The knowledge graph is algorithmically based. There isn't anything specific you can do to have it show up.
I think that you can increase the chances that the Local Knowledge Graph shows up if you ensure you have a good local seo foundation: quality citations, reviews...etc. Basically, give Google a reason to display it.
Linking your website to your Local G+ page can help as well (publisher mark-up)
New advertising option:
A review of your product or service posted by a Sterling Sky employee. This will also be shared on the Sterling Sky & LSF Twitter accounts, our Facebook group, LinkedIn, and both newsletters.