Glass-Type Jadeite: Texture, Translucency & Volume
In jadeite, glass-type describes a material character associated with exceptionally fine texture and high translucency. It is a traditional trade and connoisseurship description rather than a standardized laboratory grade.
A cabochon must also be considered in three dimensions. At 18.4 × 16.5 × 9.6 mm, this stone retains substantial depth relative to its face-up dimensions. That volume matters because thickness and curvature influence how light enters, travels through and returns from the material.
For this reason, apparent size should never be considered in isolation. A considered assessment looks at the relationship between texture, translucency, thickness, curvature, polish, proportion and overall material integrity.
On the Term “Laokeng”
In traditional Chinese jadeite terminology, laokeng (老坑) is a historical trade and connoisseurship expression associated with jadeite admired for fine texture and mature material quality.
It should not be understood as a modern laboratory grade, nor should the term alone determine quality. Feiyuehui therefore evaluates the stone itself — its texture, translucency, proportions, volume, polish and overall integrity — rather than relying on terminology alone.
Form & Volume
A jadeite cabochon is not judged by face-up dimensions alone.
Thickness and curvature determine how much material is preserved and influence the visual relationship between translucency, depth and light. A thinner stone may appear large from the front while containing considerably less material volume.
The 9.6 mm depth of this cabochon is therefore not merely a measurement. It forms part of the stone’s three-dimensional presence and must be considered together with its 18.4 × 16.5 mm face-up dimensions.