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The global supply of Tanzanite is constrained, and mining operations have been facing challenges over the years due to declining yields, increased mining costs, and government regulations. Over time, some experts have speculated that Tanzanite may eventually be depleted because the mineable areas are finite, and as more resources are exhausted, the availability of quality rough stones decreases.

Tanzanite is prized for its distinctive blue-violet color, which results from its trichroism — a property that allows the stone to show three different colors depending on the viewing angle. Tanzanite can appear blue, violet, or burgundy, making it especially unique. The best-quality Tanzanite has an intense, vibrant blue color, which is in high demand, adding to its rarity and value.

Tanzanite is rare due to its exclusive geographic origin, difficult mining conditions, and finite supply. As the gemstone continues to be highly sought after for its beauty and uniqueness, its rarity only adds to its value, and it is likely to become even more precious as supplies diminish over time.