Check out this amazing Glass Gem Corn from Seed Trust. According to the site:
Seedsman Greg Schoen got the seed from Carl Barnes, a part-Cherokee man, now in his 80’s, in Oklahoma. He was Greg’s “corn-teacher”. Greg was in the process of moving last year and wanted someone else to store and protect some of his seeds. He left samples of several corn varieties, including glass gem. I grew out a small handful this past summer just to see. The rest, as they say is history. I got so excited, I posted a picture on Facebook. We have never seen anything like this. Unfortunately, we did not grow out enough to sell.