Peel and segment the oranges, ensuring that no pits, pith or skin remain. Put the segments in a glass dish and set aside. In a small saucepan, bring the sugar and water gently to the boil, stirring occasionally. Boil for 15 minutes, until it is the consistency of a thin syrup. Add the rosewater and stir to blend. Pour the syrup over the orange segments and chill until required.