We have minimal experience with actual 3D printing. We do have experience of making a highly detailed and precise 3D model for 'printing' a gold ring. The printing part was not to print the actual gold ring, but the shape to make a mould, into which pour the gold for the ring. Yes, it's quite an intensive operation. But with a good workflow, it could probably be a lucrative route to make gold jewelry.
The process could be something like this:-
On the right are some of the images of modeling process we went through. It was a learning curve.
Our modeling services can make, or adapt, an existing model for use in the 3D printing environment.
And it doesn't have to be for jewelery!