NEW ULTIMATE DIAMOND BRILLIANCE SERUM Diamond-brilliant skin: More flawless. Radiant. Unforgettable. Re-Nutriv Re-Nutriv Repair Serum RARE & PRECIOUS BLACK DIAMOND TRUFFLE EXTRACT From the best, "Extra Class" truffles, which are graded much like diamonds, we create an exclusive extract to improve* skin's visible energy and vitality. *In vitro testing.