LinkedIn has a built in method for allowing one business professional to recommend the services of another. Each profile includes a "Recommend" link below each listing in the Experience and Education section.
You need to build some recommendations. This will validate your work and create an instant reputation for potential customers that have discovered your profile. Just like reviews on Google Places, the reviews here have a long term value.
But you don't have to wait for people to give you a review. In fact, if you don't ask for reviews you will probably never get them. Once you've established a few dozen connections you should wait before soliciting recommendations from people. You simply do not want to create a connection and then request a recommendation in the same day, or even the same week. That's just rude and the reasons behind your actions will be completely transparent to the business professional.
So, after some time, you should log into your account and hover over the Profile from the top menu, and click on Recommendations in the drop down menu options.
This brings you to the Received Recommendations tab. Your jobs should all be listed on this page with links that say [ Ask to be endorsed ].
Click that endorsement line and follow the directions on the next screen. You will have the ability to request endorsements from more than 1 connection at a time. You are able to send customized messages in the endorsement request. The best technique is to personalize every request, but if you don't have time for that then select groups of customers that might have purchased the same type of jewelry and customize a message based on their general purchase.
You should also request recommendations from your friends and business contacts. You can send those requests as groups too, but you won't be able to customize the messages easily if you commingle customers, friends and business contacts in the same request.
That's all it takes. Within a few days you should have a nice list of recommendations.