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

10.08 ct Yellow Quartz, 15.1 mm Round Concave Cut From Brazil

1.08 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 7 x 5.1 mm

12.2 ct Oval Bloodstone, 15.3 x 12.4 mm From Madagascar

8.89 ct Oval Ruby-Zoisite, 13.9 x 10.3 mm From Tanzania

0.87 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 11.9 x 3.9 mm

16.93 carat Carved Rose Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 17.3 x 16.5 mm

3.55 ct Loose Oval Malachite, 10 x 7.4 mm From Congo

0.67 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.1 mm

2.06 ct Oval Concave Cut Smoky Quartz, 14.2 x 6.8 mm From Brazil

3.11 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gem, 9.1 x 9 mm

0.84 carat Round Grossularite Garnet, loose Certified Grossularite Garnet from Tanzania, Natural Untreated Gem, 5.3 mm

0.22 carat Round Cabochon Emerald, loose Certified Emerald from Colombia, Natural Gem, 4.1 mm

1.01 ct Yellow Beryl, 8 x 5.8 mm Oval Cut From Madagascar

0.85 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Gem, 8 x 5.1 mm

1.28 ct Loose Purple Sapphire, 6.9 x 5.7 mm Cushion Cut From Tanzania

0.33 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.7 mm

2 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gems, 5.2 x 4.2 mm

19.21 carat Sky Blue Topaz, Carved Leaf loose Topaz from Brazil, Natural Gem, 23.8 x 14 mm

11.85 carat Drilled-Ball Tiger's Eye, loose Certified Tiger's Eye from India, Natural Untreated Gem, 12.1 mm

5.81 ct White Quartz, 11.7 mm Diamond Cut From Brazil

4.63 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.3 x 10 mm

1.62 ct Oval Cut Fire Opal, 9 x 7.4 mm From Mexico

2.68 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 9.3 x 7.6 mm

2.36 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

8.99 ct Round Cut Smoky Quartz, 13.6 mm From Brazil

7.73 ct Oval Rainbow Moonstone, 19.1 x 10.4 mm From the United States

2.66 ct Loose Orange Moonstone, 9.2 x 7.2 mm Cushion Cut From India

4.27 ct Yellow Quartz, 12.1 x 9.8 mm Oval Diamond Cut From Brazil

1.56 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

12.11 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10 x 8.2 mm

6.84 carat Yellow Citrine, Emerald Cut loose Citrine from Bolivia, Natural Untreated Gem, 13.8 x 10 mm

9.11 carat Carved Rose Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.1 x 13.9 mm

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