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

28.67 ct Pencil Cut Jasper, 33.8 mm From India

1.93 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.2 x 5.2 mm

1.02 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 7 mm

1.95 ct Cushion Cut Peridot, 8 x 7.4 mm From Myanmar

0.92 ct Oval Cut Fire Opal, 8.2 x 6.3 mm From Mexico

13.59 ct Oval Boulder Opal, 20.2 x 14.7 mm From Australia

5.11 ct Blue Star Sapphire, 7 x 5.2 mm Oval Cut From Thailand

12.73 ct Amethyst Geode Slice, 17.4 x 17.1 mm From Brazil

3.19 ct Round Prehnite, 6.7 mm From South Africa

0.14 ct Square Cut Iolite, 3 x 3 mm From Madagascar

1.17 carat Pear Shape Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 8.5 x 5.3 mm

6.52 ct Amethyst Geode Slice, 15.3 x 12.5 mm From Brazil

10.33 ct Oval Quartz With Marcasite, 17.4 x 12.6 mm From Brazil

0.9 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.5 mm

1.58 carat Orange Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 6.5 mm

1.62 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.2 x 6.9 mm

1.48 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9.7 x 7.1 mm

1.9 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.2 x 3.6 mm

14.28 ct Drilled Sphere Rutile Quartz, 10.1 mm From India

5.05 ct Oval Fire Agate, 13.9 x 9.4 mm From Mexico

1.31 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gems, 5.9 x 4.3 mm

0.76 ct Yellow Beryl, 7.1 x 6.6 mm Trillion Cut From Madagascar

7.22 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12.8 mm

0.89 ct Loose Round Cut Lapis Lazuli, 6.1 mm From Afghanistan

8.3 ct Oval Star Ruby, 13.3 x 10.9 mm From Madagascar

8.24 carat Pear Boulder Opal, loose Certified Boulder Opal from Australia, Natural Untreated Gem, 19.4 x 9.3 mm

6.38 ct Oval Tiger's Eye, 10.2 x 8 mm From Thailand

94.23 carat Pear Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gem, 43.3 x 32.9 mm

0.5 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 6 x 4.1 mm

0.98 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.2 x 6 mm

0.56 ct Orange Sphalerite, 5.2 x 4.4 mm Oval Cut From Spain

7.16 ct Oval Star Moonstone, 13.9 x 10.2 mm From India

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