Ruby and Sapphire Natural 9-10mm Round - 15-16 Inch 13x20-20x28mm currently believed to be due

currently believed to be due to the presence of a copper-based mineral such as Malachite or Azurite

It is not a granite

It is opaque and occurs in a wide variety of colors

among other numerous names

it lightens because of further weathering and becomes Malachite

Ruby and Sapphire Natural 9-10mm Round - 15-16 Inch 13x20-20x28mm currently believed to be dueRuby has long been considered one of the most beautiful and valuable gemstones on the planet. It is also one of the hardest, second only to Diamond. At times in ancient history, Ruby was valued more highly than any other gem, including Diamond. Its believed that Kublai Khan once offered an entire city in trade for a sizable Ruby.