Birthstone for October. Tourmaline is the modern birthstone for October.. The gem comes in a range of colors, such as pink, red, green, blue, violet and black. This is fitting since tourmaline's ...

The gemstone is known for its "play-of-color," or ability to shift hues.Rough opals appear white, but once polished, their surface shines a rainbow kaleidoscope.. Opals can be found across the ...

Two mysterious polished stone balls thought to date back more than 5,500 years have been discovered in a tomb on Sanday, in Scotland's Orkney Islands.. These rare finds were unearthed at the ...

Archaeologists excavating a tomb at one of Scotland’s oldest known monuments have discovered two polished, 5,500-year-old stone balls, reports Alison Campsie for the Scotsman.