Which gem is classified as Type III?

The classification of gemstones into types is based on their clarity characteristics and the presence of inclusions. Type III gems are typically those that are included and often show a variety of natural or synthetic inclusions, which makes them less transparent and impacts their clarity.

Emerald is classified as Type III due to its well-known habit of having inclusions, which may include liquid-filled cavities, gaseous inclusions, and other minerals. These inclusions are often visible to the naked eye, affecting the clarity and appearance of the stone. The presence of such inclusions is well-accepted and even expected in emeralds, adding to their uniqueness and character.

In contrast, rubies and sapphires are generally classified as Type II, where they may have some inclusions but are expected to be relatively clearer than Type III stones. Aquamarine falls under Type I, indicating that it typically has very few or no inclusions visible to the naked eye. Therefore, emerald is correctly identified as Type III due to its characteristic inclusions that define its identity as a gem.