Flint
 An emerald is as green as grass, A ruby red as blood; A sapphire shines as blue as heaven; A flint lies in the mud. A diamond is a brilliant stone, To catch the world’s desire; An opal holds a fiery spark; But a flint holds fire.

The Face of the Deep. Learning Not to be First: A Biography of Christina Rossetti. London: Anthem 2004.

Christina Georgina Rossetti (5 December 1830 – 29 December 1894) was an English poet who wrote a variety of romantic devotional and children's poems. She is perhaps best known for her long poem Goblin Market her love poem Remember and for the words of the Christmas carol In the Bleak Midwinter.