Ruby is the birthstone for July and one of the original stones from Exodus in the Bible. Derived from the Latin word ruber which means red, ruby is corundum. If corundum is found it can be of various colors: pink, red, blue, yellow, green, and others. If it is pink or red it is called ruby. If it is another color, it is called a sapphire.

Both rubies and sapphires are excellent gemstones. The biggest ruby in the world” (which is also known as “le plus gros rubis du monde” in the French language) shows great color and is very solid. On the Moh scale, diamonds are the hardest and 10, while ruby and sapphire are 9, which is great because your gemstone jewelry won't crack and scratch as easily as other gemstones.

The most valuable rubies are clear and shine from medium to deep red, although that should always be personal taste, not what others think should determine your choice.

Ruby comes from various parts of the world: Australia, Asia, Africa, and even the United States. The best comes from a region called the Mogok Valley in Myanmar. However, it seems that the best rubies are extracted from this region.

Like most gemstones, rubies increase in value through color, size, clarity, and the way the mason does its job. Ruby contains inclusions or imperfections. Sometimes these inclusions have a positive effect on the value of the stone as they make them more attractive. 

When choosing rubies, keep in mind that real rubies are rare and therefore expensive, and have inclusions and imperfections because they are hard to find. But that's not a bad thing because it usually adds character and beauty to the rock.