Putting a gemstone that shouldn't be cleaned in an ultrasonic or steam cleaner in one could spell disaster. Unsure? Reference this handy chart to decide when to clean with the machines and when to steer clear:
| Gemstone | Ultrasonic | Steam Cleaner |
|---|---|---|
 Amethyst |
Usually Safe | Risky |
 Aquamarine |
Usually Safe | Usually Safe |
 Bead, Hematite |
Safe | Safe |
 Bead, Malachite |
Never | Never |
 Blood Stone |
Usually Safe | Usually Safe |
  Blue/Red Star |
Usually Safe | Usually Safe |
  Cameo |
Risky | Risky |
 Carnelian |
Usually Safe | Usually Safe |
 Emerald (All) |
Never | Never |
 Alexandrite |
Usually Safe | Usually Safe |
 Ruby (All) |
Usually Safe | Usually Safe |
 Sapphire (All) |
Usually Safe | Usually Safe |
 Citrine |
Usually Safe | Risky |
 Coral |
Risky | Risky |
 Diamond/CZ |
Safe | Safe |
 Zircon, Blue |
Risky | Risky |
 Tiger Eye |
Usually Safe | Risky |
| Gemstone | Ultrasonic | Steam Cleaner |
|---|---|---|
 Foilbacks |
Never | Risky |
 Garnets (All) |
Usually Safe | Never |
 Iolite |
Risky | Risky |
 Jade |
Safe | Safe |
 Lapis |
Risky | Never |
 Marcasite |
Safe | Safe |
 Masonic (All) |
Usually Safe | Usually Safe |
 Moonstone/Pearl |
Never | Never |
 Onyx |
Safe | Safe |
 Opal (All) |
Never | Never |
 Peridot |
Risky | Never |
  Quartz (All) |
Usually Safe | Risky |
 Tanzanite |
Never | Never |
 Topaz (All) |
Never | Never |
 Tourmaline (All) |
Risky | Risky |
 Turquoise |
Never | Never |
 BlackStarSapphire |
Risky | Risky |