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Don't know what you mean by entangled. They mention forming diamonds using the heat and pressure of the press, which is a well known technique to alter the crystal lattice between carbon atoms.

Does it take more energy than mining for diamonds?

> Quantum Entanglement Links 2 Diamonds: Usually a finicky phenomenon limited to tiny, ultracold objects, entanglement has now been achieved for macroscopic diamonds at room temperature (2011) https://www.scientificamerican.com/article/room-temperature-...

It takes less human suffering.

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