5257. Art Deco gold ring with diamonds and a blue sapphire.

Art Deco 14 -carat gold ring with 14 rose-cut diamonds set in silver and a synthetic blue sapphire.

Synthetic sapphire: The word “synthetic” means that the stone was created under laboratory conditions. Its chemical composition (Al₂O₃) and crystal structure are identical to those of natural sapphire, and its fundamental physical properties are essentially the same. Sapphire is a variety of corundum, which can occur in many colors other than blue. Its color can be caused by various trace elements, such as iron and titanium, or other coloring agents. The difference between natural and synthetic sapphire primarily lies in their origin and the way they are formed. Synthetic sapphire is a genuine sapphire, not an imitation, but it is produced in a laboratory setting.