The rarest rubies come from Burma (Myanmar), due to their high quality and exceptional color. The diamond is the only natural gemstone harder than a ruby.

One of the surprising facts about rubies is that their hardness comes in second place to diamonds. Few rubies grow large enough to crystallize into fine quality gems-the value of these pieces can be even higher than diamonds. They are tough and durable, yet the chromium can cause cracks and fissures. Ruby gemstones measure 9 on the Mohs scale. They are also mined in Afghanistan, Australia, Cambodia, India, Madagascar, Malawi, Mozambique, Pakistan, Sri Lanka, Tanzania, Thailand, the United States, and Vietnam. The finest rubies come from Burma (Myanmar). Where are rubies found in the world? Where are rubies mined? If ferric iron is also present, the ruby will be a shade of orange or pink. This mineral, along with the presence of chromium, creates rubies and their distinct hue. When compressed, oxygen and aluminum atoms turn into corundum.

Like many gemstones, rubies are made under extreme heat and pressure below the earth. American Gem Society Titles & Designations.Advanced Personal Property Appraisal Course (APPA).The Practical Guide to Jewelry Appraising.

The History of the Diamond as an Engagement Ring.History of the Diamond as the April Birthstone.

Sapphire and ruby gemstones