Abstract: A viewing device is configured to magnify and view a marking on a gemstone. The viewing device includes a light source, a mask, a magnifying optical device, and a camera. The light source generates light directed along a first path towards the gemstone. The mask partially obscures the light from the light source to generate a pattern. The partially obscured light is reflected off of the gemstone and magnified by the magnifying optical device. The camera is positioned to capture the magnified light. One or more additional light sources generate light directed along a second path towards the gemstone. The light enters the gemstone through a preferred facet and internally reflects. Internally reflected light scatters off of an internal mark in the gemstone and exits the gemstone through the gemstone's top face. The reflected and scattered light is magnified by the magnifying optical device and captured by the camera.

Abstract: A viewing device is configured to magnify and view a marking on a gemstone. The viewing device includes a light source, a mask, a magnifying optical device, and a camera. The light source generates light directed along a first path towards the gemstone. The mask partially obscures the light from the light source to generate a pattern. The partially obscured light is reflected off of the gemstone and magnified by the magnifying optical device. The camera is positioned to capture the magnified light. One or more additional light sources generate light directed along a second path towards the gemstone. The light enters the gemstone through a preferred facet and internally reflects. Internally reflected light scatters off of an internal mark in the gemstone and exits the gemstone through the gemstone's top face. The reflected and scattered light is magnified by the magnifying optical device and captured by the camera.

Abstract: A method of producing a photo-voltaic device comprising the steps of: synthesising carbon nanotubes; adapting the synthesised carbon nanotubes to provide a surface defect such as to create an effective band gap; selecting an organic semiconductor material which facilitates the efficient energy transfer between carbon nanotubes and the organic material, wherein the organic material is selected such that the energy band gap formed between the HOMO and LUMO energy levels lies within the effective band gap of the adapted carbon nanotubes; combining the adapted carbon nanotubes and the selected organic material to form a composite material.