Diamond, the hardest substance found in nature, was known to the ancient Greeks. They called the gemstone
adamas, using the same word they used for any unbreakable or indestructible substance, such as the hardest metal, or for anything unmovable. They spelled the stem of this word
adamant-. Later, Latin writers borrowed these Greek words, sometimes spelling them
adamant-, adamas and sometimes
adimant-, adimas. The spellings
adamant-, adamas in time gave us the English noun
adamant, meaning
"an imaginary stone of great hardness", and the adjective
adamant, meaning
"firmly fixed or decided". The "i" spellings in Latin were later changed from
adimant-, adimas to
diamant-, diamas and came to be used only for the gemstone which we now call diamond.
(courtesy of Merriam-Webster)
Though really, it just means that I like Pippin and would marry him if I could.
(and 18 was how old I was when I signed up)