Deb nomlangan "opal tosh" in gemology refers specifically to golden emeralds with cat's eye effect. Any other gem mineral with cat's eye effect cannot be called "opal tosh" umuman, lekin uning nomi oldida bo'lishi kerak. Bu mineral nomlar beriladi, kabi "emerald cat's eye" yoki "kvarts mushukning ko'zi". The chemical composition [...]
