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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Gem Select has a great selection of products and it is very easy to navigate the website and find what you are looking for.
Gemselect had such a fantastic selection of all gems I could want, in pairs, lots, or singles, and if I wanted some gems to be just 1/10th of a millimeter bigger or smaller, they had that variance also, which is massively helpful for the specific pieces I make with their gems. I could even select different qualities of clarity and tone, which really helps my projects a lot too. I never regret a purchase made from gemselect, they help me run my custom jewelry business better with their products.
I was looking to get some stones to help turn into a necklace for my daughter, but other sites didn't have exactly what I wanted, I found it on GemSelect though, and I think it will turn out really really well!
Once again, the picture of the gem shown did not match the stone I received. I believe they are the same stones, but the pics shown were enhanced some way to show the beauty and coloration of the stone. I could NOT see the coloration. I should have realized that would happen.