Scrub the crystal to remove set in clay. You will have to do several rounds of cleaning, allowing the crystals to dry in between rounds. Once the crystal is dry, the clay cracks and becomes easier to remove. If clay is particularly stuck on, try spraying the crystals down with a hose with the nozzle set at maximum force. As with using a toothbrush, you will have to do this several times a day, allowing the crystals to dry in between sessions.
Submerge the crystals in enough full-strength vinegar to cover all the crystals. Leave the crystals for 8 to 12 hours. Remove the crystals from the vinegar. Soak them in washing ammonium for an equal amount of time. Then, remove the crystals from the ammonium, rinse them completely, and wipe them dry. You may have to repeat this process several times if the stains persist after the crystals are first soaked.
Lubricate the crystal with a light layer of mineral oil before you begin. There is no need to saw the crystal or press down on the saw. You simply need to place the crystal under the saw and allow the machine to gradually saw through the crystal. Trim away any unwanted portions of the crystal. There may be areas with stains that would not come out, for example, which you should remove with the saw.
Use a combination of warm water and laundry detergent to wash the crystals. You can use a soft rag to scrub any dirt and debris that comes off easily. From here, find a container you can cover easily, like a sturdy Tupperware container. Fill this container with warm water and 1/4 cup of bleach. Place the gems in the bleach, cover the container, and set aside in a safe place for two days.
Fill the container three fourths of the way full with distilled water. Then, pour in the oxalic acid. Wear an air mask to avoid inhaling the acid. You also want to make sure you work outside. Stir the acid, using a large rod or spoon, until the oxalic acid crystals are dissolved. Add the crystal quartz. There is no set time to soak quartz in oxalic acid. Depending on the staining, it can take a few days to a few hours. Check the quartz periodically and remove them when the stains are gone.
Wear eye protection, gloves, and a face mask when handling oxalic acid. Always pour acid into water. It is very dangerous to pour water into acid. Get a friend or family member to help you. Make sure to protect your work area and go slowly to avoid spills. Baking soda can neutralize acid spills, so have some baking soda on-hand.
50 grade sandpaper 150 grade sandpaper 300 to 600 grade sandpaper
Make sure you go for consistency. You do not want any portions of the gem to be more or less sanded than others.
Once again, rub the stone gently through its entire surface. Make sure to smooth away any blemishes or discolorations on the stone. When you’re done, your crystal should like bright, clear, and shiny.
