Brand Story
LUMIA — Where Diamonds Meet Design.
LUMIA — Where Diamonds Meet Design.
GIA - Certificate
When purchasing a diamond, we pay close attention to its grading. The grading certificate serves as the diamond’s identity cardand to a certain extent, ensures its quality. Among all grading certificates,the most prestigious one is, of course, the GIA certificate issued by the Gemological Institute of America.
Learn more
IGI - Certificate
The most authoritative diamond grading institution in the world is the Gemological Institute of America (GIA). In addition to GIA, there are several other well-recognized gemological laboratories: HRD Antwerp (Hoge Raad voor Diamant) – Belgium's High Council for Diamonds IGI (International Gemological Institute) AGS (American Gem Society) EGL (European Gemological Laboratory) NGTC (National Gemstone Testing Center of China)
Learn more
HRD - Certificate
The HRD certificate is a diamond grade certificate issued by the Belgian Diamond High Council. What is the Belgian Diamond High Council? As the world's diamond trade center, Antwerp, Belgium established the Diamond High Council--HRD (Belgian Diamond High Council) in 1973. Its main work is to coordinate the activities of the Belgian diamond industry. After years of development, HRD has become an official organization recognized by Belgium and the world, serving as the organizer, spokesperson and media of the Antwerp diamond industry. It is also one of the most authoritative diamond inspection, research and certificate issuing institutions in the world, and is the highest official management organization of the diamond industry in the world's largest diamond trading place (Antwerp, Belgium). HRD is also at the forefront of the world in diamond processing and testing technology and equipment research. For example, the artifact in the link below was developed by HRD! 给我一颗钻，5秒便能辨真假 Now let’s have a look at their certificate! The section mainly consists of basic information about diamonds and the 4Cs 1. HRD logo 2. Certificate Number: HRD certificate number 3. Antwerp, March 25, 2010: location and time of certificate issuance 4. Shape: cutting shape For an introduction to round diamonds, click on the article below! 圆钻有话说！ You can click on the article below for more shapes! 你们都买圆钻？我偏不！ 5. Carat（weight）： Carat is the unit of diamond weight, called "克拉" in Chinese. 1 gram = 5 carats, 1 carat = 100 points 你所应该了解的关于4C的一切之克拉！ 6. Fluorescence： Diamond fluorescence refers to the emission of blue or yellow light or other colored light under strong ultraviolet light. According to the intensity level, it is divided into five levels: NONE, FAINT, MEDIUM, STRONG, and VERY STRONG. It cannot be felt under natural light. 7. Color Grade： Gem grade white diamonds start from D color to Z color. Diamond color starts with D, the first letter of Diamond, and is the whitest from D color, gradually turning yellow. The value also gradually decreases. 你所应该了解的关于4C的一切之颜色！ 8. Clarity Grade： Refers to the amount of inclusions in a diamond under a 10x magnifying glass. 你所应该了解的关于4C的一切之净度！ 9. Cut : Mainly look at three indicators: polish, cut proportion and symmetry Cut is very important for a diamond, it directly affects the brightness of the diamond. Even the best color and clarity diamond will be dull if the cut is not good. Grades are divided into EXELLENT (abbreviated as EX) VERY GOOD (abbreviated as VG) GOOD (abbreviated as G) FAIR 你所应该了解的关于4C的一切之切工！ 10. Proportion： The cutting proportion of a diamond will affect the reflection of light entering the diamond, which will further affect the fire of the diamond. 11. Polish： Polishing will increase the brightness of the diamond. After the diamond is cut, it must go through a polishing process to make the surface of the diamond smooth. A polished diamond is relatively brighter and will not affect the refraction of the diamond's fire. 12. Symmetry： Symmetry refers to whether a diamond is cut symmetrically on both sides. Since all diamonds have a maximum and minimum diameter, no diamond is completely symmetrical. ================================================ Below indicates: This is a 1.55 carat round diamond with medium fluorescence, F color, SI2 clarity, and VG, EX, EX cut. The following information are some technical info. 1. Measurements：size of diamond Diameter (minimum - maximum) * height The diameter is allowed to be a range, the unit is millimeter. The following information is the proportion data of the diamond 2. Girdle: Girdle Percentage 3. Culet: Culet 4. Total Depth: Total Depth Height Percentage 5. Table Width: Table Width 6. Crown Angle (β): Crown Angle 7. Pavilion Angle (α): Bottom Angle 8. Length Halves Crown: Half Length of Crown 9. Length Halves Pavilion: Half Length of Pavilion 10. Sum α&β: Sum of α&β Here, the clarity, cut and color grade table marks the 4C color of the diamond. Buyers can know at a glance what grade of the diamond they are buying. Here is the top view and bottom view of the diamond. If the diamond has obvious impurities or inclusions, they will be marked on the picture. Signature from the expert~ If you want to check the relevant diamond information, you can link to the HRD official website to check the certificate HRD certificate official website https://my.hrdantwerp.com/
Learn more