Designed as the more intensive counterpart to the original Y Theorem Serum, the Celestial Black Diamond serum from 111SKIN is here to help with signs of ageing and skin pigmentation. Infused with liquorice root, quebracho wood and hyaluronic acid, the lightweight formula helps to improve firmness and elasticity by encouraging production in the skin and delivering a hefty dose of hydration in the process.| '111SKIN Celestial Black Diamond serumApplication: Apply one pump morning and evening, on clean, dry skin. Follow with moisturiser30mlFor hygiene reasons, this product cannot be exchanged or refunded, unless faulty.'