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Ruby

The most valuable mineral species

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. In its purest form, the mineral corundum is colorless. Trace elements that become part of the mineral’s crystal structure cause variations in its color. Chromium is the trace element that causes ruby’s red color.

The strength of ruby’s red depends on how much chromium is present—the more chromium, the stronger the red color. Chromium can also cause fluorescence, which adds to the intensity of the red color.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ruby

 

The most valuable mineral species

 

Rubies can command the highest per-carat price of any colored stone.

in the colored stone market. In its purest form, the mineral corundum is colorless.

Trace elements that become part of the mineral’s crystal structure cause variations in its color.

Chromium is the trace element that causes ruby’s red color.

The strength of ruby’s red depends on how much chromium is present—the more chromium,

the stronger the red color. Chromium can also cause fluorescence,

which adds to the intensity of the red color.