A Tool Born from Chemistry, Not Marketing
Before it became an infographic on a brand’s website, the fragrance pyramid was a concept rooted in the chemistry of aromatic materials. It rests on a simple principle: not all aromatic molecules evaporate at the same speed. Some are extremely volatile — they register immediately and disappear within minutes. Others are molecularly heavier, evaporating slowly and persisting on skin for hours. The pyramid is the mapping of this evaporation over time.
It is classically divided into three levels.
Top Notes
These are the first impressions — what greets the nose in the five to fifteen minutes following application. Top notes are almost always composed of light, highly volatile molecules: citrus fruits (bergamot, lemon, grapefruit*), fresh herbs (*basil, mint), sparkling aldehydes. Their role is to create an enticing opening, an olfactory first handshake.
The paradox of top notes is that they are often the least representative of what you will actually wear. What you smell in the first moments at a counter is not what those around you will perceive four hours later.
Heart Notes
These emerge between fifteen minutes and two to three hours after application, once the top notes have dissipated. The heart is the true subject of the fragrance, its central statement. Here one most commonly finds flowers (rose, jasmine, iris, tuberose*), spices (*pepper, cardamom, cinnamon), and green or fruity notes of medium persistence.
Heart notes define the fragrance’s identity and constitute, in the vast majority of compositions, the most developed and complex part of the structure.
Base Notes
These emerge progressively as the heart notes fade, and can persist for hours — sometimes days on fabric. These are the densest, least volatile materials: woods** (sandalwood, cedar, oud), **resins** (benzoin, labdanum, incense), **musks**, **amber**, **vanilla**, **vetiver. Base notes give the fragrance its long-term sillage, its memorable signature, the lingering impression that remains in olfactory memory after an encounter.
Why This Structure Actually Exists
The pyramid is not a formal constraint imposed on perfumers — it is a natural consequence of the physics of aromatic molecules. A fragrance built entirely from base notes would be heavy and suffocating from the very first second. A fragrance composed solely of top notes would evaporate within twenty minutes, leaving the skin with nothing.
The pyramidal structure allows for temporal narrative: an introduction, a development, a denouement. This is what perfumers call the evolving sillage — the capacity of a juice to tell something different over time, to surprise the wearer at the moment they least expect it.
Concentration also plays a role: an Eau de Cologne (2–5% concentrate) will evolve quickly, with limited base notes. An Extrait de Parfum (20–40%) will maintain a more stable profile over time, with slower, richer development.
The Limits of an Imperfect Model
Contemporary perfumery has broadly questioned the pyramid’s relevance as a descriptive tool — not to abolish it, but to nuance its use.
Some modern fragrances are constructed as accords rather than sequences. This is the case with so-called single-note* or *monochrome compositions — the kind associated with Frédéric Malle’s output or Comme des Garçons Parfums: one idea, developed vertically, without marked narrative progression. The pyramid is an unsuitable framework here.
Individual perception also disrupts any classification. Your body temperature, skin pH, atmospheric humidity, cutaneous microbiome — all of these alter the evaporation of molecules and transform a single fragrance into a different experience for each person. The pyramid describes an average behaviour, an abstraction, not a sensory certainty.
Finally, the boundary between the three levels is often deliberately blurred. Great perfumers construct molecular bridges between levels — they use materials that span multiple registers of volatility to ensure smooth transitions, an olfactory dissolve that makes the pyramid difficult to read as a strict sequence.
How to Use It When Choosing a Fragrance
Rather than reading the pyramid as a score to follow, it is better used as a compass.
If you are looking for a projecting fragrance — one that makes a first impression at a meeting or is noticed from a distance — focus on the top and heart notes, and on their initial projection. If you are seeking a fragrance of intimacy, something that follows you quietly through the day and rewards physical closeness, the base notes are your territory.
The best method remains application on skin and patience. Wear the fragrance, live with it for two hours, note what it becomes. It is at that moment — when the top notes have receded — that you truly meet what you are going to wear.
Three Examples from Maison Keïta
Oud Sauvage perfectly illustrates the tension between levels: a peppery, spiced opening that surprises and can initially unsettle, before the Cambodian oud and resins of the heart assert themselves in their fullness. The base notes of smoky wood and black amber remain for hours, long after the initial vivacity has yielded to something more solemn.
Velours Ambré is a fragrance with a short, dense pyramid: its top notes disappear quickly, and the amber-vanilla-powder accord takes possession of the skin from the twentieth minute onward and refuses to leave. It rewards those who do not trust the opening.
Tabac Impérial, finally, is a composition of slow and ample evolution, in which the tobacco note — neither quite in the top nor entirely in the base — traverses all three levels continuously, moving from faintly vegetal toward honey and milky leather without ever disappearing. A pyramid best read not as a succession but as a variation on a theme.