Gemstones like precious opal are beautiful to look at and deceivingly complex. As you look at such gems from different angles ...

Select an option below to continue reading this premium story. Already a Honolulu Star-Advertiser subscriber? Log in now to continue reading. The composition of the pure mineral determines color of ...

Alexandrite is a gemstone coming into popularity because it is one color by day and another color by night. We’ll tell you how it manages this color transformation. Aalexandrite is a saucy mix of ...