Corpse Diamonds

Death is Forever. Be Remembered. Corpse Diamonds.

Earliest known advertisement for Corpse Diamonds.

Corpse Diamonds is a low-end corpse-to-diamond service provider.

Advertising campaigns

Are you Corpse Diamond material?

Seeking corpses for high-end Memorial Diamond market.

Carbon-based only need apply.

Beware! Some "memorial diamond" services add "lab carbon", with the resulting diamond containing as little as 3% of your carbon.

Diamonds Only Live Forever is a spy film starring Charles Gray as two enemy agents locked in a deadly game of wits.
Time Enough in Layers: A geologist (Meredith Burgess-Shale) unleashes a global nuclear holocaust in order to find a rare trilobite. (The Twilight Zone: Forbidden Episodes)
Am I Late? is a novel about death by Death.

Memorial diamond @ Wikipedia - lab-grown diamonds that are promoted as being produced from carbon extracted from human or pet animal hair or cremated remains, cremation diamonds, that are provided to the producer by the customer.