Subsoil: a resource
Aquamarine, rubies, sapphires....
Aquamarine, a sea-blue stone, probably owes its colour to the presence of iron. The main deposits are located in different areas of Brazil, Ural Mountains and Madagascar. Extremely small and clear crystals were found on the Island of Elba. Ruby and sapphire represent the most valuable varieties of corundum. The colour of ruby can range from pink to red, also very dark red. Ruby is one of the most precious stones and its colour derives from the presence of chrome oxides. Sapphire is less expensive and less precious than emerald and ruby. Its colour varies from light blue to deep blue and derives from the presence of titanium and iron. The main deposits of sapphire and ruby are located in Myanmar, Thailand and Sri Lanka. Topaz is a stone that can have different colours (light yellow, dark yellow, pink, red, light blue, greenish) and can reach big dimensions. The main deposits are in Brazil and Russia.
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