Mysterious "halos" of rock surrounding cracks in a Martian crater may be made of water-rich opal gemstones, a new study suggests. When you purchase through links on our site, we may earn an ...

Opals are examples of natural photonic crystals. They are composed of small silica nanoparticles ranging in size from 50-300nm, and packed tightly together in a semi-regular "lattice" Breaking Taps ...

The gemstone is known for its "play-of-color," or ability to shift hues. Rough opals appear white, but once polished, their surface shines a rainbow kaleidoscope. Opals can be found across the ...

Opal is a gemstone used in a variety of crafting recipes in RuneScape: Dragonwilds, including the Crystal Bow, a Masterwork weapon. You must unlock the ability to mine Opals first, though ...

This gemstone is well-known for its "play-of-color," or ability to shift hues. Rough opals appear white, but when polished, they show a rainbow kaleidoscope on their surface. Opals can be found ...

has returned with its newest footwear offering: an opal gemstone-filled hiking boot made in collaboration with Italian footwear purveyor Diemme. The head-turning model boasts a fuzzy suede upper ...