Hydrolyzed Pearl
Pearl has been used in East Asian skincare for over a thousand years. That's not a marketing origin story, it's just a long time for something to stick around, and ingredients don't survive that long in beauty traditions without doing something worth noticing.
The modern version is hydrolyzed pearl, which means the pearl has been broken down small enough for the skin to actually use. What's left is a concentrated mix of amino acids, minerals, and trace elements that work on the skin's luminosity from the inside out rather than just reflecting light off the surface. Cellular renewal picks up. Free radicals that cloud and dull the complexion get neutralized. Tone starts to even out in a way that reads as genuinely healthy rather than treated.
It's an ingredient that bridges a long tradition and a very specific function.