Natural Iolite

The selected stone appears as a small, rounded polished cabochon with a very dark blue body color. Its surface has a subdued vitreous to waxy luster, with minor visible pitting or uneven texture under the camera lighting. The outline is irregular rather than calibrated, suggesting a freeform or tumbled cabochon style. The stone appears mostly opaque to semi-transparent in this image due to the very dark tone, so internal features are difficult to judge. The identification remains moderate-confidence because dark iolite can visually overlap with dark sapphire, spinel, and other blue-black materials in photos.