April’s birthstone is diamond, and I must say this one was a challenge! What is the essence of diamond? It sparkles, but the most common image is of a clear gem. Diamond is made of carbon, as is a graphite pencil! If you took geology in school, you may remember the Mohs scale of hardness of rocks, and Diamond is at the top of the scale, with a 10. In fact, diamond comes from adamant, unbreakable, invincible, unshakeable. It’s hard because of the way the carbon has crystallized in a different formation than graphite. Same substance, different shape. I’ve never felt diamonds are a girl’s best friend, or that they are forever, but I do like sparkle, and glass does that quite well for me!