A lighting device mounted within a jewelry setting which is directed at a facet of a gemstone to increase the brilliance and brightness of the gemstone. The lighting means is a low dispersion, focused beam of light which is directed at a facet of a gemstone so that the gemstone captures the light. In...http://www.google.com.au/patents/US5117338?utm_source=gb-gplus-sharePatent US5117338 - Jewelry lighting device
