Emerald is a precious gemstone and a variety of the mineral beryl colored green by trace amounts of chromium and sometimes vanadium.

Simply print, check the scale and measure. If you can't be measured by a jeweler, or you want to keep a ring purchase a surprise, this is the tool you need.

These three types of opal are all very different from one another.  It wasn't until recently that we understood how each differed from one another, and from traditional opals.

"It was the style of the flapper girl and the factory, the…