In a previous color, we’ve talked about what makes things colored — the way objects absorb, reflect, or transmit light at different wavelengths. But let’s be a bit more specific. What gives gemstones ...

Aluminum oxide (Al2O3), also known as alumina, corundum, sapphire, or ruby, is one of the best insulators used in a wide ...

Sapphire crystal, held up by analysts and industry watchers as a wonder material that's virtually indestructible, was a no-show as the display on the new iPhone 6. It's an anticlimactic end to ...

In the tests, the sapphire crystal on the Apple Watch Ultra had minor abrasions at levels 6 and 7, while the real damage starts at level 8. How it compares to other smartwatches.

Sub-micron period structures can be written into sapphire using a technique known as laser induced backside wet etching (LIBWE), say researchers in Greece and Germany. The approach could be useful ...

image: Ruby crystal grown on sapphire substrate at the Nagano engineering campus, Shinshu University. view more . ... Imagine having table salt, and wanting to form crystals of a desirable structure.