Because amethyst is relatively inexpensive, it is especially advisable to purchase a stone of gem quality.

When Amethyst is set in jewelry with other gemstones a slightly light color is acceptable, but it may tend to look plain. The overall balance between design and workmanship becomes an important consideration. Overly dark stones with a tone greater than 7 tend to appear black under dim or evening lightning, and should be avoided.

The value of a three-carat-size amethyst of jewelry quality is approximately US $160 for the stone alone (1998).