If your sun is in Leo, crystals have no doubt caught your beauty-loving eye before. According to Cafe Astrology, Leo is the sign of the lion, ruled by the sun. And like the sun, Leos are known for their warm disposition, love of the spotlight, and all that glitters. The recent boom in holistic practices has brought healing crystals and their energy to the forefront of alternative therapies, according to The New York Times, and Leo, you are all over this. In fact, a Leo might admit, "An excuse to buy pretty, sparkly rocks that will give me superpowers and help me sleep better at night? Say less." 

Crystals are most effective when used in combination with clear intention, and different stones can bring about different effects. According to Divine Twist, Leo is traditionally associated with stones that are used to aid in matters regarding confidence and taking action, like Tiger's Eye and Carnelian. But you might be wondering if there are stones that an authority-loving Leo should avoid all together? The short answer is yes.

Black Onyx is known for its effectiveness in helping with shadow work, which is used to access the subconscious part of your personality or the "dark side" that we are not able to see. According to Cosmic Cuts, "It is a powerful strengthening stone that can help us alleviate traumas that may stem from our past." 

This sounds great in theory, but for light-hearted Leo, its energy can feel heavy and stagnating, bringing down your exuberant demeanor. Per the International Gem Society, ancient cultures also found the stone to be menacing. For example, 19th century China did not allow the trade or sale of Onyx within the country due to its perceived ability to bring about "bad dreams, misfortune, and loss of energy." Elite Daily spoke with crystal expert Alexis Alvarez who categorized Black Onyx as having "very dense energies." Maybe it's best for you to give this one a pass for now, Leo.

Leo is a fire sign and Aquamarine is a crystal that is very closely associated with water. Do you see where we are going with this? According to Crystal Alchemy, Aquamarine can "calm an overstimulated mind" and "calms stormy seas inside one's spirit." While this may sound tempting, these notions go against your fundament nature, Leo. 

You're fire. You're leadership. You're passion. Anything that is going to sedate your action-oriented, authoritative nature may be something you use sparingly, or not at all. One downside to the sign of Leo is that occasionally the lion can be a little, well, lazy (via Pinkvilla). Surrounding yourself with the energy of a stone that has a serious down note may not be the best choice. Plus, you don't need anything that is going to dull your shine. If you're looking for an alternative to help calm and center yourself, try something like Citrine. Its yellow color will better resonate with your sunny nature.

This stone may be something that you have never heard of Leo, and maybe it's something that you should continue to avoid. Per The Crystal Council, Isua stone is found in only one place in the entire world, the Isua Greenstone Belt in Nuuk, Greenland. It is said to be the oldest known mineral on Earth with an average age of 3.7 to 3.8 billion years old. For all of the geologists out there, that puts its formation very early in the development of our Earth. 

Isua is known to hold all the mysteries of the past, but it is also used to "'escape' the physical body," according to The Crystal Council. Since Leos are known for their love of the physical — their love language is physical touch, according to Well + Good — anything that is going to orient your soul elsewhere should be avoided. Living in the moment is your passion, per Pinkvilla, as well. 

So while Isua may sound appealing for its ability to help you channel your power, it can also bring about "mayhem" and "destruction" and no one needs that while you're out here trying to live your best life, Leo.