Kwei is one of the six ritual 
jades. Later on, kwei has developed into an instrument to measure time. Carved with green jade, this Qijia Cultural jade has the one-directional hole drilling style of Qijia jade. Antiquity evidence has differential weathering, dissolved pits, cleaving vein, and exposed crystal plane. (left image is Longshan Culture with 
the inscription of Qing Dynasty kwei, a collection of National Palace Museum.)
圭為六器之一, 本器綠玉雕琢, 上下兩端平直, 上端較寬, 平而薄, 下端柄部較厚, 外緣仍留有切割痕跡, 柄部有一孔, 單向鑽法. 古玉跡象有差異風化, 曝露晶面.《法曹圭臬》收錄椽吏故事，將椽吏分為審檢官、椽屬、獄官及律師四類，舉出書記、小吏等之仁德者、廉明者及貪酷者之善惡實例，使為小吏之人亦能體恤百姓之苦，而能夠以德愛人.
Appraisal Indexes:
- quality of jade: 8
- rareness: 9
- historical and cultural significance: 9
- workmanship: 9
- size:7
- condition: 10