Opals! Photonic crystals! Structural color! Opals are examples of natural photonic crystals. They are composed of small ...

Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy. After investing tens of thousands of ...

Its symptom is a relentless pursuit of opal, which is Australia's national gemstone. For Mr Dunstan that moment happened at age 14 back in 1965 when he found his first opal. "It's a lifestyle for ...

emerald, sapphire, turquoise, opal, ruby and yellow sapphire. The luxurious 14-karat SCRIBE brand “speaks” the coded gemstone language of acrostic jewelry, which uses the first letter of a ...