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Topaz is pure transparent but often opaque due to impurities in it. Topaz is typically wine-colored or pale yellow. But it could be white, gray, blue, green. Colorless topaz, when well cut, can be mistaken for a diamond. Coloured topaz may be less stable or discoloured by sunlight. Among them, the best deep yellow is the most valuable, the yellower the better. Followed by blue, green and red.

Both natural and modified topaz stones are evaluated by color, clarity and weight. Dark color, good diaphaneity, large block, no crack is the best product. Topa stone is required to be rich in color, pure, uniform, transparent, less defect, weight at least 0.7 carat. Topa stone has brittleness and reconciliation, afraid of knocking and beating, easy to crack along the cleavage direction, should always pay attention to wearing. Because topazite develops cleavage parallel to the bottom, it is necessary to prevent the cutting surface from being parallel to the cleavage surface. Otherwise, it is difficult to grind and polish, and care should be taken when inlaying, so as not to induce cleavage and destroy the shape of the gem.

The meaning of topaz：