By Dr Oliver Tearle (Loughborough University)
Diamonds have long been regarded as the most precious of all of the precious gemstones. For this reason, diamonds often symbolise perfection, purity, and rarity; however, because of the durability of diamond – it is famously capable of cutting glass – diamonds also sometimes symbolise imperviousness and indestructibility. The word adamant, used of someone who is unwavering and committed, is from an Old French word meaning ‘diamond’.