The range of colours shown by fluorite is equaled by few other gemstones. It may occur in beautiful cubic crystals or as a massive crystalline variety displaying banded or radiating patterns. Although the stone is somewhat soft for use as a normal.
Opal is a stone of sympathy and compassion, pure thoughts & confidence. It is the most unpredictable stone, a symbol of ever-changing fortune. According to legend an opal talisman boosts foresight--dunno about that but it is my favorite stone.
Precious gem variety of olivine. One of the few gems that occurs in only one color. A celestial, astronomical mineral found in meteorites. At one time, it was more valuable than diamonds. Birth stone for August.