Carat (ct), usually abbreviated as Ct, is the international standard unit of measurement for precious stones.

The word "Kela" comes from the Greek word "Kela", which refers to carobseed, a plant widely spread from East Asia to the Middle East. Because its fruit is said to have almost the same weight, and the weight of diamond is the most easily measured feature in 4c, the early carob tree was used as the weight unit of jewelry and precious metals. One carat is equivalent to the weight of a small horn tree seed.

From 65438 to 0983, Mr. Tao of Chengdu Institute of Geology conducted a specific study, which confirmed that carat originated from the seed of carob tree in the Mediterranean region-rice bean. The weight of this tree is about 200mg, which has nothing to do with the weight of Robinia pseudoacacia, Pittosporum and Sophora japonica. It was not until the early 20th century that carat weight was standardized.

Step 2: Size

Carat (Ct) is the unit of mass (weight) of precious stones. Now 1 carat is equal to 0.2g or 200mg ... One carat is divided into 100 minute, such as 50 minutes or 0.5 carat.

Now 1 carat = 200mg = 0.2g. Klajo's 205.3mg is in the old gem book. If it is converted into the current carat, then one carat will be multiplied by 1.0265. This is only a rough description, because the carat value of different countries or regions in the old days is different.

Diamonds weighing less than 1 carat are usually measured in "points", 1 carat = 100 carat. On the certificate of diamond, the weight of diamond is accurate to the third decimal place.

IGI uses an electronic balance with an accuracy of 0.0000 1 carat to weigh the accurate weight of diamonds, and records it in the diamond appraisal report, accurate to two decimal places. So a 25 cent diamond weighs 0.25 carat. Diamonds of the same quality, the greater the weight, the more precious.

3: Price

The price of a diamond ring is calculated in carats. Now generally 0.2 carat sells for about 4000 yuan; 0.3 carat sells for about 7000 yuan, and the bigger it is, the more expensive it is. A beautiful diamond depends on its purity, whether there are cracks, how many cracks, color, cut and so on. The price is related to the above points! Purity, luster, weight, size, color (the purer the better), exquisite workmanship, it is generally impossible to see that it is a diamond without polishing. If it is a handicraft, it depends on the brand, and it is good to have a high popularity.

It should be pointed out that:

1. The higher the grade of the diamond, the greater the influence of the weight on the price.

2. It is especially obvious for diamonds with critical weight. Such as: 30 minutes, 40 minutes, 50 minutes, 1 carat, etc.

3. National standards less than 0.2 carats are not classified. 0.2 to 1 carat can be classified by both loose diamonds and inlaid diamonds. Diamonds larger than 1 carat must be classified by 4C according to the classification standard for loose diamonds.

The beautiful diamond ring proves sweet love. Since the diamond ring is the first choice for couples, what kind of diamond ring is suitable?

Generally speaking, it is more appropriate to choose a diamond-encrusted ring below 50 points, which can not only express love but also be accepted by people of the general income class. A single diamond ring of 30 to 40 cents is a common choice for white-collar workers. Some rings inlaid with broken diamonds are also loved by some people because of their exquisite design. If economic conditions permit, it is best to choose diamonds with a score of more than 50, because diamonds with a score of more than 50 have considerable ability to maintain and increase value and have certain investment value.

I remind you that while paying attention to the weight of diamonds, we must pay attention to the color, clarity and cut of diamonds, that is, comprehensively consider the "4c" standard. Diamonds with large weight, good cutting (bright light), few pure defects and white color are good diamonds. When buying diamond jewelry with a score of more than 40 points, don't forget to ask the merchant to show the appraisal certificate of the national testing department. In addition, it is suggested that when buying a diamond ring, it is best to buy earrings and pendants that can match it, so as to avoid regrets caused by improper matching of jewelry.

Similarly, it is very appropriate for a woman to give her boyfriend a diamond ring as a token. Generally speaking, platinum plain ring with diamond ring is more suitable, simple and generous, gorgeous and unobtrusive, which properly shows the owner's good taste.