I found a yellow/greenish stone in my Mothers jewelry. Knowing her birthstone was Periodot, I assumed that is what the stone was. I wanted to 'build' a ring round this stone. So I took the stone to a local jeweler and much to my disappointment, he told me that the stone was indeed a Spinel. The stone - after I decided to have the ring made anyway - actually turned darker green once the emeralds were set. So I am pleased with the ring and I am guessing I have a rare 2 carat yellow Spinel. I have photos if anyone is interested. If you would like to see, let me know how to post.......I am new at this........lol.