The world of products, as jewels, perfums, foods or automobiles, doesn´t escape of a continuous renovation and anticipation necessity. Trends forecast while observing of the society and its economic-political- cultural context becomes essential for design in the products development. This dissertation considers the construction of a theoretical fundamentation for the fashion and design trends conceptualization, the forecaster´s performance, the trends forecasts practice and its relevance in design strategical orientation. It also presents the importance of design inside the strategical management of the companies and some initiatives that had contributed to the consolidation of the brazilian jewellery design and its paradigms changes, as the impact of industrialization, the symbolic content valuation in the jewels conception and consumption, the approach of jewels and fashion and the strengthening of art´s jewellery. Finally, presents the brazilian Jewellery Trendsbook contribution for the update and success of brazilian jewellery design in the World.