Estee Lauder's Re-nutriv Ultimate Diamond Transformative Brilliance Serum Refill fights signs of aging by fortifying the skin and increasing elasticity. The exclusive Black Diamond Truffle Extractu2014made from whole truffles harvested by a master grower in Southwest Franceu2014stimulates the skin's natural energy to improve vitality and firmness.Tested by dermatologists, this serum evens skin tones and reduces dark spots without causing breakouts. This refill fits into existing Brilliance Serum bottles.