MYSTERY GEM: What colorless gem has recently found a second career as a diamond substitute?

When it comes to gems, all that glitters isn’t diamond. The need for low price-point diamond substitutes has led designers to leave no colorless stone unturned in their exhaustive search for diamond essence at clear quartz prices. Obviously, our mystery stone is not quartz. Neither is it zircon, which we have pitched for more than a year as an inexpensive natural diamond look-alike. So what is it? Well, here’s a generous, if not giveaway, clue. This gem was once found in the United States and may be found there again some day. Indeed, it owes its name to its American place of discovery.Colored Stone GemMail