Ametrine is a natural stone with the colors of purple and yellow or yellow and purple. These stones came from Bolivia or I was told this when I bought them. The stones are large (some over an inch or 23mm.) and the weight of the stones range from3 grams to 20 grams (100ct.).Mostly clean stones to facet, cab, or your jewelry needs!!Selling 300cts (60 grams) for $16.00 and you will receive 4-10 stones for your lapidary pleasures!Thank you for visiting Antique Rocks and Gems and please view my other jewelry and stone rough that are up for sale presently.