Classification and color classification of five elements

White belongs to gold in the five elements; Cyan and green belong to wood; Blue and black belong to water; Red belongs to fire; Yellow belongs to the earth. According to this principle, find the corresponding crystal ornaments.

Metal crystals include: ivory crystal, white tourmaline, white ghost and white agate;

Wood crystal: green crystal, green ghost, green hair crystal, green tourmaline, green agate, amethyst;

Crystal: black crystal, nigger, black tourmaline, aquamarine, tea crystal, obsidian, blue crystal, black agate;

Fire crystal: red crystal, tourmaline, garnet, red ghost, red pill, amethyst;

Earth crystals: topaz, topaz, tiger eye stone, yellow ghost, topaz.