1. What is Chavelet?

Mineral name: Cr-V-Ca-Al garnet.

Chemical composition: calcium and aluminum (silica).

Specific gravity: 3.6 1.

Mohs hardness: 7.25-7.5.

Crystal structure: cubic system.

Refractive index: 1.74.

Deviation: 0.028.

The chemical name of shafei stone is Cr-V-Ca-Al garnet, which is delicate and green and pleasing to the eye because of its small amount of chromium and vanadium. In the late 1960s, geologist Campbell bridges discovered it in Kenyan Shafo National Park. 1967, he brought the gem to new york. In the early 1970s, Tiffany &; Co.) named this gem "Sapphire Stone" and introduced it to the world.

Second, the origin of Chavelle

Savli is a specialty in Canada, Sri Lanka, Pakistan, the former Soviet Union, Tanzania, South Africa and the United States.

Third, the color of Chavelle.

The first thing to look at is whether the color of Chavelet is attractive. The colors of Savorite range from light green to dark green. Yellow and earthy yellow tones will reduce the value of gems, while blue tones will increase the value of gems. The best color is rich blue-green close to emerald, followed by bright emerald. The "yellow tone" will reduce the gem value of Chavelle, while the "blue tone" will increase the value.

The most important factor in determining the price is color. In Chavelet, green is easy to yellow, while blue is rare, and color concentration is also one of the important indicators. The light concentration can be green at most. If the concentration is too deep, it will turn into dark green, and the value coefficient will also decrease.

Fourth, Chavelle's three highs.

1. High brightness

The fire color of Chavelet is very good, because the back of the gem crystal has a good refractive index, which makes the backfire on the gem surface beautiful and dazzling under the light source.

2. High definition

One of the major characteristics of Chavelet is that it is relatively pure inside and has few impurities, which is the biggest difference between it and emerald in appearance.

3. High saturation

Chavelet's color is charming and moving, and the high saturation tone is pleasing to the eye.

Verb (abbreviation of verb) Chaweilai's value

Natural shaftestone is excellent in color, not selective in transparency and luster, full of fire color, 200 times harder than emerald, and less in internal impurities; Excellent quality, less inventory and very high natural price.

High brightness, high purity and high color saturation are the admirable "three highs" of Sappho Park Jung Su, whom many colored gems envy and hate. At the same time, the saffron stone also gained a lot in the auction.

Rarity is always the golden rule of high price of precious stones. The mining of Sha Fei stone is very difficult, which requires us to be familiar with the geological structure and move quickly, because Sha Fei stone appears in rock cracks, which often disappear suddenly during the mining process. Only by breaking these stones can we see beautiful green.

Sixth, the main points of purchasing Chavelet.

1, color: yellow tone will reduce the value of the gem, blue tone will increase the value, high-quality color is solved by rich blue-green emeralds, followed by bright emeralds.

2. Cleanliness: Most Shafo dishes are very transparent and clean.

3. Cutting: Emerald cutting can show the color of Shafulai to the maximum, while rounded and bright can show the brightness and fire color of Chavelai to the maximum.

4. Weight: generally small. It is rare to see high-quality products above 3 carats. If it exceeds 10 carat, it reaches the collection level.