A complex usually comprising two gamma-tubulin molecules and two conserved non-tubulin proteins. Some gamma-tubulin small complexes are thought to be the repeating unit making up the core of the gamma-tubulin ring complex. [ http://www.ncbi.nlm.nih.gov/pubmed/12134075 http://www.ncbi.nlm.nih.gov/pubmed/11297925 ]