bianca,
There are many threads on this forum about these oyster-opening parties. If you take the time to read up on the subject, you will understand why we discourage people from getting involved in any way.
Here is what happens. Freshwater mussels that have freshwater pearls in them are opened at factories. The pearls, which are of relatively low quality, are removed. Some are left their natural colors-- shades of peach and lavender, for example. Many pearls are bleached white. Other pearls are dyed black, peacock, blue, green and other colors.
Then these freshwater pearls are inserted into baby akoya (saltwater) oysters, which have thin fragile shells. The oyster is killed by immersing it in a harsh solution that forces it to slam its shell shut before it dies. The baby oysters are sealed in plastic with a chemical solution to preserve it from decaying; tests have been done on the packing solutions and some contain formaldehyde, which is dangerous to be in contact with. These oysters are sold to unsuspecting people who then open them-- generally with bare hands and no goggles, and often with children around who should not be exposed to the chemicals. Buyers are led to believe they are getting valuable akoya pearls. In fact they are grossly overpriced freshwater pearls. They are often sold with junky silver plated findings.
Do you want to be the person buying and reselling these low quality pearls? I hope not.