Why the emerald is so fragile (and how can a hammer split a diamond?)
"A hammer cannot scratch a diamond, but the hammer can break the diamond into a thousand pieces!" How is that possible? Using the hardness scale to help you choose your...
"A hammer cannot scratch a diamond, but the hammer can break the diamond into a thousand pieces!" How is that possible? Using the hardness scale to help you choose your...
How are you going to choose among all the beautiful gemstones? Of course you should choose the gemstone that you fall for! But there is one characteristic of all stones...