浑金璞玉

Explanation: Parable quality of natural beauty, unadorned. Many people used to describe the quality of simple goodness. 　　Usage: Joint type; as object; analogy unadorned natural beauty of quality 　　Source: Southern Liang Yuandi "Hou Kai Shek Mun recommended for the Orient House": "some paint creamy, something more than Wei Jie; muddy gold diamonds in the rough, only horses Shan Tao." 　　Examples: Following the extraordinary special effect of Ganoderma lucidum, ~ the device good. (Clear s "The same year, another Lai Yunzhi" Poetry) Thesaurus:  Hun Kim white jade, Unadorned beauty