Among sphalerite, quartz, garnet, and fluorite, which would make good gemstones or poor gemstones, and why?

Scientific answers please :)

Rose Quartz Where To Buy

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Yeah! ROCK STAR CRYSTALS! Unbelievable ROSE QUARTZ, especially the STAR ROSE QUARTZ from Madagascar, with 6 pointed bands of light radiating from within. Went there recently, and there were a couple of dozen star rose spheres, as well as star ROSE QUARTZ wands, rose quartz pyramids, and even NATURAL rose quartz clusters and crystals (really hard to get).