A Ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. Ruby is considered one of the four precious stones, together with sapphire, emerald and diamond
PRIMARY GEMSTONE: Natural Ruby: Ruby is a variety of Corundum Specie. Being from the corundum specie the basic chemical composition is Aluminum Oxide (A1203). Natural Rubies are red in color because of the presence of Chromium and sometimes a purplish tone because of Iron. Astrology also proves the correlation of Red color due to Chromium element with the planet ‘Sun’ i.e. Fire. Natural Ruby has a high hardness of ‘g’ on the Moh’s scale of hardness. The other physical properties of Natural Ruby includes a high refractive Index of ‘1.762-1.770’ and moderate specific gravity of 4.00’.