I'd like to know somethings about seed pearls. I read they were both natural and cultured. I can't imagine going to the trouble to culture them, but for that matter I can't imagine drilling and stringing them. Do seed pearls have the same characteristics that larger pearls from the same bivalve have? For example: color, shapes, luster? I have seen some little half pearls. Are these blister seed pearls? Are seed pearls as widely used today as in antique jewelry?