What are the typical prices for amethyst stones?

Prices for amethyst stones vary based on depth of color and carat weight. Lighter stones, such as light green or very light purple are valued at approximately $10 to $14 per carat, while violet or reddish purple cost approximately $40 to $65 per carat.

Though the main factor in deciding value of an amethyst stone is its color, a stone's value may also increase or decrease because of its size, clarity and cut. Larger amethyst stones are more expensive than small ones, and stones with a higher clarity rating, or grade for how clear the stone is, are worth more than those with slight blemishes.