"a treasure of Chinese civilization" 或 "a gem of Chinese civilization"
这两个表达都强调中华文明中珍贵、杰出的文化或历史遗产。具体使用场景略有差异：
The Terracotta Warriors are regarded as a treasure of Chinese civilization.
Chinese calligraphy is a gem of Chinese civilization.
如果指代复数（多种瑰宝），可用：
"treasures/gems of Chinese civilization"
拓展相关表达：
根据语境选择合适的词汇即可，希望对你有所帮助！