While this may not appeal to everyone, I think it may be the ultimate way to recycle. A company called LifeGem will create a diamond from the carbon captured during the cremation of human remains. Carbon released during cremation is heated to produce graphite which is sent to a lab where it is synthesized into a diamond, or diamonds. A colorless diamond would cost between $3,400 and $7,000.
Although, I didn't bring this up at the family Thanksgiving gathering, this appeals to me more than being a reef ball or being blasted into space orbit.
I think a Reef Ball is more environmentally positive because it creates habitat for life. Becoming a fake diamond...especially with all the human suffering involved in conflict diamonds and the De Beers monopoly may not be as positive.