Contact Us

Contact Person : Li

Phone Number : +86 371 53395413

WhatsApp : +8615225124915

Free call

4.0ct 5.0ct Synthetic HPHT Rough White Diamonds VVS VS D F For Necklace

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: Synthetic White HPHT Rough Diamonds Brand: Yuda Crystal
Grade: High Assortment: Good
Color: DEF Clarity: VVS VS
Carat Weight: 4.0-5.0carat 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:

4.0ct HPHT Rough White Diamonds


5.0ct Synthetic Rough white Diamonds


VVS VS D F raw white diamond

Product Description

4.0-5.0ct Synthetic White HPHT Rough Diamonds With VVS VS Clarity and D-F Color


Synthetic White HPHT Rough Diamonds Description


How does high temperature and high pressure (HPHT) grow Synthetic White HPHT Rough Diamonds?


HPHT is called high pressure high temperature. First of all, the term HPHT includes two concepts: HPHT lab grown diamond and HPHT treated processed. For example, brown diamonds can be turned yellow or colorless by HPHT treatment.


High temperature and high pressure (HPHT) and chemical vapor deposition (CVD) are the two most commonly used growth methods in Synthetic White HPHT Rough Diamonds industrial.


Specifically, the Synthetic White HPHT Rough Diamonds growth process is to put high-purity graphite as carbon source in the high temperature area of the growth chamber of the top press, and place natural or cultivated diamond seeds in the low temperature area. Driven by a certain temperature gradient, carbon will diffuse from the high concentration area at high temperature to the low concentration area at low temperature, and crystallize at low temperature when the seed crystal is supersaturated. Through the seed crystal, it will 'germinate and grow up' just like the seed. Therefore, this method is also called seed temperature gradient method.


High temperature and high pressure (the pressure is generally 10-20Gpa, Generally, graphite can be directly transformed into diamond at 1400-1700℃. However, due to the high temperature and pressure required in the growth process, the technology is very difficult. At present, metal catalysts (such as Fe, Ni, Mn, CO and their alloys) are added in the industrial growth process as catalysts (or fluxes) to reduce the growth temperature and pressure, Improve the reaction conditions and speed up the reaction rate (usually the pressure is 5-6Gpa and the temperature is 1300-1600℃).


Generally, after more than ten hours, the growth of Synthetic HPHT Rough Diamonds is completed. However, at this time, the Synthetic White HPHT Rough Diamonds surface will be coated with carbon and metal catalyst, and these impurities need to be removed by pickling solution (made of 90% concentrated sulfuric acid and 10% concentrated nitric acid). After the impurities are removed by acid pickling, the unique "growth trace" of Synthetic White HPHT Rough Diamonds will be left on the surface of original diamond.


Parameters of Synthetic White HPHT Rough Diamonds


Synthetic White HPHT Rough Diamonds Details
Brand Name Yuda Crystal
Name Synthetic White HPHT Rough Diamonds
Diamond Color D-E-F
Diamond Clarity VVS-VS
Diamond Carat Weight 4.0 - 5.0 carat
Diamond Cut Uncut
Technology HPHT
Size 5.0-15.0mm
Shape Raw
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)


Synthetic White HPHT 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 $$$$$ $$$



Synthetic White HPHT Rough Diamonds Details


4.0ct 5.0ct Synthetic HPHT Rough White Diamonds VVS VS D F For Necklace 0

You Might Be Into These
Get in touch with us

Enter Your Message
+86 15225124915