Topacia is a word that is not commonly used and its spelling might be confusing. However, its pronunciation can be easily explained by using the International Phonetic Alphabet (IPA). The correct spelling is /təʊˈpeɪʃə/, with the letter 'o' pronounced as in the word 'toe', the stress on the second syllable, and the final sound represented by the cluster 'sh'. This transcription clarifies the correct pronunciation and helps prevent confusion with similar words.