Heterogeneous aggregate generally refers to the test results of jade/jadeite. Jadeite minerals such as jadeite are called heterogeneous aggregates because of their different crystal sizes.

This is real jade.

The meaning of various results on the appraisal certificate:

1, A goods refer to natural jadeite whose internal structure has not been artificially processed. If it is a natural A-quality jadeite, the result is only "Jade", and the words "A-quality" and "Natural" will not be marked.

2. Impurities in natural jadeite are removed with B strong acid. If it is B-quality jadeite, the items in the certificate will be marked as "jadeite (treated)" or "jadeite (injected with glue)" or "jadeite (B-quality)" or "jadeite (optimized)".

3. The color of C goods is artificially dyed, and the jadeite of C goods will be marked with "Jade (Dyed)".

4. D Goods pass off as jadeite with other jade or glass. The word "Emerald" will not appear in the item of the appraisal certificate of goods D, and if there are substitutes, the names of substitutes will be indicated, such as "artificial glass", "dyed quartzite", "Xiuyu" and "Ma Laiyu".

Extended data

Taking jadeite as an example, jadeite is a heterogeneous aggregate composed of jadeite minerals, which is the basic parameter of jadeite certificate.

Refractive index:? 1.66 (this is the unique refractive index of jadeite that distinguishes it from other gems);

Density: 3.33 (which is also the feature that distinguishes jadeite from other gems);

Magnification detection:? Fiber interwoven structure (this is the unique structure of jadeite);

Absorption spectrum: 437nm absorption line (unique absorption spectrum of jadeite);

Color filter inspection:? No reaction (some dyed jadeite will turn red under the color filter);

Luminance: aggregate (jadeite is a kind of micro-mineral aggregate);

Fluorescence: None (some B goods will have fluorescence reaction after injecting glue);

Appearance characteristics:? Glass luster (some B goods will have waxy luster).

Old jadeite is generally uniform in crystallization, and some places have a fiber interwoven structure. However, because there is no national standard for jadeite, there is only the local standard in Yunnan Province, so the appraisal institution only needs to write the heterogeneous aggregate on it to explain that it is jadeite, and generally does not define the quality.

Reference source: Baidu Encyclopedia-Heterogeneous Aggregation