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Sapphires, are simply crystallized alumina (Al2O3) and in their pure form are devoid of color. Yellow sapphire connected with Jupiter mostly found in Srilanka with Hardness of 9 on the Moh’s scale.
Blue sapphire is a natural occurring gemstone of the corundum family with Mohs scale 9 basically. Blue Sapphire ranges in hue from pale to deep azure or dark royal blue, to indigo.
Emerald is the Green color stone with a hardness of 7.5 – 8 Mohs scale. found mainly in Columbia, Brazil, North Carolina USA. Emerald is the birthstone of month May.
Coral symbolizes life and blood force energy. Coral is a product of the sea and hardness is less than 4 on the Moh’s scale. Corals are found in India, Italy, Australia, Sri Lanka, Japan, Malaysia, South, Africa, Algeria and U.S.A.
The name Ruby comes from Latin ‘Rubrum’, which means ‘Red’. Ruby, which is corundum, is simply crystallized alumina (Al2O3) and in pure form it is devoid of color and hardness is 9 on the Moh’s scale.
Its name comes from Greek ‘esson’ meaning ‘inferior’, since this gemstone is supposed to be less valuable. Hessonite or Gomedh is a Gem of the Garnet family with hardness of 7.25 on the Moh’s Scale and Refractive Index is 1.74.