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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (196): Geode Gems Agate Geode, Amethyst Geode, Citrine Geode Clear All
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ID: 4470012 pcs
thumb image of 39.6ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 447001)
39.64 ct Agate Geode
23.7 x 18 mm
$ 99.10
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ID: 4700741 pcs
thumb image of 49.3ct Fancy Crystal Cluster Yellow Golden Citrine Geode (ID: 470074)
49.25 ct Citrine Geode
27.6 x 25.7 mm
$ 49.33
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ID: 3917601 pcs
thumb image of 57.7ct Fancy Crystal Cluster Yellow Golden Citrine Geode (ID: 391760)
57.68 ct Citrine Geode
35.5 x 18.8 mm
$ 57.68
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ID: 3917561 pcs
thumb image of 40.2ct Fancy Crystal Cluster Yellow Golden Citrine Geode (ID: 391756)
40.22 ct Citrine Geode
33.6 x 24.1 mm
$ 40.22
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ID: 3917311 pcs
thumb image of 60.1ct Fancy Crystal Cluster Brownish Golden Citrine Geode (ID: 391731)
60.07 ct Citrine Geode
31.6 x 23.4 mm
$ 60.07
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ID: 4503652 pcs
thumb image of 37.9ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 450365)
37.89 ct Agate Geode
23.6 x 16.2 mm
$ 94.35
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ID: 4548612 pcs
thumb image of 13.6ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 454861)
13.60 ct Agate Geode
15.9 x 12.9 mm
$ 27.20
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ID: 4547662 pcs
thumb image of 14.2ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 454766)
14.24 ct Agate Geode
18.1 x 16.4 mm
$ 28.48
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ID: 4469642 pcs
thumb image of 31.9ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 446964)
31.86 ct Agate Geode
23.1 x 17.9 mm
$ 79.65
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ID: 4548532 pcs
thumb image of 6ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 454853)
5.98 ct Agate Geode
14.1 x 11.2 mm
$ 11.96
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ID: 4556592 pcs
thumb image of 38.8ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 455659)
38.80 ct Agate Geode
24.4 x 17.3 mm
$ 77.60
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ID: 4469962 pcs
thumb image of 43.3ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 446996)
43.28 ct Agate Geode
30.1 x 20.7 mm
$ 29.20
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ID: 4558262 pcs
thumb image of 14.4ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 455826)
14.44 ct Agate Geode
18.4 x 12.4 mm
$ 28.88
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ID: 4469612 pcs
thumb image of 30.5ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 446961)
30.45 ct Agate Geode
19.3 x 19.5 mm
$ 30.45
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ID: 4552962 pcs
thumb image of 11ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 455296)
11.00 ct Agate Geode
17.1 x 16.4 mm
$ 22.00
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ID: 4553062 pcs
thumb image of 15.6ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 455306)
15.58 ct Agate Geode
16.6 x 16.3 mm
$ 31.16
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ID: 4552982 pcs
thumb image of 16.1ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 455298)
16.07 ct Agate Geode
21.8 x 19.3 mm
$ 32.14
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ID: 4548592 pcs
thumb image of 12.2ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 454859)
12.23 ct Agate Geode
20.3 x 13 mm
$ 24.46
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ID: 4556552 pcs
thumb image of 35.7ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 455655)
35.74 ct Agate Geode
23.7 x 20.2 mm
$ 71.48
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ID: 3918161 pcs
thumb image of 67.7ct Fancy Crystal Cluster Violet Amethyst Geode (ID: 391816)
67.71 ct Amethyst Geode
34.2 x 25.2 mm
$ 67.71
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ID: 4546442 pcs
thumb image of 16.6ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 454644)
16.64 ct Agate Geode
22.4 x 13.3 mm
$ 33.28
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Geode Gems
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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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart