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Blue green semi precious stone is an ancient jade. The crystals of loose precious gemstones are generally barrel-shaped or columnar and plate-shaped. The vertical direction of mineral crystals of purple semi precious gemstones is called C-axis. Precious stones can be cut into facets with facets X or facets Z. When we cut jasper semi precious stone, we need to do everything possible to make the table top perpendicular to the C axis.