Buy 13 mm Round Calibrated Gemstones from GemSelect

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 Round shapes, facet cut and cabochon gems available now in 13 mm diameter 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 around 0.3 mm or slightly higher even. This small variance can usually be accommodated for 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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Overall Rating -> 10

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Overall Rating -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

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Gemstones A-Z

Buy Round Shape 13 mm Gems

0.91 ct Loose Round Cut Lapis Lazuli, 6 mm From Afghanistan

2.35 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3.1 mm

4.81 ct Oval Cat's Eye Opal, 13 x 8.2 mm From Madagascar

6.36 ct Oval Boulder Opal, 21.5 x 8 mm From Australia

1.8 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.6 x 6.5 mm

6.13 ct Pink Mystic Topaz, 9.9 x 8 mm Oval Concave Cut From Brazil

106.71 carat Multicolor Tourmaline, Carved Leaf loose Tourmaline from Mozambique, Natural Untreated Gem, 56.2 x 37.7 mm

16.09 ct Odd Shaped Druzy Variscite, 32.5 x 21.4 mm From Argentina

17.67 ct Yellow Quartz, 23.2 x 17.1 mm Carved From Brazil

11.91 ct Carved Prehnite, 16.8 x 10.9 mm From South Africa

8.86 ct Octagon Cut Smoky Quartz, 12.4 x 12.4 mm From Brazil

4.7 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 7.5 mm

2.66 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4 x 4 mm

0.93 ct Marquise Cut Color-Change Diaspore, 10.8 x 4.7 mm From Turkey

40.86 ct Fancy Jasper, 41 x 28.4 mm From Indonesia

3.37 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 5.9 x 4.1 mm

4.66 ct Yellow Quartz, 11.5 x 11.4 mm Carved From Brazil

18.62 ct Oval Rose Quartz, 17.3 x 15.1 mm From South Africa

2.85 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 10 mm

74.15 ct Drilled Sphere Rhodochrosite, 15.8 mm From South Africa

22.55 ct White Jadeite, 19 x 17 mm Oval Cut From Myanmar

6.3 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 9.2 x 9.1 mm

2.35 ct Loose Orange Moonstone, 9.1 x 7 mm Cushion Cut From India

0.77 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 6 x 4.4 mm

25.14 ct Loose Green Amazonite, 36.8 x 9.4 mm Pencil Cut From Madagascar

1.26 ct Oval Sillimanite Cat's Eye, 7.5 x 4.9 mm From Madagascar

40.32 ct Blue Sodalite, 33.3 x 25.8 mm Odd Shaped From Australia

1.29 ct Oval Sillimanite Cat's Eye, 7.4 x 5 mm From Madagascar

0.57 carat Orange Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gem, 8.1 x 4.2 mm

19.34 ct Marquise Hematite, 25.4 x 12.2 mm From Brazil

4.74 ct Cushion Onyx, 11 x 10.9 mm From Sri Lanka

2.84 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 9.9 mm

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