Crown jewels: The fabulous rings which sealed the love of Europe's royal couples

Four years on and there was another beautiful brunette embarking on life as a Danish princess. Frederik's romantic younger brother, Prince Joachim, asked his French girlfriend Marie Cavallier to marry him with a truly thoughtful token of his love.

The ruby, diamond and sapphire tricolour ring was chosen by the groom to reflect the colours of Princess Marie's homeland's flag in a nod to her heritage