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

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 ...

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 ...