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1.09 carat Marquise Cut Opal, loose Certified Opal from Australia, Natural Untreated Gem, 13.8 x 5.6 mm, Photo A

1.09 carat Marquise Cut Opal, loose Certified Opal from Australia, Natural Untreated Gem, 13.8 x 5.6 mm

Opal

1.09ct1 pc
$ 49.05
13.8 x 5.6 mm
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5.86 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10.2 x 8.1 mm, Photo A

5.86 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10.2 x 8.1 mm

Citrine

5.86ct total2 pcs
$ 32.23
10.2 x 8.1 mm
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5.95 ct Rainbow Pyrite, 17.3 x 12.4 mm From Russia, Photo A

5.95 ct Rainbow Pyrite, 17.3 x 12.4 mm From Russia

Rainbow Pyrite

5.95ct1 pc
$ 21.00
17.3 x 12.4 mm
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2.78 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 10 x 5.1 mm, Photo A

2.78 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 10 x 5.1 mm

Topaz

2.78ct total2 pcs
$ 15.29
10 x 5.1 mm
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29.01 ct Oval Jasper, 32.1 x 12.8 mm From Indonesia, Photo A

29.01 ct Oval Jasper, 32.1 x 12.8 mm From Indonesia

Jasper

29.01ct total2 pcs
$ 47.87
32.1 x 12.8 mm
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3.21 ct Oval Prehnite, 9 x 7.7 mm From South Africa, Photo A

3.21 ct Oval Prehnite, 9 x 7.7 mm From South Africa

Prehnite

3.21ct1 pc
$ 7.06
9 x 7.7 mm
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1.75 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.3 x 3.6 mm, Photo A

1.75 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.3 x 3.6 mm

Tourmaline

1.75ct1 pc
$ 33.78
17.3 x 3.6 mm
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2.37 ct Oval Cut Strawberry Quartz, 8.2 x 6.1 mm From Russia, Photo A

2.37 ct Oval Cut Strawberry Quartz, 8.2 x 6.1 mm From Russia

Strawberry Quartz

2.37ct total2 pcs
$ 14.73
8.2 x 6.1 mm
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0.81 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 10.8 x 4.1 mm, Photo A

0.81 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 10.8 x 4.1 mm

Color-Change Diaspore

0.81ct1 pc
$ 28.51
10.8 x 4.1 mm
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7.93 carat Brown Zircon, Oval loose Zircon from Sri Lanka, Natural Untreated Gems, 6 x 4.2 mm, Photo A
Click for Product Video (337662)

7.93 carat Brown Zircon, Oval loose Zircon from Sri Lanka, Natural Untreated Gems, 6 x 4.2 mm

Zircon

7.93ct total10 pcs
$ 61.06
6 x 4.2 mm
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19.43 ct Baguette Maw-Sit-Sit, 15.8 x 13.2 mm From Myanmar, Photo A

19.43 ct Baguette Maw-Sit-Sit, 15.8 x 13.2 mm From Myanmar

Maw-Sit-Sit

19.43ct1 pc
$ 64.12
15.8 x 13.2 mm
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3.62 carat White Topaz, Round loose Topaz from Brazil, Natural Untreated Gem, 9.2 mm, Photo A
Click for Product Video (557820)

3.62 carat White Topaz, Round loose Topaz from Brazil, Natural Untreated Gem, 9.2 mm

Topaz

3.62ct1 pc
$ 31.98
9.2 mm
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1.49 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 4.6 x 3.8 mm, Photo A

1.49 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 4.6 x 3.8 mm

Demantoid Garnet

1.49ct total4 pcs
$ 163.90
4.6 x 3.8 mm
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5.62 ct Loose Oval Agate, 12.4 x 11.3 mm From Indonesia, Photo A

5.62 ct Loose Oval Agate, 12.4 x 11.3 mm From Indonesia

Agate

5.62ct1 pc
$ 9.55
12.4 x 11.3 mm
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2.88 ct Black Star Sapphire, 9 x 6.6 mm Oval Cut From Thailand, Photo A

2.88 ct Black Star Sapphire, 9 x 6.6 mm Oval Cut From Thailand

Star Sapphire

2.88ct1 pc
$ 51.84
9 x 6.6 mm
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29.74 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 17.7 x 16.3 mm, Photo A
Click for Product Video (669719)

29.74 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 17.7 x 16.3 mm

Ruby

29.74ct1 pc
$ 989.75
17.7 x 16.3 mm
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0.72 ct Loose Yellow Sapphire, 6.8 x 4.3 mm Oval Cut From Madagascar, Photo A

0.72 ct Loose Yellow Sapphire, 6.8 x 4.3 mm Oval Cut From Madagascar

Sapphire

0.72ct1 pc
$ 43.56
6.8 x 4.3 mm
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16.45 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16.2 x 16.1 mm, Photo A

16.45 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16.2 x 16.1 mm

Amethyst

16.45ct1 pc
$ 115.15
16.2 x 16.1 mm
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10.32 ct Oval Coral, 21.9 x 15.6 mm From Indonesia, Photo A

10.32 ct Oval Coral, 21.9 x 15.6 mm From Indonesia

Coral

10.32ct1 pc
$ 22.70
21.9 x 15.6 mm
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1.42 carat Emerald-Cut Iolite, loose Certified Iolite from Madagascar, Natural Untreated Gem, 7.9 x 5.9 mm, Photo A

1.42 carat Emerald-Cut Iolite, loose Certified Iolite from Madagascar, Natural Untreated Gem, 7.9 x 5.9 mm

Iolite

1.42ct1 pc
$ 113.60
7.9 x 5.9 mm
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0.72 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 4.9 mm, Photo A

0.72 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 4.9 mm

Peridot

0.72ct1 pc
$ 5.04
7 x 4.9 mm
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2.01 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.5 x 6.9 mm, Photo A

2.01 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.5 x 6.9 mm

Hessonite Garnet

2.01ct1 pc
$ 31.53
8.5 x 6.9 mm
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2.43 ct Loose Oval Cut Black Opal, 12.6 x 8.9 mm From Ethiopia, Photo A

2.43 ct Loose Oval Cut Black Opal, 12.6 x 8.9 mm From Ethiopia

Black Opal

2.43ct1 pc
$ 60.75
12.6 x 8.9 mm
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1.19 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.9 x 5.6 mm, Photo A

1.19 carat Green Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.9 x 5.6 mm

Tourmaline

1.19ct1 pc
$ 59.50
7.9 x 5.6 mm
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1.15 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 10.6 x 5.5 mm, Photo A

1.15 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 10.6 x 5.5 mm

Color-Change Diaspore

1.15ct1 pc
$ 61.53
10.6 x 5.5 mm
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0.1 ct Black Diamond, 2.1 mm Diamond Cut From India, Photo A

0.1 ct Black Diamond, 2.1 mm Diamond Cut From India

Diamond

0.10ct total2 pcs
$ 29.17
2.1 mm
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1.24 ct Oval Cut Kornerupine, 8.2 x 5.4 mm From Sri Lanka, Photo A

1.24 ct Oval Cut Kornerupine, 8.2 x 5.4 mm From Sri Lanka

Kornerupine

1.24ct1 pc
$ 68.20
8.2 x 5.4 mm
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1.05 ct Loose Yellow Sapphire, 5.5 mm Round Cut From Tanzania, Photo A
Click for Product Video (512131)

1.05 ct Loose Yellow Sapphire, 5.5 mm Round Cut From Tanzania

Sapphire

1.05ct1 pc
$ 207.90
5.5 mm
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2.82 carat Princess-Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9 x 8.9 mm, Photo A

2.82 carat Princess-Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9 x 8.9 mm

Amethyst

2.82ct1 pc
$ 22.56
9 x 8.9 mm
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1.43 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 5 mm, Photo A
Click for Product Video (609063)

1.43 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 5 mm

Zircon

1.43ct total2 pcs
$ 37.75
5 mm
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18.09 ct Square Jasper, 18.6 x 16.6 mm From Indonesia, Photo A

18.09 ct Square Jasper, 18.6 x 16.6 mm From Indonesia

Jasper

18.09ct1 pc
$ 11.34
18.6 x 16.6 mm
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1.28 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 7.2 x 5.1 mm, Photo A
Click for Product Video (569901)

1.28 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 7.2 x 5.1 mm

Ruby

1.28ct1 pc
$ 943.39
7.2 x 5.1 mm
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Photos are of Actual Products for Sale

Cassiterite is a tin oxide mineral, and is the primary ore for tin. In addition to its important industrial use, it has some interesting properties that make high quality crystals valuable as gemstones. Cassiterite is reasonably hard, with a rating on the Mohs scale of 6 to 7. It tends to be opaque though thin crystals can be translucent. Its chief virtue is its multiple crystal faces and outstanding luster. Many specimens are graded as having "adamantine" (diamond-like) or submetallic luster.

Cassiterite is one of the densest gem materials known. It also has a very high refractive index, higher than zircon, sphene and demantoid garnet.

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