Through my job and home studio, these are the folks I have used for
RP services. I work in Rhino too, so these places are very
comfortable with Rhino. There are many more out there that I have
not come across yet, so dig around.
I have had good luck with MS Systems in New Britian CT. I think they
do alot of work with jewelers.
Also CadBlu in NJ adn NY. They also do alot of jewelry models.
And quickparts. Very nice people, easy to work with.
Here is an online list of Service Bureau companies for RP
Most of these places will send samples.