smoke-free home. beautiful blue topaz pendant with a diamond on top. never wore as I couldn't find a chain that I liked for it. listed a topaz ring that would go beautiful with us. please buy with confidence as Posh authenticates anything over $500. just thinning out my jewelry a bit. I took it to my local jeweler and he said the topaz is 18 carats and it is set in 14 karat yellow gold and the diamond weight is .10 ctw