The Speed Brite Ionic Cleaning System is strong enough to clean metals but gentle enough for an opal.  The system is odorless and silent, which is perfect for cleaning pieces while your customer waits.  This machine is also safe for soft stones like emeralds or pearls. Using the Speed Brite is simple---clip your piece, drop it in the solution, and hit the button.  In less than a minute, your piece will be cleaned.  This machine is a 6 ounce system, but Stuller also carries a 12 and 32 ounce systems if you need to clean larger pieces, or larger quantities of pieces. Purchase the Speed Brite today at Stuller.com/tools.