Aquamarine Transparent Sea Blue. Aquamarine can be quite  heavily included, to the point of being opaque; Aquamarine can also be one of the most transparent of gemstones. The above are good examples of the very best quality AGrade Aquamarine gemstones, clear and clean, free  of any inclusions, transparent.
Aquamarine is sourced from a number of localities, Pakistan, a number of regions in Africa, but the main source, for well over 100 years, is Brazil, the origin of the above gemstones. The deposits of Brazil are large, so Aquamarine is not classified as rare; however, it has always been more costly than blue Topaz or Amethyst or Garnet, for example, and world-wide demand has in recent years caused its price to gradually escalate, especially for eye-clean specimens of best sea blue such as the above.