We have three amethyst tumblestones which arrived in the same mixed bag of tumblestones which we recently bought in an online auction. These three tumblestones have white quartz veins here and there, but are otherwise all natural amethyst. From a crystal healer's perspective it is probably nice to have that extra quartz in there since quartz acts as your empowering stone for everything else. These are like... super amethysts.

But on the non-joking side, these are very pretty amethyst tumbled stones which we bought secondhand and will therefore not overcharge you for. Buy your crystals secondhand. You do us a favour, the world a favour, and the rocks a favour.