Emerald Characteristics. 1  Emeralds are the most precious of the beryl gemstones and related to aquamarine. 2  The word emerald is derived from the Greek word smaragdos and means green stone.. 3  Pure beryl is colorless. 4  The signature grass green color of an emerald is due to trace amounts of chromium and vanadium.
Place the baking dish with the chicken breast into the oven on the center rack and cook for 20 to 30 minutes, or until the middle of the breast reaches 160 degrees.
1 Reduce heat and cover, simmering until the chicken is no longer pink or when the temperature reaches 170 degrees F. 2  Whole chicken breasts will take about 15 to 20 minutes. 3  Chicken breasts cut into pieces won't take quite as long to cook, while whole bone-in chicken breasts will take slightly longer. Reduce heat and cover, simmering until the chicken is no longer pink or when the temperature reaches 170 degrees F. 2  Whole chicken breasts will take about 15 to 20 minutes. 3  Chicken breasts cut into pieces won't take quite as long to cook, while whole bone-in chicken breasts will take slightly longer.