Alexandrite gemstones, there are two types - natural and lab-created. Natural Alexandrite is a rare and valuable gemstone that is formed in the earth's crust, while lab-created Alexandrite is made in a laboratory. Both types have the same chemical composition and physical properties, but natural Alexandrite is more expensive due to its rarity. When shopping for Alexandrite jewelry, consider the origin of the gemstone to ensure that it meets your preferences and budget.