Diffusion is a treatment process that uses heat and chemicals to diffuse an element into a gemstone to artificially change its color.
Our sapphires are natural, non-synthetic stones that has been dug out of the earth, but is then subjected to high heat in an oven. This causes the atoms to penetrate or diffuse into the sapphire, altering its color.
Sapphires, are composed of the mineral corundum, a mineral that can be, but is not rare in every shape and form. But, an untreated sapphire is exceptional because of its natural color and clarity. And also because of the rarity. Untreated sapphires are rare, because almost all sapphires are heated at extremely high temperatures to boost their color and clarity.