| Quality Factor | Category / Level | Detailed Explanation |
|---|---|---|
| Transparency (Diaphaneity) | Semi-Transparent to Transparent / Glassy / Glass-variety / Bo Li Zhong Jadeite | The highest level; almost perfectly transparent with a glass-like luster. Light passes through completely; Objects or text behind the jade can be seen with absolute clarity. |
| Translucent / Icy | Light passes through, but objects behind the jade appear blurry or indistinct. Translucent and clear, resembling a block of ice. Highly sought after. | |
| Semi-translucent / Glutinous (Sticky) / Nuo Bing | Light partially penetrates, and you can clearly see the interior of the jade being "illuminated" or a flashlight beam cutting through a portion of it. However, you cannot outline or see any objects behind it. Semi-translucent with a fine texture similar to cooked rice soup. In the industry, Nuo Bing, is characteristic of premium nephrite. | |
| Sub-translucent / Nuo-variety | Light penetrates only slightly, typically visible only along very thin edges. | |
| Opaque | Light cannot penetrate at all. Generally considered lower quality. | |
| Colour | Hue | Refers to the basic color (e.g., Green, Lavender, Red). Vibrant "Imperial Green" is most valuable. |
| Saturation | The intensity or richness of the color. High saturation without being too dark is ideal. | |
| Tone | The lightness or darkness of the color. Evenness of tone is a critical value factor. | |
| Texture | Extremely Fine Grained / Glass Variety | It features an extremely fine, cryptocrystalline structure. The mineral grains are so microscopic that they cannot be resolved even under high magnification, resulting in a completely seamless and flawless texture. |
| Fine Grained / Icy Variety | Its internal mineral crystals are extremely fine-grained and completely invisible to the naked eye, forming a dense and tightly interlocking structure that perfectly mimics the look of natural, frozen ice. | |
| Medium Grained / Nuo/Sticky Rice Variety / Fine Pea Variety | Nuo variety jadeite is characterized by a medium-grained, granular-fibrous texture, which creates a hazy, translucent to sub-translucent appearance resembling sticky rice soup. It is highly valued for its smooth, greasy luster and excellent toughness. | |
| Coarse Grained / Pea Variety | Visible crystalline structure; can appear "dry" and less valuable. A granular texture can cause the material to appear dry, as light reflects off the individual crystal faces rather than passing through smoothly. | |
| Cut (Workmanship) | Shape | Common shapes include Cabochons, Bangles, and Beads. Symmetry is key. |
| Carving | Evaluates the artistry, detail, and how well the carver utilized the stone's natural colors. | |
| Polish | A high-quality polish enhances the luster and highlights the stone's texture. | |
| Weight & Size | Carat Weight | Larger pieces of high-quality jadeite are exponentially rarer and more expensive. |
| Dimensions | For bangles and cabochons, thickness and diameter affect both durability and value. |
Reviewed by Nina Na Su — Canadian Gemologist
Founder of Gemological Education & Services of Canada.
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