Similarity is based on note and accord overlap, not molecular analysis.
Differences come from accords and community votes on longevity and sillage.
The main accords of Belle d Opium are white floral and fruity. It opens with Casablanca Lily and Gardenia, reveals Incense and Fruity Notes at its heart, and dries down to Sandalwood and Patchouli. People reach for it in autumn and winter, mostly in the evening.
How a perfume unfolds →