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Home › Calibrated Gemstones › Square Shape 13x13 mm Gems

Calibrated Square Cut Gemstones in Size 13x13 mm

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3.28ctw Natural Sky Blue Topaz, Pear Shape, VS, Photo A

3.28ctw Natural Sky Blue Topaz, Pear Shape, VS

Topaz

3.28ct total6 pcs
$ 25.16
6.2 x 4.3 mm
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171.65ct Natural Pineapple Yellow Quartz, Oval, VVS-VS, Photo A
Quartz Product Video (341772)

171.65ct Natural Pineapple Yellow Quartz, Oval, VVS-VS

Quartz

171.65ct1 pc
$ 393.05
38.4 x 31.8 mm
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1.09ct Natural Multicolor Opal, Oval, Translucent, Photo A

1.09ct Natural Multicolor Opal, Oval, Translucent

Opal

1.09ct1 pc
$ 35.82
10 x 7 mm (calibrated)
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0.77ct Natural Deep Pink Sapphire, Pear Shape, VVS-VS, Photo A

0.77ct Natural Deep Pink Sapphire, Pear Shape, VVS-VS

Sapphire

0.77ct1 pc
$ 253.08
6.6 x 5.2 mm
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0.57ct Natural Lively Green Peridot, Marquise, VVS-VS, Photo A

0.57ct Natural Lively Green Peridot, Marquise, VVS-VS

Peridot

0.57ct1 pc
$ 8.52
8 x 4 mm (calibrated)
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3.56ct Natural Medium Green Prehnite, Oval, Transparent, Photo A

3.56ct Natural Medium Green Prehnite, Oval, Transparent

Prehnite

3.56ct1 pc
$ 10.92
10 x 8 mm (calibrated)
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14.18ctw Natural Golden Orange Citrine, Octagon / Emerald Cut, VVS, Photo A

14.18ctw Natural Golden Orange Citrine, Octagon / Emerald Cut, VVS

Citrine

14.18ct total2 pcs
$ 91.19
14 x 10 mm (calibrated)
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16.45ct Natural Multicolor Rainbow Pyrite, Fancy, Opaque, Photo A

16.45ct Natural Multicolor Rainbow Pyrite, Fancy, Opaque

Rainbow Pyrite

16.45ct1 pc
$ 42.60
27 x 20 mm (calibrated)
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3.23ct Natural Iris Violet Amethyst, Round, VS, Photo A

3.23ct Natural Iris Violet Amethyst, Round, VS

Amethyst

3.23ct1 pc
$ 24.77
10 mm (calibrated)
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2.47ct Natural Light Pink Strawberry Quartz, Oval, Transparent, Photo A

2.47ct Natural Light Pink Strawberry Quartz, Oval, Transparent

Strawberry Quartz

2.47ct1 pc
$ 12.30
9 x 7 mm (calibrated)
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1.58ct Natural Warm White Sillimanite Cat's Eye, Oval, Transparent, Photo A

1.58ct Natural Warm White Sillimanite Cat's Eye, Oval, Transparent

Sillimanite Cat's Eye

1.58ct1 pc
$ 6.29
5.9 x 5.6 mm
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0.92ct Natural Bright Green Peridot, Octagon / Emerald Cut, VS, Photo A

0.92ct Natural Bright Green Peridot, Octagon / Emerald Cut, VS

Peridot

0.92ct1 pc
$ 12.22
7 x 5 mm (calibrated)
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14.33ct Natural Bluish White Rainbow Moonstone, Fancy, Transparent, Photo A
Rainbow Moonstone Product Video (669082)

14.33ct Natural Bluish White Rainbow Moonstone, Fancy, Transparent

Rainbow Moonstone

14.33ct1 pc
$ 256.91
22.6 x 10 mm
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0.21ct Natural Light Lively Green Sapphire, Square, VS, Photo A

0.21ct Natural Light Lively Green Sapphire, Square, VS

Sapphire

0.21ct1 pc
$ 29.28
3 x 3 mm (calibrated)
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0.54ct Natural Bright Red Pyrope Garnet, Heart, VVS-VS, Photo A

0.54ct Natural Bright Red Pyrope Garnet, Heart, VVS-VS

Pyrope Garnet

0.54ct1 pc
$ 13.45
5 x 5 mm (calibrated)
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0.86ctw Natural Gold Citrine, Oval, VVS-VS, Photo A

0.86ctw Natural Gold Citrine, Oval, VVS-VS

Citrine

0.86ct total2 pcs
$ 5.43
6 x 4 mm (calibrated)
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3.03ct Natural Golden Citrine, Oval, VVS-VS, Photo A

3.03ct Natural Golden Citrine, Oval, VVS-VS

Citrine

3.03ct1 pc
$ 21.12
11 x 9 mm (calibrated)
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12.79ct Natural Multicolor Pietersite, Pear Shape, Opaque, Photo A

12.79ct Natural Multicolor Pietersite, Pear Shape, Opaque

Pietersite

12.79ct1 pc
$ 42.46
19 x 19 mm (calibrated)
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1.21ct Natural Multicolor Opal, Oval, Transparent, Photo A

1.21ct Natural Multicolor Opal, Oval, Transparent

Opal

1.21ct1 pc
$ 30.13
9.9 x 7.3 mm
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1.77ctw Natural Medium Green Demantoid Garnet, Oval, VS, Photo A

1.77ctw Natural Medium Green Demantoid Garnet, Oval, VS

Demantoid Garnet

1.77ct total4 pcs
$ 193.92
5 x 4 mm (calibrated)
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2.85ctw Natural Deep Reddish Pink Rubies, Oval, VS-SI, Photo A

2.85ctw Natural Deep Reddish Pink Rubies, Oval, VS-SI

Ruby

2.85ct total2 pcs
$ 85.16
7 x 5 mm (calibrated)
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0.72ct Natural Medium Green Peridot, Marquise, VS, Photo A

0.72ct Natural Medium Green Peridot, Marquise, VS

Peridot

0.72ct1 pc
$ 11.47
8 x 4 mm (calibrated)
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0.64ctw Natural Violet Blue Tanzanite, Pear Shape, VVS-VS, Photo A

0.64ctw Natural Violet Blue Tanzanite, Pear Shape, VVS-VS

Tanzanite

0.64ct total2 pcs
$ 37.61
5.2 x 4.2 mm
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6.28ct Natural Multicolor Cinnabar, Oval, Opaque, Photo A

6.28ct Natural Multicolor Cinnabar, Oval, Opaque

Cinnabar

6.28ct1 pc
$ 7.35
17.5 x 11.6 mm
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21.94ct Natural Purplish Violet Amethyst, Oval, VVS-VS, Photo A

21.94ct Natural Purplish Violet Amethyst, Oval, VVS-VS

Amethyst

21.94ct1 pc
$ 174.81
22.5 x 16.5 mm
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1.75ct Natural Multicolor Black Opal, Oval, Translucent, Photo A

1.75ct Natural Multicolor Black Opal, Oval, Translucent

Black Opal

1.75ct1 pc
$ 43.58
12 x 8 mm (calibrated)
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21.63ctw Natural Black Spinel, Oval, Opaque, Photo A

21.63ctw Natural Black Spinel, Oval, Opaque

Spinel

21.63ct total2 pcs
$ 71.10
16 x 12 mm (calibrated)
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1.50ct Natural Medium Purple Spinel, Cushion, VS, Photo A

1.50ct Natural Medium Purple Spinel, Cushion, VS

Spinel

1.50ct1 pc
$ 138.88
7.1 x 6 mm
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2.64ctw Natural White Zircon, Round, VVS-VS, Photo A

2.64ctw Natural White Zircon, Round, VVS-VS

Zircon

2.64ct total2 pcs
$ 46.86
6.5 mm (calibrated)
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7.74ctw Natural Multicolor Opal, Round, Translucent, Photo A
Opal Product Video (466383)

7.74ctw Natural Multicolor Opal, Round, Translucent

Opal

7.74ct total6 pcs
$ 237.44
8 mm (calibrated)
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3.04ct Natural Medium Gold Citrine, Square, VS, Photo A

3.04ct Natural Medium Gold Citrine, Square, VS

Citrine

3.04ct1 pc
$ 16.65
8.7 x 8.5 mm
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3.49ct Natural Deep Red Almandine Garnet, Octagon / Emerald Cut, VVS, Photo A

3.49ct Natural Deep Red Almandine Garnet, Octagon / Emerald Cut, VVS

Almandine Garnet

3.49ct1 pc
$ 139.60
9.2 x 6.6 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

My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.

Posted By RJ in January, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

I loved the selection of gemstones you have a to z

Posted By James in May, 2026
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Overall Rating -> 9 star ratings

I think therea's no problem

Posted By Napoleon in August, 2025
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Overall Rating -> 10 star ratings

A pleasant experience and many choices to choose from

Posted By Krackenking in November, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.

Posted By Big Ricky in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love how easy the site is to use. Really love that the pictures are of actual product.

Posted By LeAnn in January, 2026
Source: Bizrate
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