Ruby - July Birthstone
By: Dee & Noam ~
Ruby is the most valuable variety of the corundum mineral species, which also included Sapphire. Its name comes from Ruber – Latin word for red. In the purest form the mineral corundum is colorless. Trace elements that become part of the mineral’s crystal structure cause variation’s in its color. Chromium is the trace element that cause Ruby’s red. This ranges from an orangey red to a purplish red.
Color is the most important factor that affects a ruby’s value The strength of Ruby’s red depends on how much chromium is present-the more chromium the stronger is the red color. The finest is best described as being vivid medium to dark tone Red.
Ruby is one of the most historically colored stone. It’s mention four times in the Bible. In the ancient language of Sanskrit, Ruby is called Ratnaraj, or”king of precious stones”. Early cultures treasured Rubies for their similarity to the redness to the blood that flowed through their veins and believed that Rubies held the power of life.
The most renowned rubies, like those from Myanmar, the Himalayas, and northern Vietnam, typically form in marble. They’re found in layers that are distributed irregularly within the surrounding marble. Marble forms as part of the metamorphic (rock-altering) process, when heat and pressure from mountain formation act on existing limestone deposits. Marble has low iron content, so the rubies that originate in marble (called “marble-hosted” by gemologists) lack iron. Because of this, many have an intense red color. In other locations, rubies can be found in basalt rocks. Rubies from these sources can have higher iron content, which can make the rubies darker and less intense in color.
Rubies can command the highest per-carat price of any colored stone. This makes ruby one of the most important gems in the colored stone market. If you are looking to buy a ruby, read the GIA’s ruby buying guide at the link below: