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

1.53 ct Square Tiger's Eye, 5.9 x 5.9 mm From Thailand

5.68 ct Odd Shaped Hemimorphite Druzy, 13.3 x 9.1 mm From Congo

1.41 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gems, 6.2 x 5.2 mm

1.8 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 7.1 mm

5.53 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 12.1 x 9.9 mm

0.51 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 5.9 x 4.7 mm

1.08 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 4.2 x 3.3 mm

85.53 ct Oval Ruby-Zoisite, 38.2 x 30.3 mm From Tanzania

2.2 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 9.3 x 9.4 mm

0.86 carat Pink Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 8.9 x 5.2 mm

7.26 ct Yellow Apatite, 11.9 x 10.4 mm Cushion Cut From Madagascar

3.36 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gems, 7.7 x 5 mm

6.62 ct Baguette Tiger's Eye, 12.3 x 10.2 mm From Thailand

33.84 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 22.5 x 18.4 mm

2.28 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.2 mm

3.69 ct Fancy Fire Agate, 11.8 x 8.9 mm From Mexico

2.78 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.2 x 9.2 mm

0.76 carat Oval Emerald, loose Certified Emerald from Zambia, Natural Gem, 6.9 x 5.1 mm

0.8 ct Oval Cut Peridot, 6.9 x 5 mm From China

0.85 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 5 mm

3.43 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 15.1 x 6.7 mm

0.07 ct Green Diamond, 2.7 mm Diamond Cut From India

1.55 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gems, 6.3 x 6.2 mm

10.6 ct Purple Kunzite, 15.5 x 9.6 mm Cushion Cut From Afghanistan

10.85 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 16.9 x 10.2 mm

7.58 carat Bi-color Ametrine, Emerald-Cut loose Ametrine from Brazil, Natural Untreated Gem, 11.6 x 11 mm

2.7 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.9 x 8.7 mm

8.26 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16.8 x 12.6 mm

1.43 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 10.9 x 8.2 mm

1.31 ct Loose Yellow Sapphire, 6 x 4.9 mm Oval Cut From Tanzania

5.27 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 13.9 x 9.9 mm

2.63 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 10.6 x 8.1 mm

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