What it is: A refill of the weightless fluid serum for more diamond-brilliant skin, that fits in your existing Brilliance Serum glass bottle. What it does: The serum helps give you more flawless, radiant, unforgettable skin. Like a diamond, your skin's unique beauty arises from a stunning surface. The serum is powered by Estée Lauder's black diamond truffle extract and SIRTIVITY-LP technology. The serum helps fortify skin for a firmer feel and a visibly more perfected surface. The transcendently