I did a search on the Yahoo Group and it seems he had designed Robusto Brilliant for dark garnets and he had put a copy in his folder on the group. Upon looking through the files, it seems Jim removed his folder from the group.
He has an ebook on CD that is called The Garnet Study that you might want to look into. Here’s his website: http://www.northcoastlapidary.com/?p=752
Good luck!
Robin