Considered to be one of the primary zodiac birthstones for Leo, Carnelian and Leo both share the element of fire. Bursting with energy and life, Carnelian is recommended for those who need a boost in energy, creativity, and passion (whether professionally or in their romantic lives).
 
Pyrite is an excellent stone for dispelling fear, particularly fear of how others see us. Leos, while generally confident, tend to also suffer from issues of self doubt.
 
Sunstone is widely used as a stone for leaders, as it boosts mental clarity, physical strength, personal power, and generosity. It further boosts Leo's innate benevolence- the willingness to help others in various aspects of life.
 
As Leos are naturally gifted in the arts, having a Citrine crystal in your place of work, especially if you're an artist, can be very beneficial for your career. This is especially true if you run your own business, as Citrine welcomes prosperity in all levels of your professional life. 
 
Garnet is also a stone of commitment, especially when it comes to romantic relationships. Leos are very loyal people, especially to their partners and families. Garnet can help boost these positive traits, especially when one's relationship hits a rough patch.