Pequenas contas de safira azul natural redondas de 2, 3, 4 mm, contas de pedra facetadas para fazer joias, colar, pulseira, acessórios faça você mesmo

The stone is natural, no doubt about it. The different arrangement of holes in the beads spoils the impression a little. Because of this, the threads are not even, and when making a bracelet, sorting and spacer beads will be necessary.

I don't know for sure if these are sapphires or blue tourmaline, but it looks quite impressive and is most likely one of the natural stones.