Rubies are considered one of the four precious stones. The other ones being the sapphire, diamond, and emerald. It is also one of the hardest stones. Their value is determined by the color with the red or 'pigeon blood - red' being the most valuable.
Very few stones have been found in the United States in areas like Montana, North Carolina, and South Carolina. Most rubies come from Myanmar, Thailand, Cambodia, and Afghanistan.
One of the largest ruby gemstones in the world is at the Museum of Natural History in Washington DC. It is 23.1 carats.
These beautiful 'ruby' supplies are available from Team ESST