Sphene is more often bought as loose stones by collectors ... rare gemstone that is usually found in shades of yellowish ...

owner of Korner Gem in Traverse City. “Iron ore from the U.P. had a high concentration of quartz. In Frankfort, it was particularly green.” So, the so-called “stones” are actually the ...

Only available from Myanmar and traditionally cherished in imperial China, where quality green gemstones were believed ... Myanmar remains the only source of gem-quality jadeite.

But in a high-level curling match, the stones are somewhat self-policing—thanks to the red and green lights atop each one. As long as the curler releases the stone before the front of it crosses ...