Add the pears, cranberries and pomegranate arils to the bottom of a pitcher. Add all of the ingredients together and stir. Refrigerate for an hour or so (or longer!) before serving.
Coat the rim of a chilled wine glass with an orange slice. Stir together the sugars and cinnamon and pour it on to a plate. Coat the rim with the cinnamon sugar, pressing gently to adhere. Pour the sangria and serve!