German glasses brille extends from beryl, γιατί οι πρώτοι φακοί γυαλιών ήταν αλεσμένοι με άχρωμο βηρύλιο. The color of beryl gemstones is one of the classification criteria. (1) Σμαράγδι. With chromium or iron as the color characteristic, green beryl with emerald green color can be slightly yellow or blue, and its typical characteristic is the [...]
