It is available as a Ruby Gem. Sapphire is the birthstone for September and the gem of the 45th anniversary. All other hues of the gem species corundum are called sapphire. Jade was considered the "imperial gem". They are often associated in colors with the elements, precious metals, stars, and gem stones. Aaron calls it "a shining gem of a tune". What about the rest of Crystal Gem society? Rita Houston of National Public Radio called "Royals" a "polished little gem of a song". Later she established Hyderabad Institute of Gem and Jewellery. This power comes from his soul gem. It was originally called a "Soul Gem". These qualities made it unpopular in the gem trade. About.com called it a "true gem of a love song". Doctor Strange tries to get Adam Warlock to give up the Soul Infinity Gem. He fails, and Warlock traps him in the Soul Gem.