While it is seldom disclosed by coffee roasters to consumers, it is possible for small rocks to make their way into roasted coffee.  When coffee is processed at origin, it is common for rocks, sticks, and other debris to be commingled into the harvested coffee like many other agriculture crops.  Most of the debris is sorted out during the processing prior to being imported into the United States, but not all.  It is not uncommon for coffee roasters to find rocks in bags of green coffee that are similar in size, color, and weight to the coffee beans/seeds.  At Ketch Coffee Roasters we take three steps to prevent stones from making their way into your roasted coffee and potentially into your coffee grinders: 1) We visually sort the green coffee prior to roasting for defects and debris; 2)  We use a mechanical device called a destoner to separate stones from the roasted coffee; and 3) We do a final manual inspection of the roasted coffee.  While it is extremely unlikely that you will ever find a stone in your roasted coffee, we strongly recommend that you take a moment prior to grinding your roasted coffee to look for small stones as they are very hard on the burrs of your grinder.