Synthetic color-change sapphires are fascinating because their strong color-change effect caused by high levels of vanadium overwhelms what most natural sapphires can exhibit. Quite often, you will be able to see both warm purple and cool violetish-blue colors strongly expressed at the same time.

Synthetic sapphires can come in three different shades – deep blue, light blue, and bright royal blue (the most popular among the three). Lab-Created Sapphire – Color and Varieties. The mineral corundum can yield different colors. It is broadly classified into two, with red corundum labeled as ruby, and all other colors of corundum called ...

It is possible to find corundum in almost any color in nature, and even with a color change effect depending on lighting (the so-called alexandrite effect). There are many colors of corundum supplied by RG Crystals. All the synthetic corundum colors were assigned certain numbers for the sake of simplicity and to avoid mix-ups during repeat orders.

Olga Tanskaia showed us their extensive color range of synthetic sapphire, spinel, beryl, garnet, and other lab-grown crystals produced using a variety of crystal growth methods. She noted that blue and red synthetic gems are always their best sellers.

Natural sapphires, which originate in certain igneous or metamorphic geologic environments are commonly treated to improve their color or clarity. The most common processes involve heat treatment to improve color. Synthetic sapphires have been produced for more than a century, mostly by melt, flux, or hydrothermal solution methods (Hughes, 2017).