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Big Size 8ct 10ct 15ct Rough Lab Grown Diamonds D E F G Color Large Synthetic Diamond

Minimum Order Quantity : Negotiate Price : Negotiate
Packaging Details : Carton box Delivery Time : 3-7 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: Rough Lab Grown Diamonds Brand: Yuda Crystal
Grade: High Assortment: Good
Color: DEFG Clarity: VVS VS SI
Carat Weight: 8.0ct - 15.0ct Cut: Uncut
Technology: HPHT Shape: Rough, Raw
Usage: For Cutting Lab Grown Polished 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:

15ct Rough Lab Grown Diamonds


D E F G Color diamond


10ct large synthetic diamond

Product Description

8ct 10ct 15ct Rough Lab Grown Diamonds DEFG Color For Making Big Sizes Loose Diamond


Rough Lab Grown Diamonds Description


Chemical vapor deposition (CVD) is a process in which the carbon containing gas is dissociated and the carbon atoms are deposited on the substrate to form diamond films. The substrate can be non diamond material, but single crystal diamond is usually formed by carbon atoms depositing on the diamond substrate. Usually, one or more gases are used, assisted by high-purity methane, hydrogenation, nitrogen and other gases, so that the carbon molecules in methane, like diamonds, are continuously accumulated on the original diamond. After layer by layer proliferation, transparent diamonds up to 10 carats can be formed. In order to make CVD diamond grow smoothly, methane with diamond structure is often used as carbon source. Methane can be regarded as monatomic diamond pressed out by hydrogen, nitrogen can increase the growth rate, and hydrogen can inhibit the formation of graphite. Generally, diamond cultivation by CVD is carried out under the condition of low pressure and high temperature, the pressure is generally less than one atmosphere, and the temperature is about 1000 ℃. The cultivation process takes about 10-12 weeks. The ingredients and properties of the cultivated diamonds are not different from those of natural diamonds, which is difficult to distinguish with naked eyes.

Diamond crystals grown by CVD are mostly plate-shaped, and occasionally small octahedral faces and diamond dodecahedral faces can be seen at the edge. The color of early CVD diamonds is dark brown or light brown, while recently discovered CVD diamonds have been proved to be colorless or nearly colorless after high temperature heat treatment. There are few inclusions in CVD diamonds, some of which are needle like and black irregular. However, it can not be used as a basis for distinguishing natural diamonds from HTHP synthetic diamonds. There is no metal inclusion in CVD diamond, so it is not magnetic.

The results show that the early cultivated diamonds show orange to orange fluorescence, and the short wave is stronger than the long wave; the newly discovered CVD cultivated diamonds have yellow green fluorescence, and the short wave is stronger than the long wave, and most of them have phosphorescence. Under ultrashort wave ultraviolet lamp, CVD diamonds have typical layered growth structure, which is the main identification feature of CVD diamonds.


Parameters of Rough Lab Grown Diamonds


Rough Lab Grown Diamonds Details
Brand Name Yuda Crystal
Name Rough Lab Grown Diamonds
Diamond Color D-F
Diamond Clarity VVS-SI
Diamond Carat Weight 8.0-15.0 carat
Diamond Cut Uncut
Technology HPHT, CVD
Size 5.0-20.0mm
Shape Raw
Application For Cutting Big size 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)


Rough 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 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 Lab Grown Diamonds and natural diamonds?

There is no obvious difference between the 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 $$$$$ $$$



Rough Lab Grown Diamonds Details


Big Size 8ct 10ct 15ct Rough Lab Grown Diamonds D E F G Color Large Synthetic Diamond 0

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