There are many types of crystals that are believed to encourage good luck, but here are some of the best ones:

1. Aventurine - This crystal is often referred to as the "stone of opportunity" and is said to attract success and prosperity.

2. Citrine - This bright yellow crystal is believed to bring abundance and has been dubbed the "merchant's stone."

3. Jade - A popular stone in Chinese culture, jade is said to bring good luck and protect the wearer from harm.

4. Pyrite - Also known as "fool's gold," pyrite is believed to bring good luck, wealth, and success.

5. Tiger's Eye - This brown and gold stone is said to promote clarity, focus, and good luck.

6. Clear quartz - This versatile crystal is believed to amplify positive energy, increase clarity, and improve overall well-being.