There are several crystals that are believed to help with stress. Some of the most commonly recommended ones are:

1. Amethyst: known for its calming and grounding properties, this purple crystal can help reduce anxiety and promote relaxation.

2. Rose quartz: this gentle pink crystal is often associated with love and emotional healing. It can help ease emotional stress and promote feelings of peace and tranquility.

3. Smoky quartz: this brownish-gray crystal is said to absorb negative energy and promote emotional balance. It can help ease stress and promote a sense of calm and stability.

4. Lepidolite: this lavender-colored crystal is known for its soothing properties. It can help ease anxiety and promote feelings of calm and relaxation.

5. Celestite: this light blue crystal is said to promote mental clarity and calmness. It can help ease stress and anxiety and promote a sense of peace and tranquility.