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Rectangular GHI Color 8.0 9.0 Carat CVD Rough Diamonds For Enagement Ring

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
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: GHI Clarity: VVS VS
Carat Weight: 8.0-9.0ct Cut: Uncut
Technology: CVD Shape: Rough, Raw, Rectangular
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:

9.0 Carat CVD Rough Diamonds


GHI Color CVD Rough Diamonds


Rectangular uncut unpolished diamond

Product Description

Rectangular Shape GHI Color 8.0-9.0 Carat CVD Rough Diamonds For 2.5ct Cvd Diamond Enagement Ring Making


CVD Rough Diamonds​ Description


Lab grown rough diamonds include HPHT rough diamonds and CVD rough diamonds. Both HPHT and CVD are the two main methods to make lab grown rough diamonds.


How are lab grown rough diamonds made? Let's see the below two main methods which can make lab grown rough diamonds.


1. High pressure high temperature process (HPHT)


In the laboratory to create a high pressure and high temperature environment to produce lab grown diamonds, that is to imitate the formation conditions of mined diamonds in the depths of the earth. In the growth chamber, the carbon source decomposes in the molten metal, and the carbon atoms gather on a very small lab grown or mined diamond seed through the metal to form a unique lab created rough diamonds.


2. Chemical vapor deposition (CVD)


Lab grown diamonds are produced in a laboratory vacuum using carbon rich gases such as methane. The process of CVD is to decompose methane into carbon and hydrogen atoms, and then deposit them on diamond seeds to form square and flat lab grown diamond crystals.


How long does it take to make a lab grown diamond?


It usually takes weeks to make diamonds in the laboratory. Compared with the millions or even billions of years of mined diamond formation in the depths of the earth, it's very short for creating lab grown diamonds.


Due to the different formation conditions, the nature of mined diamonds and cultivated diamonds are also different. Natural diamonds grow into octahedral crystals (eight equilateral triangular facets), while cultivated diamonds can grow into both octahedral and cubic crystals (six square facets).


Parameters of CVD Rough Diamonds


CVD Rough Diamonds Details
Brand Name Yuda Crystal
Name CVD Rough Diamonds
Diamond Color GHI
Diamond Clarity VVS-SI
Diamond Carat Weight 8.0-9.0carat
Diamond Cut Uncut
Technology CVD
Size Customization
Shape Raw, Rectangular
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 Rough 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 Rough Diamonds Details


Rectangular GHI Color 8.0 9.0 Carat CVD Rough Diamonds For Enagement Ring 0

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