Everywhere you turn in India's ancient temple town Madurai, the heady and fragrant smell of jasmine fills the air, a reminder of its symbolism of love in Hinduism. But the delicate white flower, renowned for its longevity and fragrance in Madurai, also plays another role thousands of miles away -- it is an essential ingredient in some of the world’s most recognisable perfumes, including J'adore by Dior and Mon Guerlain by Guerlain.