Precious gems are formed in different ways and composed ... They're also identified by the ways in which they break, or the type of mark, or streak, that they leave when rubbed on a laboratory ...

(WSFA) - Learn about the importance of precious gems and minerals and ... to museum quality mineral specimens, fossils, all types of jewelry and gemstones, amber and other unique stones and ...

Semi-precious gems are also having a moment, driven by concerns about ethical mining and lab-grown doppelgangers. It’s time to take a look. Insofar as we’ve covered diamonds before in this ...