Diamond epitaxy (diamond advancement)

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List of contents for this article:

• 1、Cultivating diamonds in the past and present
• 2、What are artificial diamonds made of and how are artificial diamonds obtained?
• 3、What is the cultivation process of pink diamonds?

Cultivating diamonds in the past and present

The Gemological Institute of America (GIA) updates its certificate terminology to replace "synthetic diamonds" with "labor-grown diamonds" to increase consumer acceptance. JEWELLWANG Diamond Seal introduces cultivated diamonds to the China Tmall platform, providing high-quality products with 3EX cutting and 4C standard grading, and promoting market transparency. 2020s: The price of cultivated diamonds is only 1/3-1/5 of that of natural diamonds, and its environmentally friendly and sustainable characteristics are in line with the needs of young consumers, and its market share is growing rapidly.

Mosan diamonds have also begun to get rid of the label of "fake diamonds" and shift to emphasizing their own aesthetic value.

Accurately understand the "past and present" of a variety When it comes to traceability, most people may first think of "blockchain" traceability. In fact, unlike "blockchain" that achieves "traceability" by making commodity circulation channels transparent (it is understood that "blockchain" has not been able to truly "anti-counterfeiting" the product itself so far), the traceability we are talking about here is the traceability of the endogenous genetic fingerprint of the variety.

There are many diamond rings at different price points on the market. Depending on the quality of the diamond, the price of diamond rings is also divided into various levels.

What are artificial diamonds made of and how are artificial diamonds obtained?

There are three types of methods for artificial diamond: direct, fusion medium and epitaxial. Direct method: Using static ultra-high pressure and high temperature technology, dynamic ultra-high pressure and high temperature technology, or a mixture of the two, carbonaceous raw materials such as graphite are directly transformed from solid or molten state into diamond. The diamond obtained by this method is polycrystalline powder with micron size.

The manufacturing methods of artificial diamond mainly include static pressure catalytic method, explosion method, etc. Hydrostatic pressure catalytic method: It is currently the most widely used method in industrial production. About 99% of artificial diamonds are produced using this method. It uses catalysts (such as iron, nickel, cobalt and other metals or alloys) to catalyze the conversion of carbon into diamond under high temperature and high pressure conditions.

Artificial diamonds: Artificial diamonds are artificially synthesized in the laboratory through techniques such as high temperature and high pressure (HPHT) or chemical vapor deposition (CVD). These synthesis methods can simulate the high temperature and high pressure conditions in the deep earth, allowing carbon atoms to recrystallize in specific environments to form diamond crystals.

Artificial diamonds are synthesized in a laboratory environment by simulating the high temperature and pressure conditions under which natural diamonds are formed. Their chemical composition is exactly the same as natural diamonds. However, their formation process appears rapid and artificial compared with the geological evolution process of natural diamonds over hundreds of millions of years. The manufacturing steps of artificial diamonds involve placing a metal container containing pre-prepared diamond seeds in special high temperature and high pressure equipment.

What is the cultivation process of pink diamonds?

1. At present, the mainstream cultivated pink diamonds are mainly prepared by high temperature and high pressure (HPHT) method and chemical vapor deposition (CVD) method. The core process includes two key links: diamond epitaxial growth and pink color treatment. There are differences in specific operations of different technical routes.

2. The mainstream process of artificially cultivating pink diamonds: (1) High-temperature and high-pressure method (HPHT): Simulate the high-pressure and high-temperature environment of the earth's mantle, place graphite or diamond seed crystals in an environment of 1400-1600℃ and 5-7GPa, and add catalytic metals such as iron and nickel to promote the conversion of graphite into diamond; by accurately controlling the introduction of impurities during the growth process, or subsequently using high-energy electron irradiation + annealing treatment, the density of lattice defects is controlled, thereby producing powder-tone diamonds.

3. The stronger the color of the rare pink diamonds (such as thick color powder and bright color powder), the higher the price. Currently, mainstream laboratory cultivation methods include CVD (Chemical Vapor Deposition) and HPHT (High Temperature and High Pressure Method). There is little difference in the price of diamonds produced by the two technologies, but color stability will affect pricing. 3 core cost factors: color grade: light pink bare diamonds are about 20,000 - 50,000 yuan, and those reaching the "rose powder" level may exceed 80,000 yuan.

4.###Basic cost composition Currently, the main technologies for cultivating pink diamonds in the laboratory are divided into high temperature and high pressure (HPHT) and chemical vapor deposition (CVD). The pink diamonds produced by HPHT technology are closer to natural products, and the cost per carat is about 80,000 - 150,000 yuan;CVD technology achieves a pink effect through later irradiation, and the cost is slightly lower, about 50,000 - 120,000 yuan.

5. The cost of cultivating a carat pink diamond is about 8,000 - 50,000 yuan. The large price span is mainly determined by the color and craftsmanship. If you are paying attention to cultivating pink diamonds in the laboratory, you need to first understand the special pricing logic in this field. Different from the 4C standard of traditional white diamonds, the core value of pink diamonds lies in color saturation and manufacturing process. These two factors are enough to increase the price difference between products of the same specification several times.