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9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct

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9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct

9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct
9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct 9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct 9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct

Large Image :  9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct

Product Details:
Place of Origin: Zhengzhou, China
Certification: None
Model Number: YD-A+
Payment & Shipping Terms:
Minimum Order Quantity: Negotiate
Price: Negotiate
Packaging Details: Carton box
Delivery Time: 1-15 working days
Payment Terms: T/T, Western Union
Supply Ability: 50000carats per month

9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct

Product Name: CVD Lab Grown Diamonds Brand: Yuda Crystal
Grade: High Assortment: Good
Color: GHI Clarity: VVS VS
Carat Weight: 8.0-8.99ct Cut: Uncut
Technology: CVD Shape: Rough, Raw
Usage: For Cutting CVD Diamonds Component: Carbon
Hardness: Moh's 10 Scale Available Type: HPHT, CVD
Place Of Origin: Zhengzhou, China Payment Terms: 100% Payment In Advance
Payment Mode: T/T, Bank Transfer, PayPal, Western Union Delivery Time: 1-15 Working Days Depends On Quantity
Courier: DHL, FedEx, UPS, TNT, EMS Etc Packaging: As Export Standard
Customization: Welcome Polish: None
Symmetry: None Sample Order: Welcome
Treatments Applied: None Enhancement: None
High Light:

HPHT Raw Uncut Diamond 8.0ct


11mm Raw Uncut Diamond


9mm real uncut diamond

Square Shape 9mm - 11mm GHI Color Cvd Hpht Uncut Rough For Making Round Brilliant White Color Jewelry


CVD Lab Grown Diamonds Description


Laboratory-grown diamonds, also known as laboratory-made diamonds, man-made diamonds and synthetic diamonds, are pure carbon diamonds that simulate the natural growth process of the earth under strictly controlled laboratory conditions.

What is high pressure high temperature (HPHT) diamond?
HPHT stands for High Pressure High Temperature Method, which is a main method used in laboratories to make diamonds. This diamond growth process requires carbon to be exposed to extreme temperature and pressure conditions, which simulate the extreme heat and pressure conditions when natural diamonds are formed in the depths of the earth.

The diamond seed crystal is placed under specially designed pressure conditions, and the growth chamber is heated to 1300-1600 °C, and the pressure is higher than 870,000 pounds per square inch (approximately 5,998,440 Pa). The molten metal decomposes high-purity carbon sources and deposits carbon atoms in one place. After the synthetic diamond starts to grow on a small diamond seed crystal, this laboratory-made crystal is cut by a diamond cutter.
In detail, HPHT diamonds are grown in a small chamber, which is located in a device that can generate extremely high pressure. The carbon raw materials (such as graphite) in the cabin are melted in a metal co-solvent composed of iron (Fe), nickel (Ni), cobalt (Co), etc., thereby reducing the temperature and pressure required for diamond growth. Then, the carbon material moves to the lower temperature diamond seed crystal with the help of the co-solvent, and crystallizes on it to form a synthetic diamond crystal. The crystallization process takes several days to several weeks to form one or more crystals.

Natural diamond crystals are often octahedrons, while HPHT synthetic diamond crystals usually have cubic surfaces in addition to the octahedral surface. Due to the different shapes of natural diamond crystals and HPHT synthetic diamond crystals, their internal growth patterns are also quite different. The difference in internal growth mode is a reliable way to distinguish natural diamond crystals from synthetic diamond crystals.

Synthetic gemstones that have been faceted usually show special color distribution characteristics, fluorescence partitions and twinning patterns, which are all related to the cross-shaped growth zone structure of the crystal. Sometimes this type of gemstone will also have dark metallic flux inclusions. In some cases, this material will exhibit phosphorescence, that is, after being exposed to an ultraviolet light source, it can continue to emit light even if the light source is turned off.

The production of colorless HPHT synthetic diamonds was once a big problem. Nitrogen turns diamonds yellow, so it must be excluded from the growing environment. In addition, high-clarity colorless diamonds require a longer growth time, and the temperature and pressure conditions required for their growth also need better control.


Parameters of CVD Lab Grown Diamonds


CVD Rough Diamonds Details
Brand Name Yuda Crystal
Name CVD Rough Diamonds
Diamond Color GHI
Diamond Clarity VVS-SI
Diamond Carat Weight 3.0-15.0carat
Diamond Cut Uncut
Technology CVD
Size Customization
Shape Raw, Square
Application For Cutting Lab Grown Loose Diamonds
Place Of Origin Zhengzhou, China
Delivery Time 1 - 7 Working Days Base on Order Quantity
Payment Terms 100% Payment In Advance
Payment Methods T/T, PayPal, Western Union, Bank Transfer
Shipping way DHL, FedEx, SF Express, UPS, EMS, TNT etc
M.O.Q Negotiable
Diamond Type Synthetic(lab created)
Location Zhengzhou, China
Treatments Applied None
Fire Dispersion 0.044(Same as Natural Diamond)
Brilliance Refraction Index 2.42(Same as Natural Diamond)
Relative Density 3.52(Same as Natural Diamond)
Chemical Composition Carbon(Same as Natural Diamond)
Moh's Hardness 10(Same as Natural Diamond)


CVD Lab Grown Diamonds​ Introduction


Natural diamonds are created by nature and are the result of high temperature and pressure formed over billions of years. The Rough Lab Grown Diamonds are produced in the laboratory, usually in a few weeks. The chemical difference between the two is same.

So how do you distinguish between Rough Lab Grown Diamonds and natural diamonds?

There is no obvious difference between the Rough Lab Grown Diamonds and natural diamonds. Even professional gemologists need special equipment to identify them. By zooming in, professionals will be able to discern subtle contrasts in diamond inclusions grown and mined in the laboratory.


The Difference Between Lab Diamond And Natural Diamond
Properties Earth Mined Lab Created
Guaranteed Conflict-Free No Yes
Hardness (MOHS) 10 10
SP3 Carbon Diamond Bonds (%) 100% 100%
Internal Crystal Structure Face-Centered Cubic Face-Centered Cubic
Hardness Comparable 2.42 2.42
Relative Diversity 3.52 3.52
Color Diffusion 0.044 0.044
Color Various Grades K to D grades
Price $$$$$ $$$


CVD Lab Grown Diamonds Details

9mm 11mm GHI Color CVD HPHT Raw Uncut Diamond 8.0ct To 8.99ct 0


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Henan Yuda Crystal Co.,Ltd

Contact Person: Ms. Pang

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