A 2000-year-old ring with a solitaire gem stone was uncovered recently in archaeological excavations in the City of David National Park in Jerusalem. It was found in a mikvah (ritual bath) on the Pilgrimage Road that dates to the time of the second Temple period.

http://www.jewishpress.com/news/israel/jerusalem/two-thousand-year-old-ring-unearthed-in-the-city-of-david/2018/12/23/