1.9mm average sized Natural Multi Color Umba Sapphire micro faceted round beads have a vitreous luster, great polish, a symmetrical shaped body, the gem bodies are a a range of lightly to moderately saturated fancy Sapphire hues with transparent to opaque qualities, and these rare Umba Sapphire beads from Tanzania are a well crafted strand of unique and stunning quality AAA grade bead group. One of the unique characteristics of Umba Sapphire is that they are nearly never color treated.