Answers:
amethyst is a beautiful, yet inexpensive gemstone. fifteen together totalling to 13 carats would mean that most of them are less than a carat each or close thereabout. You didn't specify what shape they are which can affect the price too. Even with that in consideration, you should expect to pay no more than about 350-400 dollars for the lot or higher for specialty cuts. Unpolished or less than gem quality would be much cheaper.
This article contents is post by this website user, EduQnA.com doesn't promise its accuracy.
More Questions & Answers...