The Diamond Of My Eye, Nose, Left Nipple…

DiamondLifeGem:

The LifeGem is a certified, high quality diamond created from the carbon of your loved one as a memorial to their unique and wonderful life.

I added the emphasis. Part of their process:

We have discovered how to capture the carbon by extracting it from existing cremated remains. This step takes place at one of our many certified locations across the country.
Once captured, this carbon is heated to extremely high temperatures under special conditions. During this phase, the carbon in the ashes coalesces with the natural carbon used in the diamond growth process, allowing the carbon from the deceased to be removed intact from the provided ash remains. While removing the existing ash, this process converts the carbon to graphite with unique characteristics and elements that will create a one-of-a-kind LifeGem diamond like no other in this world.

The cheapest: .20 to .29 carats for $2,499.