To me, he looks like a royal blue halfmoon (possibly a rosetail? Can't tell unless he flares) with a very thin white butterfly band. He's not a dragon scale, as dragon scaling is a secondary layer of scaling over the body. True dragon scales are white on their bodies, and iridescence can mimic dragon scales. He is quite pretty though! Don't be shocked if he loses the white band and goes all blue. My teal butterfly boy did that.