Amethyst Gemstone Soap Amethyst Gemstone Soap is effective for both dry and normal skin types. A trio of oils; coconut, jasmine and jojoba, create an incredibly soft moisturising foam and give an exquisite fragrance. Amethyst Gemstone Soap is a replica of the real stone, reproduced in a high quality soap. You can also buy this beautiful gemstone soap in the sets, Secrets of Arabia 4 and Secrets of Arabia 7.