I then posted a discussion about the necromantic implications thereof.
In the intervening years, it seems that multiple companies have cropped up to perform the same service -- for pets.
As far as I can tell, while there are several Dead Puppy Jewelers out there, the original company doesn't yet have any competition for Soylent Gems. I suspect that most jurisdictions have substantially more rigorous (and more expensive) licensing regulations for disposing of human remains than for animal remains.
Edit: It seems that LifeGems® will now make a diamond from a lock of hair, as well, so you don't have to wait until the actual cessation of biological activity to have your Permanent Necromantic Conduit. They're making gems from the hair of Ludwig von Beethoven and from the charred hair recovered from Michael Jackson's ill-fated Pepsi commercial.
Think about that last. I mean, that's not just crystallizing the remains of an individual who was the focus of a lot of psychic energy, positive and negative, over the years; it's crystallizing the remains of one of the most painful moments of terror in his life. I've got the perfect setting for that gemstone.
I've made similar gems an integral part of the magic system in my Magnum Opus Fantasy Epic, which I really need to sit down and start writing.
For the record, if I'm ever in a situation where I have a limb amputated or an organ removed, I am TOTALLY gonna have it turned into a diamond.