Most of the cheap ones are true, because the crystal reserves are huge, and you don't have much money to buy a truck. It's not worth faking for this cheap thing.
Artificial gem-class crystals are much more expensive than those "rock crystals" pulled out by cars as industrial raw materials. People go to the factory door to pull a basket of tens of dollars and a laundry list of hundreds of stones.
Online "Crystal Rock" sells you dozens of dollars, and the profit can be high. You don't need to buy any "artificial crystal" for tens of dollars. It's hard to buy non-rock crystal at this price. On the contrary, those hundreds and thousands are the hardest hit areas of fraud.
Cheap crystals are mostly monochromatic crystals, such as the most common white crystals and amethyst. White crystals are produced in many places in China, and the price is not high. Really tens of dollars can buy genuine products.
Other kinds of crystals with certain quality are mostly produced abroad, such as strawberry crystals from Russia and the United States, amethyst from Uruguay and Brazil, moonstone from Sri Lanka, Green Ghost from Brazil and tourmaline from Russia, all of which are imported from abroad.