Is treating a gemstone okay?


In many cases, treating a gemstone is routine. Below are two examples:

• Most Emeralds are heavily included and are often oiled to improve their clarity. This type of treatment is not permanent.
  
• Virtually all Tanzanites (Zoisite) are actually brown when extracted from the ground and only turn blue/purple coloring after heat treatment. Heating is permanent.
  

Before purchasing a gemstone, consumers should confirm if and what treatments were used on a gemstone.