For a perfume junkie, I have a rather modest Diptyque collection.
Just three scents that to me feel almost introspective and subtle for their respective genres. Just like the brand itself, they have a luxuriously subtle and easy-going charm. They need time to introduce themselves and surprise you.
I would describe Diptyque scents as straightforward in a way; they have a clear artistic vision and don't beat around the bush too much. But at the same time I never feel the need to layer these scents. That would mask or mess with the subtler facets and nuances they have.
In fact, I was told recently by a brand rep that they insist on using higher concentrations than most generic brands on the market, so even peripheral items like the hair mist will contain up to 18% perfume components, which is higher than many Eau de Parfums. Usually this means they perform like extrait de parfums; lower in throw but higher in longevity. For the most part I can spray these on in the morning and not have to bring the bottle out for touch-ups.
Quick side-note: most of Diptyque's scents have an Eau de Toilette concentration (clear bottles) and an Eau de Parfum (black-rimmed bottles). They have different compositions and notes, designed to amp up different facets of the overall scent, so make sure you test both concentrations to see which works better on your skin.