It still looks like a raw diamond to me, and I've found a few. They are not always in the textbook shape, but can come in weird shapes that are called Oddities. Might be glass but I can't see any concoidal fracturing anywhere which occurs with glass, whereas a diamond will fracture in straight lines which are called cleavage. The flower you are seeing might be an inclusion of some sort. It might cost you, but you might want to think about having a gemologist check it out, that is what I did with any suspect stones that I found when panning gold in a known diamond bearing area. A lot of them were quartz, but a few diamonds were present too. Quartz will also cut glass, so that's not the best test. The gemologist I used would put the stones into a clear liquid, and if they were quartz you couldn't see them, but diamonds stood out. Anyways a very interesting find. Cheers!!
