Dalí is in the Details
The Royal Heart's ruby core, much like the human heart, is off center. Just a little bit closer to its left side, frustratingly creating an imbalance in the symmetrical-loving brain. The lopsidedness is a perfect contrast against immaculately-made jewelry like the ones you'd see at Tiffyany's or De Beers. It's the detail like that that makes Dalí incontestably remarkable, because indeed, the human heart's exact location is behind, and slightly leaning towards the left breastbone.
The most important piece in this brooch is not encrusted in jewels and is in fact hidden from plain sight. Equipped with a moving motor mechanism, it looks like its pumping blood to an imaginary body. Its realistic beating and pace is so jarring - it does not make a sound as it beats but the mind compensates and creates a phantom beating sound.
The brooch's outer heart is made up of 18k yellow gold. Diamonds, Pearls, Rubies, Sapphires, Emeralds, Aquamarines, Peridots, Hessonite Garnets, and an Amethyst quartz make up the crown. The ruby heart consists of round and oval cut natural rubies. It is equipped with a synchron motor, which I think is the same ones used in clocks.