To choose the right crystal for your friendships, it's helpful to consider what you are looking to achieve or work on in your relationships. For example, if you are looking to strengthen existing friendships, you might consider crystals such as rose quartz or rhodonite. If you are looking to attract new friendships, you might consider crystals such as citrine or aquamarine. If you are looking to mend a broken friendship, you might consider crystals such as amethyst or apatite. It's also helpful to consider the specific energy and properties of each crystal, as well as your own personal preferences and intuition.