The most valuable gem variety of crystalline quartz, amethyst ranges in color from pale lilac to deep reddish purple. The official birthstone for those born in February, amethyst is said to guard against drunkenness.
Symbolizing nobility, perfection and immortality in Chinese culture, jade is a general name for two different minerals—jadeite and nephrite. Though nearly identical in appearance, jadeite and nephrite have distinctly different mineral compositions. Rarer jadeite is usually a vivid green, but can also be lavender, red, orange, yellow, brown, white, black or gray. Nephrite ranges from creamy white to green to almost black.