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Home › Calibrated Gemstones › Square Shape 13x13 mm Gems

Calibrated Square Cut Gemstones in Size 13x13 mm

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3.72ct Natural Multicolor Black Opal, Round, Translucent, Photo A

3.72ct Natural Multicolor Black Opal, Round, Translucent

Black Opal

3.72ct1 pc
$ 108.37
11.5 mm
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1.07ct Natural Light Green Emerald, Oval, Translucent, Photo A

1.07ct Natural Light Green Emerald, Oval, Translucent

Emerald

1.07ct1 pc
$ 85.26
6.8 x 5.8 mm
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3.20ct Natural Medium Dark-Golden Citrine, Oval, VVS-VS, Photo A

3.20ct Natural Medium Dark-Golden Citrine, Oval, VVS-VS

Citrine

3.20ct1 pc
$ 22.31
11 x 9 mm (calibrated)
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2.45ct Natural Light Greenish Yellow Quartz, Flower Cut, Transparent, Photo A

2.45ct Natural Light Greenish Yellow Quartz, Flower Cut, Transparent

Quartz

2.45ct1 pc
$ 9.40
9.6 x 9.4 mm
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3.11ct Natural Light Pink Rose Quartz, Octagon / Emerald Cut, Transparent, Photo A

3.11ct Natural Light Pink Rose Quartz, Octagon / Emerald Cut, Transparent

Rose Quartz

3.11ct1 pc
$ 17.04
9 x 9 mm (calibrated)
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1.24ct Natural Brownish Yellow Color-Change Diaspore, Cushion, VVS-VS, Photo A

1.24ct Natural Brownish Yellow Color-Change Diaspore, Cushion, VVS-VS

Color-Change Diaspore

1.24ct1 pc
$ 63.85
8 x 5 mm (calibrated)
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9.67ct Natural Forest Green Bloodstone, Marquise, Opaque, Photo A

9.67ct Natural Forest Green Bloodstone, Marquise, Opaque

Bloodstone

9.67ct1 pc
$ 21.18
19.1 x 10 mm
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33.16ct Natural Multicolor Jasper, Fancy, Opaque, Photo A

33.16ct Natural Multicolor Jasper, Fancy, Opaque

Jasper

33.16ct1 pc
$ 9.91
37.2 x 10.8 mm
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1.38ct Natural Light Pink Morganite, Round, VS, Photo A

1.38ct Natural Light Pink Morganite, Round, VS

Morganite

1.38ct1 pc
$ 75.60
7.5 mm (calibrated)
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3.14ct Natural Medium Green Agate, Flower Cut, Translucent, Photo A

3.14ct Natural Medium Green Agate, Flower Cut, Translucent

Agate

3.14ct1 pc
$ 7.82
18.3 x 9 mm
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0.80ct Natural Pinkish Red Ruby, Round, VS-SI, Photo A

0.80ct Natural Pinkish Red Ruby, Round, VS-SI

Ruby

0.80ct1 pc
$ 285.59
5.5 mm (calibrated)
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2.58ctw Natural Deep Red Pyrope Garnet, Marquise, VVS-VS, Photo A

2.58ctw Natural Deep Red Pyrope Garnet, Marquise, VVS-VS

Pyrope Garnet

2.58ct total2 pcs
$ 22.61
10.2 x 5.2 mm
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14.48ct Natural Dark Red Ruby, Oval, Translucent, Photo A

14.48ct Natural Dark Red Ruby, Oval, Translucent

Ruby

14.48ct1 pc
$ 380.74
16 x 12 mm (calibrated)
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2.62ctw Natural Light Yellow Quartz, Flower Cut, Transparent, Photo A

2.62ctw Natural Light Yellow Quartz, Flower Cut, Transparent

Quartz

2.62ct total2 pcs
$ 10.05
8 x 8 mm (calibrated)
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0.76ct Natural Yellowish Green Peridot, Octagon / Emerald Cut, VVS-VS, Photo A

0.76ct Natural Yellowish Green Peridot, Octagon / Emerald Cut, VVS-VS

Peridot

0.76ct1 pc
$ 11.35
6.7 x 4.8 mm
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4.63ct Natural Black Star Sapphire, Oval, Opaque, Photo A

4.63ct Natural Black Star Sapphire, Oval, Opaque

Star Sapphire

4.63ct1 pc
$ 83.01
10.2 x 8.5 mm
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20.74ctw Natural Multicolor Fluorite, Pear Shape, Transparent, Photo A

20.74ctw Natural Multicolor Fluorite, Pear Shape, Transparent

Fluorite

20.74ct total2 pcs
$ 86.07
24.2 x 12.4 mm
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1.43ctw Natural Deep Blood Red Pyrope Garnet, Pear Shape, VVS-VS, Photo A

1.43ctw Natural Deep Blood Red Pyrope Garnet, Pear Shape, VVS-VS

Pyrope Garnet

1.43ct total2 pcs
$ 11.40
6.7 x 4.7 mm
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1.91ct Natural Medium Pink Tourmaline, Oval, VS, Photo A
Tourmaline Product Video (743192)

1.91ct Natural Medium Pink Tourmaline, Oval, VS

Tourmaline

1.91ct1 pc
$ 221.94
8.8 x 7.9 mm
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2.61ctw Natural Sky Blue Topaz, Trillion, VVS-VS, Photo A

2.61ctw Natural Sky Blue Topaz, Trillion, VVS-VS

Topaz

2.61ct total2 pcs
$ 20.02
7 x 7 mm (calibrated)
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3.70ct Natural Warm Brown Tiger's Eye, Oval, Opaque, Photo A

3.70ct Natural Warm Brown Tiger's Eye, Oval, Opaque

Tiger's Eye

3.70ct1 pc
$ 3.69
12 x 8 mm (calibrated)
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10.03ct Natural Multicolor Agate, Oval, Opaque, Photo A

10.03ct Natural Multicolor Agate, Oval, Opaque

Agate

10.03ct1 pc
$ 16.98
13.8 x 12.6 mm
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0.91ctw Natural Light Lively Green Peridot, Pear Shape, VVS-VS, Photo A

0.91ctw Natural Light Lively Green Peridot, Pear Shape, VVS-VS

Peridot

0.91ct total2 pcs
$ 7.98
6 x 4 mm (calibrated)
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6.61ct Natural Light Greenish Blue Larimar, Oval, Opaque, Photo A

6.61ct Natural Light Greenish Blue Larimar, Oval, Opaque

Larimar

6.61ct1 pc
$ 78.92
15 x 10 mm (calibrated)
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0.94ct Natural Merlot Red Rhodolite Garnet, Pear Shape, VS, Photo A

0.94ct Natural Merlot Red Rhodolite Garnet, Pear Shape, VS

Rhodolite Garnet

0.94ct1 pc
$ 24.97
7 x 5 mm (calibrated)
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1.38ct Natural Light Orange Sunstone, Oval, Translucent, Photo A

1.38ct Natural Light Orange Sunstone, Oval, Translucent

Sunstone

1.38ct1 pc
$ 8.25
8.4 x 6.5 mm
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2.55ct Natural Rose Pink Strawberry Quartz, Oval, Transparent, Photo A

2.55ct Natural Rose Pink Strawberry Quartz, Oval, Transparent

Strawberry Quartz

2.55ct1 pc
$ 12.70
9 x 7 mm (calibrated)
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2.26ct Natural Deep Orange Hessonite Garnet, Oval, VS, Photo A

2.26ct Natural Deep Orange Hessonite Garnet, Oval, VS

Hessonite Garnet

2.26ct1 pc
$ 32.19
9 x 7 mm (calibrated)
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3.67ctw Natural Medium Green Prehnite, Round, Transparent, Photo A

3.67ctw Natural Medium Green Prehnite, Round, Transparent

Prehnite

3.67ct total2 pcs
$ 16.62
7.5 mm (calibrated)
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2.70ct Natural Medium Purplish Violet Amethyst, Trillion, VS, Photo A

2.70ct Natural Medium Purplish Violet Amethyst, Trillion, VS

Amethyst

2.70ct1 pc
$ 17.75
10 x 10 mm (calibrated)
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0.03ct Natural Green Diamond, Square, VS-SI, Photo A

0.03ct Natural Green Diamond, Square, VS-SI

Diamond

0.03ct1 pc
$ 27.95
2 x 2 mm (calibrated)
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1.70ct Natural Medium Red Tourmaline, Round, VVS, Photo A

1.70ct Natural Medium Red Tourmaline, Round, VVS

Tourmaline

1.70ct1 pc
$ 253.98
7 mm (calibrated)
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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

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and functional

Posted By Dessa in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Was a good experience.

Posted By Tim in July, 2025
Source: Bizrate
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