hello, just look at the appearance: this should be a pair of crystal glasses, assembled, not a brand. The frame should be an alloy frame. If it is expensive, it should be on a stone lens. There are two kinds of stone lenses, natural and artificial. I can't see your lens here. The stone lens ranges from tens of yuan to several thousand yuan. I hope you have understood it. It was given by a friend. In fact, as long as it is comfortable to wear, it doesn't matter what brand it is. Personal judgment, for reference only