He said Gemologists M.J.M. Dharmasekara and Janaka Hemachandra who performed the microscopic examination identified it as a blue sapphire of the natural corundum stamp. “They told me that it is ...

or corundum. Worldwide, these characteristically blue-colored crystals are mainly found in association with silicon-poor volcanic rocks. This connection is widely assumed to result from sapphires ...

Now, sapphires are predominantly made up of aluminum oxide in the form of corundum, but other elements can become mixed in. The deep blue hue that sapphires are known for comes from titanium and ...