Amethyst can fade if left in the sun or if they are exposed to heat. Exposure to heat may also create prasiolite, a crystal that is also known as green amethyst, green quartz, vermarine ...

"I was told this was a green amethyst, and haggled to $42," the Reddit user said. However, once she examined the item further at home she decided to have it checked out by a professional.

But it's not just the colour of the quartz, rather what the stone signifies. Green amethyst, also known as prasiolite, is said to symbolise compassion, abundance, self-reliance and prosperity.