The Ruby Violet mine, owned by Gemstone Mining, produces 5,000 to 7,000 carats a year. "Gemstone mining map" was originally created and published by Mining Technology, a GlobalData owned brand.

The man behind what could be NZ's capital of gemstone collecting (9 min 25 sec) "The ancient volcanoes going way back the head of the Rangitata, the Hinds, the Ashburton, Mount Somers ...