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Home › Calibrated Gemstones › Square Shape 13x13 mm Gems

Calibrated Square Cut Gemstones in Size 13x13 mm

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2.84ctw Natural Clear White Topaz, Cushion, VVS-VS, Photo A

2.84ctw Natural Clear White Topaz, Cushion, VVS-VS

Topaz

2.84ct total6 pcs
$ 15.55
4.6 x 4.5 mm
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1.34ct Natural Earthy Green Tourmaline, Octagon / Emerald Cut, VS, Photo A

1.34ct Natural Earthy Green Tourmaline, Octagon / Emerald Cut, VS

Tourmaline

1.34ct1 pc
$ 32.30
18.7 x 3.1 mm
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14.88ct Natural Dark Red Star Garnet, Oval, Opaque, Photo A

14.88ct Natural Dark Red Star Garnet, Oval, Opaque

Star Garnet

14.88ct1 pc
$ 14.67
15 x 11.8 mm
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23.45ct Natural Multicolor Boulder Opal, Fancy, Opaque, Photo A
Boulder Opal Product Video (718511)

23.45ct Natural Multicolor Boulder Opal, Fancy, Opaque

Boulder Opal

23.45ct1 pc
$ 116.78
21.7 x 17.9 mm
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14.31ctw Natural Multicolor Pietersite, Fancy, Opaque, Photo A

14.31ctw Natural Multicolor Pietersite, Fancy, Opaque

Pietersite

14.31ct total2 pcs
$ 54.02
25.5 x 10.1 mm
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1.15ct Natural Light Golden Yellow Color-Change Diaspore, Pear Shape, VS, Photo A

1.15ct Natural Light Golden Yellow Color-Change Diaspore, Pear Shape, VS

Color-Change Diaspore

1.15ct1 pc
$ 61.29
10.6 x 5.5 mm
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57.61ct Natural Medium Yellow Quartz, Oval, Transparent, Photo A

57.61ct Natural Medium Yellow Quartz, Oval, Transparent

Quartz

57.61ct1 pc
$ 47.82
31 x 24.9 mm
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0.26ctw Natural Warm Forest Green Kornerupine, Oval, VS, Photo A

0.26ctw Natural Warm Forest Green Kornerupine, Oval, VS

Kornerupine

0.26ct total2 pcs
$ 14.24
3.6 x 2.7 mm
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0.02ct Natural Black Diamond, Round, Opaque, Photo A

0.02ct Natural Black Diamond, Round, Opaque

Diamond

0.02ct1 pc
$ 15.94
2 mm (calibrated)
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3.39ct Natural Light Yellow Prehnite, Oval, Transparent/Translucent, Photo A

3.39ct Natural Light Yellow Prehnite, Oval, Transparent/Translucent

Prehnite

3.39ct1 pc
$ 31.79
10 x 7 mm (calibrated)
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0.79ct Natural Dark Green Tourmaline, Baguette, VVS-VS, Photo A

0.79ct Natural Dark Green Tourmaline, Baguette, VVS-VS

Tourmaline

0.79ct1 pc
$ 27.54
5.9 x 3 mm
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47.57ct Natural Multicolor Jasper, Oval, Opaque, Photo A

47.57ct Natural Multicolor Jasper, Oval, Opaque

Jasper

47.57ct1 pc
$ 44.06
35.1 x 25.1 mm
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3.45ct Natural Light Pink Kunzite, Cushion, VVS, Photo A

3.45ct Natural Light Pink Kunzite, Cushion, VVS

Kunzite

3.45ct1 pc
$ 94.94
8.5 x 8.1 mm
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4.59ctw Natural Sky Blue Topaz, Oval, VVS-VS, Photo A

4.59ctw Natural Sky Blue Topaz, Oval, VVS-VS

Topaz

4.59ct total4 pcs
$ 25.20
7 x 5 mm (calibrated)
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1.60ct Natural Deep Orange Hessonite Garnet, Cushion, VS, Photo A

1.60ct Natural Deep Orange Hessonite Garnet, Cushion, VS

Hessonite Garnet

1.60ct1 pc
$ 23.85
7 x 7 mm (calibrated)
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2.63ct Natural Eggplant Violet Amethyst, Trillion, VVS, Photo A

2.63ct Natural Eggplant Violet Amethyst, Trillion, VVS

Amethyst

2.63ct1 pc
$ 18.33
10 x 10 mm (calibrated)
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3.78ctw Natural Multicolor Andalusite, Oval, VS-SI, Photo A

3.78ctw Natural Multicolor Andalusite, Oval, VS-SI

Andalusite

3.78ct total9 pcs
$ 169.42
6 x 4 mm (calibrated)
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1.54ctw Natural Bluish White Rainbow Moonstone, Pear Shape, Transparent, Photo A

1.54ctw Natural Bluish White Rainbow Moonstone, Pear Shape, Transparent

Rainbow Moonstone

1.54ct total4 pcs
$ 28.68
5 x 5 mm (calibrated)
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11.06ct Natural Dark Red Pyrope Garnet, Oval, VVS, Photo A

11.06ct Natural Dark Red Pyrope Garnet, Oval, VVS

Pyrope Garnet

11.06ct1 pc
$ 321.29
13.6 x 11.4 mm
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33.02ct Natural Medium Gray Hematite, Round, Opaque, Photo A

33.02ct Natural Medium Gray Hematite, Round, Opaque

Hematite

33.02ct1 pc
$ 32.20
20 mm (calibrated)
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3.52ctw Natural Fire Orange Hessonite Garnet, Cushion, VS-SI, Photo A

3.52ctw Natural Fire Orange Hessonite Garnet, Cushion, VS-SI

Hessonite Garnet

3.52ct total2 pcs
$ 77.13
7 x 7 mm (calibrated)
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7.21ctw Natural Light Purplish Blue Tanzanite, Oval, Transparent, Photo A

7.21ctw Natural Light Purplish Blue Tanzanite, Oval, Transparent

Tanzanite

7.21ct total2 pcs
$ 62.40
10 x 8.3 mm
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2.63ctw Natural Sky Blue Topaz, Trillion, VS, Photo A

2.63ctw Natural Sky Blue Topaz, Trillion, VS

Topaz

2.63ct total2 pcs
$ 20.17
7 x 7 mm (calibrated)
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19.19ct Natural Multicolor Agate, Fancy, Opaque, Photo A

19.19ct Natural Multicolor Agate, Fancy, Opaque

Agate

19.19ct1 pc
$ 33.61
19.4 x 9.9 mm
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8.46ctw Natural Swiss Blue Topaz, Marquise, VVS, Photo A

8.46ctw Natural Swiss Blue Topaz, Marquise, VVS

Topaz

8.46ct total2 pcs
$ 59.60
14 x 8.1 mm
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0.32ct Natural Bright Orange Sapphire, Heart, VVS, Photo A

0.32ct Natural Bright Orange Sapphire, Heart, VVS

Sapphire

0.32ct1 pc
$ 19.76
4.6 x 4.4 mm
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3.93ct Natural Golden Orange Citrine, Oval, VVS, Photo A

3.93ct Natural Golden Orange Citrine, Oval, VVS

Citrine

3.93ct1 pc
$ 19.57
11.2 x 9.4 mm
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8.31ctw Natural Black Onyx, Heart, Opaque, Photo A

8.31ctw Natural Black Onyx, Heart, Opaque

Onyx

8.31ct total2 pcs
$ 8.28
10.4 x 10.4 mm
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0.58ct Natural Light Green Emerald, Oval, Translucent, Photo A

0.58ct Natural Light Green Emerald, Oval, Translucent

Emerald

0.58ct1 pc
$ 46.21
5.5 x 4.5 mm
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2.71ct Natural Deep Blood Red Almandine Garnet, Pear Shape, VS, Photo A

2.71ct Natural Deep Blood Red Almandine Garnet, Pear Shape, VS

Almandine Garnet

2.71ct1 pc
$ 22.49
12 x 8 mm (calibrated)
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4.19ct Natural Multicolor Fire Agate, Fancy, Opaque, Photo A

4.19ct Natural Multicolor Fire Agate, Fancy, Opaque

Fire Agate

4.19ct1 pc
$ 59.03
12.2 x 8.9 mm
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1.38ct Natural Tuscany Yellow Golden Beryl, Oval, VS, Photo A

1.38ct Natural Tuscany Yellow Golden Beryl, Oval, VS

Golden Beryl

1.38ct1 pc
$ 33.27
9 x 7 mm (calibrated)
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Why Buy Square Shape 13x13 Mm Gems from GemSelect?

GemSelect Certified Store Reviews

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Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 2025
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Overall Rating -> 10 star ratings

I have been very happy with my prior purchases and enjoy the website experience.

Posted By Trouble in November, 2025
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Overall Rating -> 10 star ratings

Very large selection from affordable to high end I will be coming back to shop again!

Posted By GreenGator in August, 2025
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Overall Rating -> 8 star ratings

Good prices

Posted By TRM in October, 2025
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Overall Rating -> 10 star ratings

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

Posted By CLTCJH in February, 2026
Source: Bizrate
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