This "small square" should be a piece of jade, which is a general term. Generally, we distinguish jade by its hardness, which can be simply divided into three types: gem, emerald and colored stone. Generally speaking, the Mohs hardness of gemstones is above 7, such as diamonds, rubies, sapphires and jadeites, but Opal gemstones are an exception, with Mohs hardness of 5.5; The Mohs hardness of high hardness jade is between 6 and 7.5, such as Hetian jade, Nanyang jade and jadeite. The hardness of low-hardness jade is 4-6, such as turquoise and jadeite (the hardness of some serpentine jade is lower, as low as 2.5). The minerals below 4 are generally not called jade, but called colored stones. This article looks terrible and should be used by ordinary people. And strictly speaking, it may be a colored stone or a jade with poor quality.

Second, the inscription is "Peace". Obviously, the font is Xiao Zhuan, also known as Qin Zhuan, or the famous jade seal, so it gets its name from its meaning of "healthy pen". Xiao Zhuan's strokes are smooth, neat and beautiful. Although Xiao Zhuan was created by Li Si, the prime minister of Qin Dynasty, it has a long history, but there are many masters of Xiao Zhuan calligraphy in later generations, such as Li, a calligrapher in Tang Dynasty. Although this inscription has the charm of Xiao Zhuan, it has no signature and no source, and its brushwork is tense. It should be the work of ordinary Xiao Zhuan calligraphy lovers.

Third, it is used as an amulet. It should be tied with a string and hung around the neck, waist and Elsholtzia.