Amethyst is also used as a masculine given name in English. However, it's more common for females. So, I think that the "Gender" of this name should be updated from "Feminine" to "Feminine & Masculine". A known male bearer of this name is Amethyst Bradley "Surprise" Ralani. Source: https://en.m.wikipedia.org/wiki/Amethyst_(given_name)
Source: https://en.m.wikipedia.org/wiki/Amethyst_(given_name)