"Quality gems" refers to gemstones that are of high or excellent quality. These gems have desirable characteristics such as clarity, cut, color, and carat weight, making them valuable and sought after. Full definition
There is a saying in the gem mining industry, that you have to move 10,000 pounds of rocks to find one good quality gem. (beyondblackwhite.com)
You can combine lesser quality gems, producing higher quality ones. (buttonmashing.com)
One of these, Perth - based Majestic Resoures NL, has contracted to market 10,000 carats of high quality gems worth between $ 3 million and $ 9 million annually for the Angolan government. (businessnews.com.au)