Identification Characteristics of Diamonds and Their Simulants

Diamond Knowledge / By

Gemstone (Gem) Mohs hardness (Hardness) Specific Gravity (Specific Gravity) Refractive Index (Refractive Index) Reflectivity (Reflectivity) Double Refraction (Double Refraction) Dispersion (Dispersion) Synthetic Rutil (Synthetic Rutil) 6.5 4.25 2.76 19.75 0.287 0.330 Synthetic Moissanite (Synthetic Moissanite) 9.25 3.22 2.67 20.67 Strained 0.104 Lithium Niobate (Lithium Niobate) 5.5 4.64 2.55 14.87 0.090 0.130 Diamond (Diamond) 10 3.52 …

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Sintering mechanism

Science Classroom / By

The specific surface area of the powder surface will change because of the size of the powder particles, when the powder particles are large, the specific surface area will decrease, when the powder particles are small, the specific surface area will increase, the size of the specific surface area relates to the size of the …

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Diamond Synthesis Method — High Temperature and High Pressure

Diamond Knowledge / By

Currently, the world’s popular high-temperature and high-pressure diamond synthesizing equipment mainly consists of two-sided tops (belt, which is mainly popular in Europe and the United States), six-sided tops (unique to Mainland China), and splitting spheres (barssplitsphere, Russia) or modified splitting spheres (Gemesis Company). In 1954, before Christmas, the General Electric Company in the United States …

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Formation of natural diamonds

Diamond Knowledge / By

Natural diamonds are produced at depths of over 130 kilometers. It has a unique cubic crystal structure. Each carbon atom in a diamond is bonded to four other carbon atoms, making it the hardest natural substance known in the world. How are diamonds formed? Let’s find out!

Diamond Synthesis Method – Chemical Vapor Deposition

Diamond Knowledge / By

How to make diamonds by chemical vapor deposition? Chemical vapor deposition (CVD) produces pure, high-performance solid materials. A small diamond, which serves as the “core”, is placed in a vacuum environment to remove impurities and injected with high temperature gases – methane and hydrogen – at 3,000 degrees Celsius, which cracks to form electrically charged …

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Subtlety Comparison Table of Diamond Micro Powder Standards

Diamond Knowledge / By

Subtlety Comparison Table of Diamond Micro Powder Standards JB/T7990-1979 GB6966-86 JB/T7990-1998 QB/HH1801-04 Corresponding number 0-0.25 W0.5 0-0.05 M0/0.5 0-0.5 W1 0-1 M0/1 0-1 M0.5/1 0.5-1 0.5-1 M0.5/1.5 0.5-1.5 0.5-1.5 M0/2 0-2 W1.5 0-2 M1/2 1-2 0.5-3 12000 W2.5 1.5-3 M1.5/3 1-3 10000 1.5-3 8000 2-3 7000 W3.5 2-4 M2/4 2-4 6000 W5 2.5-5 M2.5/5 2-5 …

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Subtlety Comparison Table of Synthetic Diamond with Foreign Standards

Diamond Knowledge / By

Subtlety Comparison Table of Synthetic Diamond with Foreign Standards China ISO FEPA America ANSI B74.16-1971 Japan JIS4130-1988 Germany DIN848-1988 Russia OCT9206-80 grit  Size  Microstructure Ⅰ Microstructure Ⅱ Size  Grit Size  grit  Size   Grit  Size  Microstructure Size   Grit  Size 40/45 425/355 426 —- 425/355 D426 425/355 40/50 425/300 40/50 425/300 D426 425/355 630/500 630/500 45/50 355/300 …

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