Who invented fake diamonds of glass?

Fake diamonds made of glass, commonly referred to as "simulated diamonds," do not have a single inventor. The development of glass-based diamond simulants dates back to the 19th century, with various methods and materials being used over time. One notable figure in the creation of synthetic diamond alternatives is the French chemist Auguste Verneuil, who developed the Verneuil process in the late 1800s to create synthetic gems, though this primarily focused on corundum (sapphire and ruby) rather than glass diamonds specifically.