From my spiritual guru "Uncle" Art (aka Rabbi Lavender):

What will people think of next! Jewish tradition would be dead-set (sorry, couldn’t resist) against this. For one, Jewish tradition is unanimous that the cadaver should be

1) buried whole and untouched
2) as soon as possible after death, usually the very next day (except for Shabbat and holidays)

I think most of us want to believe that we will somehow live on after death. In Jewish tradition we live on in the memories that people have of us, and the good works we have done while we are alive.

Thinking that one’s remains can be turned into a diamond, which according to DeBeers and Ian Fleming are forever, strikes me as an exercise in vanity. So on behalf of Jewish tradition , I thusly proclaim it to be an act not only of vanity, but futility.