On a cord around his neck, Turkish jeweler Gurhan Orhan sports a well-worn Sumerian jasper pendant carved with cuneiform symbols, an early form of writing that dates to around 3500 BC. Although he has ...

When a prominent Munich art collector commissioned Stefan Hemmerle to create a diamond ring for his wife in 1995, he set one condition: no flashy settings. His wife, he said, detested them. To meet ...