At present, high-precision electronic balance is more used to measure density. Hydrostatic method (density method) is used.

The density of jadeite is 3.34g/

cubic centimeter

(

+

0.06

,

-

0.09)

,

Density is an important index that distinguishes jadeite from other jadeites of the same kind.

Furthermore, a method for measuring the density of a liquid is provided.

1、

Measurement of density (specific gravity) by heavy liquid method

"Specific gravity" refers to the ratio of the weight of a gem to the same volume of water. For example, 1cm3.

The weight of water is 1.

G, 1cm3 nephrite weighs 3.0.

g，

Nephrite has a specific gravity of 3. In order to express it more scientifically,

Introducing the concept of density into jewelry science,

Density refers to the mass per unit volume (commonly known as weight)

. In jewelry testing, under normal circumstances, we regard the specific gravity and density of gems as equal. Both units are the same, that is, g/

cubic centimeter

In order to identify precious stones, it is usually not necessary to measure their exact density (or specific gravity)

As long as you know the density (or treatment)

In which range is enough. The density of jadeite is 3.34g/

cubic centimeter

And similar jades such as nephrite, dushan jade, jadeite and quartzite jade (such as "Ma Laiyu").

Their densities are all below 3. 1g/

cubic centimeter

The densities of garnet, hydrogrossular, Fushan stone and sodalite are all higher than 3.34g/cm3.

. Therefore, in order to distinguish jadeite from similar jadeite, it is only necessary to measure their density greater than 3.34.

, or less than 3. 1.

Do it.

Heavy liquids are liquids with high specific gravity,

In the identification of jadeite, there are two common heavy liquids:

Diiodomethane, yellow liquid: specific gravity 3.33g/

cubic centimeter

Tribromomethane, yellow liquid, specific gravity 2.9g/

cubic centimeter

In the appraisal work,

Identification of jadeite by diiodomethane;

Putting jade into heavy liquid,

Those whose specific gravity is greater than that of heavy liquids will sink,

A liquid with a specific gravity less than that of a heavy liquid will float,

Jade whose specific gravity is completely equal to or very close to heavy liquid,

It is still up in the air. Therefore, jadeite jade pieces are suspended in diiodomethane, Ma Laiyu (dyed quartzite).

Nephrite and jade float on the liquid, while dense jade such as almandine and Fushan jade sinks rapidly.