These are Tanzanite cabochons. They have a lovely light blue-violet coloration, giving them a nice subtle pop. If you are searching for a blue-violet for your gem palette, this is it.
6 x 8 x 4mm approx. (sizes can vary up to 1mm)
Transparent/Semi-transparent, pieces have internal fractures and inclusions, as well minor variances in shape/color per stone.