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.

Chopard’s New L.U.C Full Strike Sapphire Is a Crystal-Clear Watchmaking Marvel Its sapphire crystal gongs and case produce a strike four times louder than a repeater with steel gongs. Published ...

Since it debuted the iPhone 5S in 2013, Apple has claimed that its camera lens is made of a synthetically produced material called sapphire crystal. Because it's so hard, it's almost impossible to ...