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What is the difference between precious stones and semiprecious stones? The dictionary describes semi-precious stones as being less valuabl

The best picture jaspers in the world come from the Oregon-Idaho border. Jasper is a member of the chalcedony family.Chalcedony, pronounced

Where do I find somebody to tell me what my rock or mineral is worth? The most common question I receive is some variation on “Where d

For many rock collectors it is not about beauty, or rarity, or location.  Fluorescence is about how that rock or mineral looks under a