The Empress of Uruguay, an ancient amethyst geode from Uruguay, sold for $1.2 million in 2016. Weighing over 2.5 tons, it's over 130 million years old.
Brazil's Crystal Palace Geode, an enormous amethyst geode weighing over 2.5 tons, fetched $900,000 in 2008.
The Aladdin’s Cave Geode, a substantial amethyst geode from Brazil, weighing over 2 tons, was sold for $350,000 in 2009.
The Empress of Uruguay II, a smaller amethyst geode from Uruguay, went for $150,000 in 2019.
Spain's Crystal Cavern Geode, housing massive quartz crystals, was sold for $70,000 in 2009
The Cacoxenite Geode, an amethyst geode from Brazil containing rare cacoxenite inclusions, fetched $100,000 in 2015