hpht The difference between synthetic diamonds and diamonds (the difference between synthetic diamonds and real diamonds)

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List of contents for this article:

• 1、Are synthetic diamonds the same as cultivated diamonds?
• 2、Why are natural diamonds and artificial diamonds different?
• 3、Learn to identify synthetic diamonds and gemstones_Stay away from fakes and cheated goods

Are synthetic diamonds the same as cultivated diamonds?

Synthetic diamonds and cultivated diamonds are essentially the same artificially cultivated diamond product, and are only different names commonly used in the industry.

Synthetic diamonds and cultivated diamonds are essentially the same artificial diamond products, and are only different expression habits in the industry. Both are diamond crystals synthesized by simulating the growth environment of natural diamonds in the laboratory and using high temperature and high pressure (HPHT) or chemical vapor deposition (CVD) technology. The chemical composition, physical hardness, and optical properties are completely consistent with those of natural diamonds, and they all belong to the real diamond category.

There is a clear difference between cultivated diamonds and synthetic diamonds. The two are a category relationship of inclusion and inclusion. Differences in category definition: Synthetic diamond is a broad term that refers to all diamond materials prepared by artificial methods (high temperature and high pressure methods, chemical vapor deposition methods, etc.), covering two major categories: industrial grade and gem-grade; cultivated diamonds only belong to the gem-grade synthetic diamond subdivision category.

Synthetic diamonds and cultivated diamonds are essentially the same product, but they are only called differently in different contexts. The core attributes of the two are exactly the same: they are both prepared by manual means in the laboratory (the mainstream is high temperature and high pressure HPHT method, chemical vapor deposition CVD method), and their chemical composition, crystal structure, physical hardness, and optical properties are exactly the same as natural diamonds, and they belong to the real Diamond category.

Cultivated diamonds, that is, synthetic diamonds, are exactly the same as natural diamonds in terms of physical and chemical properties, and there is no difference in visual effects.

The same definition: cultivated diamonds, also known as laboratory-cultivated diamonds and synthetic diamonds, are diamonds generated and manufactured by artificial methods to simulate the crystallization characteristics of natural diamonds. Same nature: Cultivated diamonds and natural diamonds are exactly the same in appearance, chemical composition, crystal structure and physical properties, but there are differences in the growth environment. One is naturally formed and the other is artificially formed in the laboratory. Technical methods: The methods for cultivating diamonds mainly include HTHP method and CVD method.

Why are natural diamonds and artificial diamonds different?

1. The growth mechanism and cycle are different: Natural diamonds are formed in the mantle layer 150-200 kilometers deep in the earth. They are slowly crystallized for billions of years under extreme high temperature and high pressure environments of 1,000 - 1,600 ℃ and 5-6GPa. They are subsequently brought to the surface with volcanic activity of kimberlite or potassium-magnesium lamprophyre.

2. Differences in performance: Most of the fluorescence reactions of natural diamonds are blue-white, and some of them are accompanied by phosphorescence; the fluorescence characteristics of artificial diamonds can be controlled through process, and some products have no fluorescence or have differences in fluorescence colors. At present, high-end jewel-grade artificial diamonds can be close to natural diamonds in appearance, and they need to be accurately distinguished through professional testing methods such as infrared spectroscopy and ultraviolet-visible spectroscopy.

3. Luminous characteristics: Artificial diamonds may emit different colors of fluorescence under X-ray irradiation. Abnormal birefringence: Artificial diamonds may exhibit birefringence due to differences in crystal structure, but natural diamonds usually do not have this feature. Simple method: Observation certificate: Artificial diamonds from regular channels will be clearly marked as "synthetic" or "laboratory cultivated". Color judgment: The yellow or brown-yellow hourglass band of artificial diamonds is a distinctive feature.

Learn to identify synthetic diamonds and gemstones_Stay away from fakes and cheated goods

CVD: Look for graphite, cracks or chain bead-like inclusions. Certificate verification: Require merchants to provide international authoritative certificates such as GIA and IGI, and check whether the certificate number is consistent with the diamond girdle engraving. Identification and synthesis method and characteristic flame fusion method of synthetic rubies and sapphire: Ruby: The crystal is rod-shaped, common red, orange-red, and purple-red. Sapphire: The crystal is pear-shaped, common in blue, green, pink, yellow, etc., and even colorless varieties.

Learn to identify synthetic diamonds and gemstones and stay away from fakes and pits as follows: Understand synthetic diamonds HPHT Synthetic diamonds: Made through high temperature and high pressure treatment, are usually colored, such as dark yellow, although colorless or blue diamonds can also be synthesized., but the output is small. It is magnetic and may have rod-like inclusions or needle-like iron-nickel alloy inclusions when viewed with the naked eye.

In the jewelry circle, there is a type of pit goods that are not processed defective goods, but crystalline or amorphous bodies that are completely or partially manufactured by humans and have known counterparts in nature, also called synthetic gems. For ordinary people, we should keep our eyes open when buying gems and diamonds to avoid being deceived.