Gemstone few as one in a million atoms. These so-called impurities are sufficient to absorb certain colors and leave the other colors unaffected. For example, beryl, which is colorless in its pure mineral form, becomes emerald with chromium impurities. If manganese is added instead of chromium, beryl becomes pink morganite. With iron, it becomes aquamarine. Some gemstone treatments make use of the fact that these impurities can be "manipulated", thus changing the color of the gem. Gemstones are often treated to enhance the color or clarity of the stone. Depending on the type and extent of treatment, they can affect the
Zoysia 'Emerald' Zoysia 'Emerald' Emerald Zoysia ("Zoysia" 'Emerald') is a cultivar of "Zoysia" grass with a thin bladed leaf that forms a very lush lawn. It shares the drought and shade resistance of the other varieties. This grass has a fine, soft texture and can be left unmowed as it only grows to a height of . When left unmowed, it forms a humpy convoluted surface which is sometimes used in oriental landscapes (see picture on Zoysia page). Emerald Zoysia is adapted to zones 7-11 and does well in warm, humid environments. It is an excellent grass for the southern and southeastern