Green aventurine cabochons, size 38mm, are rare and we are pleased to offer this new cabochon size by Gary Olson, (Photo by Ilene Olson). Green aventurine rough is from India and the beautiful grass green or jade color with lots of mica flakes make a beautiful cabochon. The translucentcy of green aventurine is ideal for wire wrapping and showing the unique cab coloring. A 38mm size is also called the dollar size for being the same size as the old silver dollar coins.