Gemstones: Facts, photos, and information for over 100 gems. - Geology
Blue Gemstones - Most people shopping for a colored stone are looking for something blue. Green Gemstones. Green Gemstones - emerald, peridot, jade, ... Yellow Diamonds are the most valuable yellow gems and the 2nd most common fancy diamond. Zircon. Zircon is a popular and colorful gem with fire and brightness that rivals diamond.