The purpose of this work is to explore the principles of colour theory and practical application of colour theory to jewellery design, using coloured gemstones as source of colour and a tool for expressing artistic vision, rather than being source of value in its traditional understanding. The goal of my thesis is to explore the colour studies in the context of jewellery, practice colour use according to the principle of visual colour mixing, examples of which can be found in great works of Neo Impressionists; and apply the principles to the fine jewellery pieces that will be made using traditional jewellery making techniques.