Amethyst – $10-$100/Kg

Among gemstones, amethyst used to be a rare and unique commodity. That is until large deposits of this quartz were found in places such as Brazil, which decreased the value quite a bit.

Still, that doesn’t mean this particular stone doesn’t compete when it comes to price. Depending on the quality grade a particular crystal possesses, bids can come in anywhere from ten bucks to one hundred dollars per kilogram. So if you’re looking into this, we’d suggest procuring a darker amethyst, as it is the most valuable incarnation of this mineral.