Lab Created Square Blue Sapphire is part of a group of gemstones that have a natural chemical structure. Our Lab Created Blue Sapphire Square is Corundum. Corundum is ideal because it is chemically and crystallographically indistinguishable from naturally occurring gems. The flux method is used to create it. Our lab created Square Blue Sapphires are well cut, loupe clean, low priced and beautiful. Lab Created Square Blue Sapphires are an excellent substitute for its high priced counterparts. With proper care, lab created Blue Sapphires could last a lifetime.