Cobalt Blue Spinel
An electric, inner-lit blue caused by traces of cobalt — found in meaningful quantity nowhere else on Earth. The deposits cluster around An Phu commune, twenty minutes from our market. Even a serious strike breaks into small layered pieces, which is why a clean stone above a carat is an event.
Full story and prices in our Cobalt Spinel Guide, the Spinel Guide and the Luc Yen Origin Guide.