A period is a bleed from the womb (uterus) that is released through the vagina. It happens approximately every 28 days, although anywhere between 24 and 35 days is common. Periods can begin when girls are between 8 and 16 years old, but usually start around the age of 12.
Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5â8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.
Emerald Meaning. The name of this green crystal is said to come from the Greek word meaning green stone. They are the green variety of Beryl and natural Emerald stones are popular stones for jewelry. Deposits of Emerald stones have been found in India, Russia, Zimbabwe, Africa, Egypt, Austria, Brazil and Columbia. Bixbite.