01ctw Natural Gold Citrine, Oval, VVS-VS

Citrine

9.01ct total2 pcs
$ 69.11
12 x 10 mm (calibrated)
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16.59ctw Natural Multicolor Pietersite, Oval, Opaque, Photo A

16.59ctw Natural Multicolor Pietersite, Oval, Opaque

Pietersite

16.59ct total2 pcs
$ 73.26
20.1 x 13.5 mm
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0.56ct Natural Multicolor Opal, Oval, Opaque, Photo A

0.56ct Natural Multicolor Opal, Oval, Opaque

Opal

0.56ct1 pc
$ 16.73
8 x 6 mm (calibrated)
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0.20ct Natural L Diamond, Round, VVS-VS, Photo A
Diamond Product Video (747214)

0.20ct Natural L Diamond, Round, VVS-VS

Diamond

0.20ct1 pc
$ 335.79
3.7 mm
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2.55ctw Natural Deep Golden Orange Sapphire, Round, VVS-VS, Photo A

2.55ctw Natural Deep Golden Orange Sapphire, Round, VVS-VS

Sapphire

2.55ct total4 pcs
$ 167.77
5 mm (calibrated)
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3.33ctw Natural Lively Green Peridot, Round, VVS-VS, Photo A

3.33ctw Natural Lively Green Peridot, Round, VVS-VS

Peridot

3.33ct total6 pcs
$ 49.75
5 mm (calibrated)
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0.62ct Natural Medium Orange Sapphire, Oval, VVS-VS, Photo A

0.62ct Natural Medium Orange Sapphire, Oval, VVS-VS

Sapphire

0.62ct1 pc
$ 62.74
6 x 4 mm (calibrated)
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17.99ct Natural Bluish White Rainbow Moonstone, Marquise, Transparent, Photo A

17.99ct Natural Bluish White Rainbow Moonstone, Marquise, Transparent

Rainbow Moonstone

17.99ct1 pc
$ 143.34
28.1 x 13 mm
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97.01ct Natural Multicolor Ruby-Zoisite, Oval, Opaque, Photo A
Ruby-Zoisite Product Video (335063)

97.01ct Natural Multicolor Ruby-Zoisite, Oval, Opaque

Ruby-Zoisite

97.01ct1 pc
$ 193.24
27.8 x 22.7 mm
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0.72ct Natural Gold Citrine, Heart, VVS, Photo A

0.72ct Natural Gold Citrine, Heart, VVS

Citrine

0.72ct1 pc
$ 5.02
6 x 6 mm (calibrated)
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1.26ctw Natural Midnight Blue Sapphire, Round, VS, Photo A
Sapphire Product Video (488760)

1.26ctw Natural Midnight Blue Sapphire, Round, VS

Sapphire

1.26ct total2 pcs
$ 414.14
5 mm (calibrated)
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13.91ct Natural Navy Blue Color-Change Fluorite, Round, VS, Photo A
Color-Change Fluorite Product Video (413687)

13.91ct Natural Navy Blue Color-Change Fluorite, Round, VS

Color-Change Fluorite

13.91ct1 pc
$ 381.00
15 mm (calibrated)
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4.04ct Natural Medium-Light Violet Amethyst, Oval, Transparent, Photo A

4.04ct Natural Medium-Light Violet Amethyst, Oval, Transparent

Amethyst

4.04ct1 pc
$ 22.13
12 x 8 mm (calibrated)
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3.27ctw Natural Bluish White Rainbow Moonstone, Square, Transparent/Translucent, Photo A

3.27ctw Natural Bluish White Rainbow Moonstone, Square, Transparent/Translucent

Rainbow Moonstone

3.27ct total20 pcs
$ 70.57
3 x 3 mm (calibrated)
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4.33ctw Natural Swiss Blue Topaz, Oval, VS, Photo A

4.33ctw Natural Swiss Blue Topaz, Oval, VS

Topaz

4.33ct total15 pcs
$ 23.72
4.9 x 3.2 mm
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0.43ct Natural Medium Light-Orange Sapphire, Heart, VS, Photo A

0.43ct Natural Medium Light-Orange Sapphire, Heart, VS

Sapphire

0.43ct1 pc
$ 26.55
4.5 x 4.5 mm
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0.39ct Natural Reddish Orange Sapphire, Oval, VS, Photo A

0.39ct Natural Reddish Orange Sapphire, Oval, VS

Sapphire

0.39ct1 pc
$ 58.27
5 x 4 mm (calibrated)
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8.68ctw Natural Dark Red Hessonite Garnet, Oval, Translucent, Photo A

8.68ctw Natural Dark Red Hessonite Garnet, Oval, Translucent

Hessonite Garnet

8.68ct total2 pcs
$ 47.55
12 x 8 mm (calibrated)
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21.82ct Natural Deep Violet Amethyst, Octagon / Emerald Cut, VVS, Photo A

21.82ct Natural Deep Violet Amethyst, Octagon / Emerald Cut, VVS

Amethyst

21.82ct1 pc
$ 152.13
20 x 15 mm (calibrated)
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3.76ct Natural Orange-Gold Citrine, Cushion, VVS-VS, Photo A

3.76ct Natural Orange-Gold Citrine, Cushion, VVS-VS

Citrine

3.76ct1 pc
$ 28.83
13.9 x 7.9 mm
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0.62ct Natural Dark Pink Sapphire, Oval, VS, Photo A
Sapphire Product Video (748692)

0.62ct Natural Dark Pink Sapphire, Oval, VS

Sapphire

0.62ct1 pc
$ 514.60
5.3 x 4.5 mm
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0.38ct Natural Bright Orange Carnelian, Round, Transparent, Photo A

0.38ct Natural Bright Orange Carnelian, Round, Transparent

Carnelian

0.38ct1 pc
$ 1.90
5 mm (calibrated)
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1.13ctw Natural Medium Green Peridot, Marquise, VS, Photo A

1.13ctw Natural Medium Green Peridot, Marquise, VS

Peridot

1.13ct total2 pcs
$ 9.90
8.1 x 4.1 mm
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1.27ctw Natural Intense Violet Blue Tanzanite, Pear Shape, VS, Photo A

1.27ctw Natural Intense Violet Blue Tanzanite, Pear Shape, VS

Tanzanite

1.27ct total6 pcs
$ 44.27
5 x 3 mm (calibrated)
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4.56ct Natural Gingerbread Brown Smoky Quartz, Round, VS, Photo A

4.56ct Natural Gingerbread Brown Smoky Quartz, Round, VS

Smoky Quartz

4.56ct1 pc
$ 7.49
11.5 mm
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Why Buy Square Shape 13x13 Mm Gems from GemSelect?

GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'

Posted By CJ in March, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

I think therea's no problem

Posted By Napoleon in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy to use. No issues. Large selection of gems.

Posted By CLTCJH in February, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

It was a good interaction I got a good gemstone for cheap

Posted By Jon in December, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Plan on purchasing on an ongoing basis. So far.....so good....

Posted By Jim in January, 2026
Source: Bizrate
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