La Reine Margot was composed by perfumer Nicolas de Barry, who is the one already created George Sand, in collaboration this time with historian Jeanine Garrison, a specialist of the 16th century. Garrison immersed herself into the National Archives and accounting records of the house of the Queen of Navarre to find out that three perfume materials were repeatedly ordered: amber, musk, and jasmine.
Nicolas de Barry took these three ingredients and blended them using 16th century perfumery techniques which gives the result of a raw perfume that does not offer the olfactory pyramid structure inaugurated much later at the end of the 19th century. La Reine Margot is described as smelling "strong, robust, and carnal"
A 70 ml flacon retails for 72 €. The Maître Gantier et Parfumeur site does not seem to feature the perfume online but you might be able to purchase it directly from the Château de Frileuse, Nicolas de Barry's fiefdom as this option is available for George Sand.
(Sources: Le Figaro, First Luxe)