Perfume: The perfume you see in the store is not the pure perfume essence and has been diluted. However it is the most concentrated of all the fragrance options and it is the most expensive for this reason. It tends to be slightly oilier and will typically contain 15-40% pure perfume extract. It has a slightly thicker, oilier consistency. It tends to be sold with ‘stopper bottles’ and not sprays. It is too strong to spray all over (and too expensive).
The percentage of pure perfume extract is not necessarily an indicator of the quality of perfume though. As mentioned there are many essential oils that you wouldn’t want to smell like in small doses (spikenard comes to mind). Real musk and ambergris are expensive and not pleasant in their pure form, so whereas a single drop can dramatically increase the price of a perfume, but you wouldn’t want more than that single drop, which would be sublime.