For Monica Rich Kosann, whose high jewelry collection, The Jewels of Nature, uses rare Australian black and crystal opals and ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Opals may have been around for thousands of years, but they’re having a major resurgence in the ...

Some watches scratch easily or lose accuracy, but true durability is built to last. From rugged tool watches to vintage chronographs and military-grade timepieces, these are made for adventure. They ...