For those born in the month of March, the official gemstone is the Aquamarine. It can range in color from a very pale shade, almost colorless, which is also the most valuable, to a most sought-after deep-blue aqua.
The 10 Biggest Dog Breeds. 1  Tibetan Mastiff: This handsome dog is known for the lionlike mane around his head. He was bred to guard temples. The biggest Tibetan Mastiff is said to have been around 280 pounds, but these days they average 180 pounds.
The different mastiff breeds have been bred for guarding and for fighting. The two most expensive dog breeds in the world are the Tibetan Mastiff and French Mastiff. A Tibetan Mastiff. The largest Tibetan Mastiffs can stand over 31 inches tall and the breed typically weighs over 140 lbs. The dogs can be black, grey, brown or even, in some rare instances, completely white.