It seems like you've mentioned several names and concepts related to opal crystals. Opal is a gemstone known for its iridescent play-of-color, which is the result of microscopic silica spheres diffracting light. However, terms like "Gem of God," "Gem of Heaven," and "The Cosmic River" might be associated with metaphysical or spiritual beliefs rather than scientific facts. Keep in mind that the following information is based on cultural and metaphysical beliefs, and there is no scientific evidence to support these claims.