Tanzanite D block refers to a specific category of tanzanite that is known for its exceptional quality and vibrant color saturation. The "D block" designation typically indicates that the gemstone has been sourced from the premium deposits in Tanzania, renowned for producing the finest tanzanite crystals.

D block tanzanite usually showcases a deep, rich blue color with violet undertones, which is highly sought after in the gemstone market. These stones often exhibit strong pleochroism, meaning they can display different colors when viewed from different angles—ranging from blue to violet and even hints of burgundy.

In terms of clarity, D block tanzanite tends to have fewer inclusions, making them more desirable for use in high-quality jewelry. Their durability, rated at 6 to 7 on the Mohs scale, requires careful handling to maintain their beauty.

Metaphysically, D block tanzanite is believed to enhance intuition, facilitate communication, and promote spiritual awareness, making it a popular choice for those interested in the gemstone's emotional and spiritual properties.