You know, I tend to think that people's insecurities constitute a lot of their personalities. Think about the nature of insecurities: they are feelings of doubt of our abilities and dissatisfaction with our actions, and though they may have basis in reality, they are self imposed. They understand this and so they try to cache them away as far as they can. They put them behind an exterior and make their outward actions detract from the visibility of the insecurities. And so, they begin to like the exterior rather than the core. But soon some may realize the mask. This tends to make others wonder what goes on the minds of others who possess many such insecurities - many such diamonds. Some may become curious enough to want to try to scratch the surface but it makes us uncomfortable enough so that we stop them from doing so, but every now and then some perceptive person senses these insecurities people have. They sense them so strongly that the exterior does nothing. It's when people see us for who we are that we become happy and, briefly, satisfied. But when people see deep into us, we see deep into ourselves as well. We have to then look at our own insecurities that we stowed away before. And this makes us feel, as you said, vulnerable.

"Diamonds are pretty, Diamonds are tough, Diamonds can shatter." When letting someone in, we run the risk of becoming so vulnerable that we break down, but think about the fact that you compared diamonds to insecurities - if diamonds can shatter, so can our insecurities. When diamonds shatter, we're left with more though. No one can remove all of their insecurities, and challenging one challenges another and another. When a gemstone breaks, we are left with more gemstones. Some people would have you think that insecurities are flaws, but they are what, in part, make us who we are. Without them we could not be our wondrous selves. Without them, we could not "shine." But when diamonds break, what are you left with? More diamonds. This cycle of confronting our insecurities and confronting the next after the next molds us into what we will become one day. This process is long and arduous. Much like the formation of diamonds.