That's a standard turquoise betta splendens without the gene for spread iridescence, hence the black-ish head. The appearance of the caudal rays looks like it's a veil tail.
It's hard to definitively sex from these photos. It's either a very young female (can't gauge size from the photos, and an older female would have a definite belly) or a male. The look of the pelvic fins would lend a clue, but we can't see them.
It's hard to definitively sex from these photos. It's either a very young female (can't gauge size from the photos, and an older female would have a definite belly) or a male. The look of the pelvic fins would lend a clue, but we can't see them.