L' Instant De Guerlain Perfume for Women by Guerlain. Launched by the design house of Guerlain in 2003, L INSTANT DE GUERLAIN is a perfume that blends with the skin and light and wakes the senses and emotions to a moment of intense sensuality. The Citrus Honey and Magnolia notes are complemented by the Amber for a fragrance designed for a modern, active woman.