Geode Gemstones: Buy Natural Gemstone Geodes at GemSelect

On the outside, geodes appear to be nothing but rock, but looking deeper into the interior will reveal amazing growths of crystal formations. Natural gemstone geode crystals are usually composed of quartz or chalcedonic deposits, but various other minerals such as calcite, celestite and dolomite are also commonly found within other varieties of geodes.

Geodes are rock cavities or vugs with internal crystal formations ranging in a variety of interesting colors, including pale lilac to deep reddish purple, pale yellow to smoky yellowish brown, and ranging from transparent to translucent crystals. Agate geodes are often banded exhibiting very interesting patterns. Amethyst and citrine geodes can be small nodules cut in half or pieces of larger geodes sold as crystal clusters. Value per carat in geodes, unlike many gems, usually doesn't rise exponentially with weight as it is readily available in large sizes; but rather, the price depends almost entirely on the crystal growth and of course, color.

Crystal production that develops within a geode depends on several variables including the amount of moisture trapped within the geode, various chemicals and the variety of rich minerals deposited, as well as the amount of pressure applied to the geode. The entire process of geode formation takes millions of years, and not surprisingly, the majority of geode specimens are never completely filled out. Geodes with filled out crystal formations are often referred to as nodules; geode nodules composed of agate are referred to as 'thundereggs'.

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Gemstones A-Z

Buy Geode Gemstones

0.82 ct Oval Cut Peridot, 7.1 x 5.2 mm From China

1.23 carat Pear Shape Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6.9 x 4.8 mm

0.59 ct Orange Sphalerite, 4.8 mm Round Cut From Spain

1.16 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.3 x 5.5 mm

12.47 ct Yellow Quartz, 16.1 x 15.5 mm Carved From Brazil

1.38 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.1 x 6.5 mm

9.08 ct Oval Tiger's Eye, 14 x 10 mm From Thailand

0.2 ct Black Diamond, 3.6 mm Diamond Cut From India

17.07 ct Pencil Cut Jasper, 30.3 x 8.6 mm From India

5 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 8.1 x 7.9 mm

0.17 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.6 mm

2.43 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 8 x 6.1 mm

0.59 ct Loose Orange Sapphire, 6.1 x 3.9 mm Oval Cut From Tanzania

0.68 ct Oval Sillimanite Cat's Eye, 5.9 x 3.9 mm From Madagascar

0.41 ct Loose Yellow Sapphire, 4.3 mm Round Cut From Tanzania

1.45 ct Oval Cut Fire Opal, 8.2 x 6.2 mm From Mexico

8.28 ct Loose Pear Dendritic Agate, 18.3 x 13.1 mm From India

1.66 carat Orange Zircon, Oval loose Zircon from Tanzania, Natural Untreated Gem, 7.9 x 5.9 mm

3.87 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.8 x 4.9 mm

2.28 ct Yellow Sphene, 8.1 x 7.2 mm Oval Cut From Sri Lanka

63.61 ct Yellow Quartz, 30.8 x 23.2 mm Oval Concave Cut From Brazil

5.81 carat Swiss Blue Topaz, Carved Leaf loose Topaz from Brazil, Natural Gem, 13.5 x 9.7 mm

1.57 ct Loose Oval Cut Black Opal, 10.4 x 8.2 mm From Ethiopia

0.29 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.9 mm

3.69 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.9 x 7.9 mm

5.09 ct Brown Moonstone, 9.3 x 9.1 mm Carved From India

28.33 carat Pear Hematite, loose Certified Hematite from Brazil, Natural Untreated Gem, 23.5 x 16.2 mm

1.79 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 7 mm

2.89 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gems, 7 x 4.7 mm

2.33 ct Oval Prehnite, 8.1 x 6.8 mm From South Africa

0.79 ct Oval Sillimanite Cat's Eye, 6.5 x 6.2 mm From Madagascar

17.4 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 21.1 x 16 mm

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