I spotted this paving stone on Grand Avenue in Hove. T'internet informs me that this was made by the Adamant Stone & Paving Co of Aberdeen. According to The Maven's Word of the Day:
"Adamant comes ultimately from Greek adamas which was first an adjective meaning 'invincible' -- it came from the verb damao meaning 'to tame or conquer' -- and then became a noun meaning 'the hardest metal' or 'anything firm and unyielding'. It was also applied to the hardest gem known to the ancient world. The Latin adamas had the same meanings as the Greek word and was eventually transferred to the diamond (which is a variation of "adamant"). "
I remember being at primary school one day doing a reading test, and next in the list of words my teacher was getting me to read to her was 'adamant'. I thought it was a trick question - what was the name of that bloke on Top of the Pops with the white stripe across his nose doing in my reading test?!