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 ...

Using ink made from synthetic photonic crystals and a printer that can modulate voltage, the team has figured out how to print shimmering, color-changing patterns onto a stretch of flexible opal. The ...