A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. Ruby is considered one of the four precious stones, together with sapphire, emerald and diamond.

are the third installments of the Pokémon series of role-playing video games, developed by Game Freak and published by Nintendo for the Game Boy Advance. The games were first released in Japan in late 2002 and internationally in 2003. Pokémon Emerald, a special edition version, was released two years later in each region. These three games (Pokémon Ruby, Sapphire, and Emerald) are part of the third generation of the Pokémon video game series, also known as the "advanced generation". A remake of the two games, titled Omega Ruby and Alpha Sapphire, were released for the Nintendo 3DS onward worldwide on November 21, 2014, exactly twelve years to the date of the original Ruby and Sapphire release date, with the exception of Europe, where it was released on November 28, 2014.