Black Moonstone is a stone of deep feminine energies. It enhances intuition and inner knowing. Black Moonstone helps one to connect with their feelings and emotions on a very profound level; opening blockages and allowing for guided healing from past emotional trauma. Black Moonstone is a stone for "feeling", and understanding via intuition and emotional "thoughts", rather than via intellectual reasoning.
Also called the Womb stone, the black moonstone encourages fertility. It also helps connect us to " new moon" energies, which corresponds to the birth of new things... from babies, projects, to ideas. If you are about to start something important and new, the black moonstone would still be a good stone for you.
I also like it in crystalline grids from anything from intuition, creativity, fertility, connection to any counter-part of the Divine Feminine, to healing shadow.
It will help attract a gradual increase in your finances.
Other areas that the black moonstone is particularly good for are the colon, kidneys, liver, spleen and stomach and female reproductive organs. It can also be helpful for stroke recovery and brain function.