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3ct 3.5ct 4ct Square Shape CVD Lab Grown Diamonds OEM ODM

Minimum Order Quantity : Negotiate Price : Negotiate
Packaging Details : Carton box Delivery Time : 1-7 working days
Payment Terms : T/T, Western Union Supply Ability : 50000carats per month
Place of Origin: Zhengzhou, China Brand Name: YUDA CRYSTAL
Certification: None Model Number: YD-A+

Detail Information

Product Name: CVD Lab Grown Diamonds Brand: Yuda Crystal
Grade: High Assortment: Good
Color: EFG Clarity: VVS VS SI
Carat Weight: 3.0-3.99ct 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: 1-7 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:

CVD Lab Grown Diamonds OEM


4ct CVD Lab Grown Diamonds


Square Shape 3ct lab diamond

Product Description

3.0ct - 4.0ct Square Shape CVD Lab Grown Diamonds for Making Lab grown loose diamonds


CVD Lab Grown Diamonds Description


CVD stands for chemical vapor deposition, which is another method of making diamonds in the laboratory. The growth of this kind of diamond requires proper pressure and temperature of the hydrocarbon gas mixture in the vacuum chamber.

CVD diamond growth process
Place the diamond seed in the diamond growth chamber.

A carbon-containing gas is injected into the growth chamber.

Heat the growth chamber to 900-1200°C.

The microwave beam causes carbon to fall from the plasma cloud and deposit on the seed crystal.

Every few days, the diamond is taken out, the top surface of the diamond is polished, and the non-diamond carbon elements are removed from it, and then returned to the growth chamber. Each batch of diamonds may need to go through several start/stop cycles, and the entire growth process takes three to four weeks.

After taking out the synthetic diamond crystals, these crystals can be cut and polished to make the final product.

In detail, CVD diamonds are grown in a vacuum chamber filled with a mixture of hydrocarbons (such as methane). An energy source (such as a microwave beam) breaks down the gas molecules, and the carbon atoms are adsorbed down to the flat diamond seeding disk at a lower temperature. The crystallization process takes several weeks, and multiple crystals grow at the same time. The exact number depends on the size of the vacuum chamber and the number of seeding discs. Such plate-like crystals usually form rough edges of black graphite that need to be removed. They will also appear brown, and this color can be removed by heat treatment before the gem faceting step.


Parameters of CVD Lab Grown Diamonds


CVD Lab Grown Diamonds Details
Brand Name Yuda Crystal
Name CVD Lab Grown Diamonds
Diamond Color EFG
Diamond Clarity VVS-SI
Diamond Carat Weight 3.0-4.0carat
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 - 15 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


3ct 3.5ct 4ct Square Shape CVD Lab Grown Diamonds OEM ODM 0

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