Gemstone irradiation produce mixtures of blue and yellow-to-brown colors, so heating is required as an additional procedure to remove the yellowish color. In some cases, the new colors induced by artificial irradiation may fade rapidly when exposed to light or gentle heat, so some laboratories submit them to a "fade test" to determine color stability. Sometimes colorless or pink beryls become deep blue upon irradiation, which are called Maxixe-type beryl. However, the color easily fades when exposed to heat or light, so it has no practical jewelry application. Gemstone irradiation The gemstone irradiation is a process in which a gemstone is artificially
Zoysia 'Emerald' requiring no more than two light distributions per year. 8-8-8 or 13-13-13 fertilizer is recommended. If over fertilized, it will turn yellow and could die. Since regrowth of this grass is slow, its best to err on the light side of fertilization than to over fertilize. 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