Diamond enhancements are specific treatments, performed on natural diamonds (usually those already cut and polished into gems), which are designed to improve the visual gemological characteristics of the diamond in one or more ways.
Mandarin is the language of instruction of China and Taiwan. Mandarin is one of five major regional languages of China. It spreads wider than any other regional language, from the whole northern part of China down to Yunnan Province in the southwest corner of China.
Mandarin Chinese is a tonal language, which means that different tones can change the meaning of a word, even if the pronunciation and spelling are otherwise the same. It is essential to learn the different tones if you wish to speak Mandarin Chinese correctly.