The emollient plant oil that comes from almonds. Similar to other plant oils, it is loaded with skin-nourishing fatty acids (oleic acid - 55-86% and linoleic acid 7-35%) and contains several other skin goodies such as antioxidant vitamin E and vitamin B versions.
It's a nice, basic oil that is often used due to its great smoothing, softening and moisturizing properties. It's also particularly good at treating dry brittle nails (source)
By experience (my own and others, read without discussion aforethought), this has a supernaturally good effect on dark circles. Perhaps because of the high oleic acid content that can penetrate? Anyway, I'm superstitious and use it after Renova on my undereye circles at bed every other night.