GIA is the most authoritative diamond appraisal institution in the world, and the current setter of diamond 4C standard. As a non-profit organization, GIA appraisal certificate is known for its impartiality, recognized by people inside and outside the industry, and can be called the identity certificate of diamonds
generally, diamonds with more than 30 points in China are now equipped with GIA diamond certificates. However, since the identification cost of GIA diamond certificates is relatively expensive, the price of diamonds with GIA certificates is also higher than that of others
2. HRD diamond appraisal center
HRD is the diamond appraisal certificate of Belgium, the certificate officially recognized by Belgium, and one of the most authoritative diamond appraisal certificates in the world. HRD diamond color certificate focuses on the detailed characteristics that determine the value of colored diamonds, such as color description, color design and luminescence. It plays an important role in determining whether the diamond after detection is a natural colored diamond or a imitation diamond
3. NGTC diamond appraisal center
NGTC is also the national jewelry and jade quality center. No matter whether it is naked diamonds or diamond jewelry, there is no laser coding, and most diamond grading in national inspection is based on inlaid diamond rings. If you buy diamond jewelry instead of naked diamonds, NGTC will be the most convenient diamond certificate authentication center
the above three are relatively authoritative diamond identification certificates at present. When consumers buy diamonds or naked diamonds, if they have doubts about the authenticity or grade of diamonds, they can go to these authoritative diamond identification institutions for re identification and confirmation
extended data
self identification method:
1. Since the crystal cell of diamond is a five atom tetrahedron, its crystal structure can be regarded as a tetrahedron combination connected by the corner apex, regular repetition and three-dimensional arrangement. Diamonds composed of tetrahedrons are commonly cubic, octahedral and rhombic dodecahedral crystals. Their surfaces are smooth and flat, mirror like, without smooth texture or grooves. Those with smooth texture or groove are imitations
2. The hardness of real diamond is extremely high, which is grade 10. You can observe the waist of the diamond. If the waist is in the shape of sand, this method is most suitable. Because the diamond is harder than any counterfeit, it will not appear fine lines like the counterfeit. The waist of the diamond is in a granular appearance
3. Similarly, because diamonds are harder than counterfeit products, the facet lines of counterfeit products tend to be rounder than diamonds, and the facet lines of diamonds must be sharp
4. Based on the principle that diamonds are harder than counterfeit products, the facet lines of counterfeit products are often worn
5. If the diamond has a natural surface, there is a chance to find the unique "triangular growth pattern" of the diamond on the natural surface
6. If the diamond has a broken surface, the appearance is usually stepped, while the counterfeit will be very different in curved arc or shell shape
diamond certification is the most basic way for you to ensure that you get a quality diamond. The classification of the diamond is accurate and there is no deviation. All bulk diamonds of LOVA jewelry are analyzed and graded by (GIA), which is one of the most respected and accurate laboratories in the diamond industry. In addition, all Luohua jewelry manufacturers have passed the optical performance certification of the optical measurement collar. To verify the quality of diamonds before purchase, if you want to purchase diamonds from lowa, please be sure to check its diamond classification report or diamond files and certificates. You may also know that when you purchase custom rings, pendants or earrings from lowa jewelry, there is an evaluation, including the value of retail replacement for insurance
the difference between diamond grading report and diamond file apart from your home, buying diamonds may be one of the biggest investments in your life. This is why diamond grading (i.e. certification) is so important. The two main reports issued by GIA are diamond classification report and diamond. Moreover, although they are similar, there are also big differences
diamond grading report: many people think that this is the blueprint of diamonds. Starting from 4C, cutting, clarity, color and carat reports include accurate measurements and shapes, as well as feature maps or maps of individual diamonds. The diamond grading report will also indicate whether the diamonds have belt inscriptions and describe important features beyond the clarity grade diamond file: this file provides the same classification information as the diamond classification report, minus the chart drawn. In order to prove its authenticity, the file also includes the laser inscription number on the diamond belt
check the GIA certificate sample be familiar with the appearance and direction of GIA diamond grading certificate. Please pay attention to 4C, the chart drawn and the mapping of stone proportions. You can find the GIA classification certificate on the Luohua jewelry website on the product page of each bulk diamond
is it important to obtain diamond grading report when purchasing diamonds your diamond certification is very important, sometimes called 5C Diamonds with GIA classification certificates will help you solve the following problems:
confirm the quality of diamonds help verify the ownership of maintenance or insurance if you want to resell diamonds, prove the quality of diamonds
I believe that after reading so many little knowledge about certificates, consumers should know the importance of certificates. Next, Luohua jewelry will update more little knowledge about jewelry and diamonds, Interested friends, don't miss it. For more information, please visit Luohua jewelry official website:
In fact, any professional gemstone appraisal institution can issue a gemstone appraisal certificate with legal benefits diamonds are easy to identify, and the identification methods I have found from some netizens are quite feasible:
oiliness test: draw a line on the diamond table with a special pen or ball pen made of oil-based ink, and it will leave an uninterrupted straight line. While other imitations do not have lipophilicity, leaving intermittent dotted lines at the scribe line
water drop test: the water drop on the diamond will remain spherical for a long time, while the water drop on the imitation will disperse in a relatively short time
breath test: breathe on the diamond. If the moisture on the diamond disappears immediately, it becomes a real diamond; If the water vapor stays on the diamond for a few seconds before disappearing, it is a fake diamond
feeling test: when you touch the diamond and its imitation with your tongue at room temperature, the diamond is much cooler than the imitation.
a very simple and good way to identify it is to put it on a piece of wired paper, turn it upside down, and let the table face down. Can you see the line through it? If it can be a imitation diamond, natural diamonds can't see it. This method is very simple
however, I personally suggest using a "diamond pen (also known as a thermal conductivity meter)" to distinguish, which is more simple and scientific diamonds should have two certificates, one is "gemstone identification certificate" and the other is "Diamond classification certificate". The former costs 20-50 yuan, and the latter 150 yuan
I have a professional background in gemstone identification. If you have any questions, please go to Baidu Post Bar "gemstone" to have a look!
Diamond appraisal scheme:
1. GIA diamond appraisal center
GIA is the most authoritative diamond appraisal institution in the world, and the current setter of diamond 4C standard. As a non-profit organization, GIA appraisal certificate is known for its impartiality, recognized by people inside and outside the industry, and can be called the identity certificate of diamonds
generally, diamonds with more than 30 points in China are now equipped with GIA diamond certificates. However, since the identification cost of GIA diamond certificates is relatively expensive, the price of diamonds with GIA certificates is also higher than that of others
2. HRD diamond appraisal center
HRD is the diamond appraisal certificate of Belgium, the certificate officially recognized by Belgium, and one of the most authoritative diamond appraisal certificates in the world. HRD diamond color certificate focuses on the detailed characteristics that determine the value of colored diamonds, such as color description, color design and luminescence. It plays an important role in determining whether the diamond after detection is a natural colored diamond or a imitation diamond
3. NGTC diamond appraisal center
NGTC is also the national jewelry and jade quality center. No matter whether it is naked diamonds or diamond jewelry, there is no laser coding, and most diamond grading in national inspection is based on inlaid diamond rings. If you buy diamond jewelry instead of naked diamonds, NGTC will be the most convenient diamond certificate authentication center
the above three are relatively authoritative diamond identification certificates at present. When consumers buy diamonds or naked diamonds, if they have doubts about the authenticity or grade of diamonds, they can go to these authoritative diamond identification institutions for re identification and confirmation
extended data
self identification method:
1. Since the crystal cell of diamond is a five atom tetrahedron, its crystal structure can be regarded as a tetrahedron combination connected by the corner apex, regular repetition and three-dimensional arrangement. Diamonds composed of tetrahedrons are commonly cubic, octahedral and rhombic dodecahedral crystals. Their surfaces are smooth and flat, mirror like, without smooth texture or grooves. Those with smooth texture or groove are imitations
2. The hardness of real diamond is extremely high, which is grade 10. You can observe the waist of the diamond. If the waist is in the shape of sand, this method is most suitable. Because the diamond is harder than any counterfeit, it will not appear fine lines like the counterfeit. The waist of the diamond is in a granular appearance
3. Similarly, because diamonds are harder than counterfeit products, the facet lines of counterfeit products tend to be rounder than diamonds, and the facet lines of diamonds must be sharp
4. Based on the principle that diamonds are harder than counterfeit products, the facet lines of counterfeit products are often worn
5. If the diamond has a natural surface, there is a chance to find the unique "triangular growth pattern" of the diamond on the natural surface
6. If the diamond has a broken surface, the appearance is usually stepped, while the counterfeit will be very different in curved arc or shell shape
reference: Baidu Encyclopedia: diamond identification
Diamond certification
diamond certification is the most basic way for you to ensure that you get a quality diamond. The classification of the diamond is accurate and there is no deviation. All bulk diamonds of LOVA jewelry are analyzed and graded by (GIA), which is one of the most respected and accurate laboratories in the diamond industry. In addition, all Luohua jewelry manufacturers have passed the optical performance certification of the optical measurement collar. To verify the quality of diamonds before purchase, if you want to purchase diamonds from lowa, please be sure to check its diamond classification report or diamond files and certificates. You may also know that when you purchase custom rings, pendants or earrings from lowa jewelry, there is an evaluation, including the value of retail replacement for insurance
the difference between diamond grading report and diamond file
apart from your home, buying diamonds may be one of the biggest investments in your life. This is why diamond grading (i.e. certification) is so important. The two main reports issued by GIA are diamond classification report and diamond. Moreover, although they are similar, there are also big differences
diamond grading report: many people think that this is the blueprint of diamonds. Starting from 4C, cutting, clarity, color and carat reports include accurate measurements and shapes, as well as feature maps or maps of individual diamonds. The diamond grading report will also indicate whether the diamonds have belt inscriptions and describe important features beyond the clarity grade
diamond file: this file provides the same classification information as the diamond classification report, minus the chart drawn. In order to prove its authenticity, the file also includes the laser inscription number on the diamond belt
check the GIA certificate sample
be familiar with the appearance and direction of GIA diamond grading certificate. Please pay attention to 4C, the chart drawn and the mapping of stone proportions. You can find the GIA classification certificate on the Luohua jewelry website on the product page of each bulk diamond
is it important to obtain diamond grading report when purchasing diamonds
your diamond certification is very important, sometimes called 5C Diamonds with GIA classification certificates will help you solve the following problems:
confirm the quality of diamonds
help verify the ownership of maintenance or insurance
if you want to resell diamonds, prove the quality of diamonds
I believe that after reading so many little knowledge about certificates, consumers should know the importance of certificates. Next, Luohua jewelry will update more little knowledge about jewelry and diamonds, Interested friends, don't miss it. For more information, please visit Luohua jewelry official website:
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In fact, any professional gemstone appraisal institution can issue a gemstone appraisal certificate with legal benefits
diamonds are easy to identify, and the identification methods I have found from some netizens are quite feasible:
oiliness test: draw a line on the diamond table with a special pen or ball pen made of oil-based ink, and it will leave an uninterrupted straight line. While other imitations do not have lipophilicity, leaving intermittent dotted lines at the scribe line
water drop test: the water drop on the diamond will remain spherical for a long time, while the water drop on the imitation will disperse in a relatively short time
breath test: breathe on the diamond. If the moisture on the diamond disappears immediately, it becomes a real diamond; If the water vapor stays on the diamond for a few seconds before disappearing, it is a fake diamond
feeling test: when you touch the diamond and its imitation with your tongue at room temperature, the diamond is much cooler than the imitation.
a very simple and good way to identify it is to put it on a piece of wired paper, turn it upside down, and let the table face down. Can you see the line through it? If it can be a imitation diamond, natural diamonds can't see it. This method is very simple
however, I personally suggest using a "diamond pen (also known as a thermal conductivity meter)" to distinguish, which is more simple and scientific
diamonds should have two certificates, one is "gemstone identification certificate" and the other is "Diamond classification certificate". The former costs 20-50 yuan, and the latter 150 yuan
I have a professional background in gemstone identification. If you have any questions, please go to Baidu Post Bar "gemstone" to have a look!
The easiest way to identify diamonds is to use a piece of paper and a pen to teach you how to identify genuine and fake diamonds