Resource Description Framework (RDF) is a modern graph database model which has a proposed extension called RDF*. However, currently there are no tools available that allow for transitions between RDF and RDF*. In this thesis tools were developed that allow for conversions between these two formats. A conversion tool for transforming RDF’s associated query language SPARQL into SPARQL* was also made. Furthermore, tools for converting between RDF* and another graph database model called Property Graph were developed. Measurements of the memory usage and conversion times for the developed conversion tools were made. Where possible, tests were also performed to control that there was no data loss in the conversions. The results showed varying memory usage and conversion times for the different conversions and that some conversions were very difficult to check for data corruption. Complex testing tools would be required to make sure all conversions are made correctly.