Crystal quality identification 5, crystal quality identification

Engraving: The hardness of the crystal is 7 degrees on the Mohs scale, and the glass is only 5 5 degrees, so the edge and corner of the measured object are used to carve the glass and the obvious traces can be carved for the crystal.

Tongue licking: Touching the analyte with the tip of the tongue, the crystal will give a cold feeling due to its high thermal conductivity, and the glass will feel warm.

Hand weight: The specific gravity of the crystal is larger, so it can be weighed by hand than the glass of the same volume, such as weighing with a balance is better.

Visual inspection: If it is a crystal ball, you can put a hair on a white paper, press the hair with the sphere, look at the eyes from top to bottom, slowly rotate the sphere, and when it reaches a certain angle, the birefringence of the crystal can make people see that a hair becomes two.

Crystals can usually be divided into two categories, one is crystals, and the other is microparticle crystals, often referred to as crystals. Generally refers to crystalline crystal, which can be roughly divided into the following types. (1) White crystal:

The purest crystal is transparent white crystal, which is often used for jewelry. (2) Citrine: Citrine is one of the cheapest of all yellow gemstones.

Among them, the slightly orange-red one, although the value is higher, is not a natural citrine, but is formed by heat treatment of poor-quality amethyst. (3) Brown citrine: often known as citrine, generally used to make glasses.

Its color can be dark and light. (4) Amethyst: The value is higher than that of ordinary crystal.

Good quality amethyst is mostly cut into round, square and long facets. When identifying the quality of crystal, it mainly depends on whether the color is good, whether the color is uniform, and whether there are impurities in the stone.

1. See: In the process of formation, natural crystal is often affected by the environment and always contains some impurities, and when observing the sun, you can see a faint uniform fine horizontal stripe or catkins. However, fake crystals are mostly smelted with residual crystal ballast and glass ballast, which are polished and colored, and there are no uniform stripes and catkins.

2. Tongue licking: Even in the hot summer, licking the surface of natural crystal with your tongue will have a cold and cool feeling. Fake crystals, on the other hand, do not have a cool feeling.

3. Light: Natural crystal is placed vertically in the sun, no matter which angle you look at, it can emit beautiful brilliance. Fake crystals cannot.

4. Hardness: natural crystal has high hardness, and it will not leave traces if you scratch it lightly on the jewelry with gravel; If there are streaks, it is a fake crystal.

5. Check with a polarizer: a natural crystal that rotates 360 degrees under the polarizer and has a seemingly bright and dark change, and a fake crystal that does not change.

6. Check with dicolor: natural amethyst has dichroism, while fake crystal has no dichroism.

7. Check with a magnifying glass: Check with a 10x magnifying glass under transmitted light, and the bubbles that can be found can basically be determined as fake crystals.

8. Check with a hair strand: put the crystal on a hair strand, if the human eye can see the double shadow of the hair through the crystal, it is a natural crystal, because the crystal has birefringence.

9. Detection with thermal conductivity meter: adjust the thermal conductivity meter to 4 grids of green to test gemstones, natural crystals can rise to 2 grids of yellow, while false crystals do not rise, and rise to 1 grid of yellow when the area is large.