48.25 carat Natural Spinelspinels Natural Mix color pastel colors Spinels calibrated shape and sizes. Spinel Characteristics Colors: Spinel is found in a range of colors, including red, blue, pink, orange, purple, and even black. The most valuable colors are typically red and cobalt blue. Clarity: Spinels are often praised for their excellent clarity, which allows their colors to shine vividly. Durability: With a hardness of 8 on the Mohs scale, spinel is a durable gemstone