What is the difference between lustre and luster in terms of their appearance and characteristics?

Lustre and luster are two spellings of the same Word, with "lustre" being the British English spelling and "luster" being the American English spelling. In terms of appearance and characteristics, both Words refer to a shiny or reflective quality, typically seen in materials like metals or gemstones. The difference lies only in the spelling, with no distinction in meaning.