Hi Jodie,
Cutting silver with a metal cutting laser is indeed possible (I do it daily) however it requires a Yag or Fibre Laser and not one of the cheaper CO2 lasers such as come out of China or companies like Trotec,Uls or Epilog.
You will need somewhere about 500 watts as a decent start point to cut cleanly however you can go down as low as 100 watts and still get passable results.
In my spare time I run a forum for laser cutting for people to learn and post about any problems. (it's totally free,there are no adverts or spammy rubbish on there) if you want to message me direct I'm happy to give you the url?
best wishes
Dave