Henan Yuda Crystal Co.,Ltd
| Payment Terms | 100% Payment In Advance |
| Supply Ability | 50000carats per month |
| Delivery Time | 1-15 Working Days Depends On Quantity |
| Packaging Details | Carton box |
| Product Name | CVD Lab Grown Diamonds |
| Brand | Yuda Crystal |
| Grade | High |
| Assortment | Good |
| Color | DEF |
| Clarity | VVS VS |
| Carat Weight | 7.0-12.0ct |
| 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 Mode | T/T, Bank Transfer, PayPal, Western Union |
| 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 |
| Brand Name | YUDA CRYSTAL |
| Model Number | YD-A+ |
| Certification | None |
| Place of Origin | Zhengzhou, China |
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Product Specification
| Payment Terms | 100% Payment In Advance | Supply Ability | 50000carats per month |
| Delivery Time | 1-15 Working Days Depends On Quantity | Packaging Details | Carton box |
| Product Name | CVD Lab Grown Diamonds | Brand | Yuda Crystal |
| Grade | High | Assortment | Good |
| Color | DEF | Clarity | VVS VS |
| Carat Weight | 7.0-12.0ct | 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 Mode | T/T, Bank Transfer, PayPal, Western Union |
| 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 |
| Brand Name | YUDA CRYSTAL | Model Number | YD-A+ |
| Certification | None | Place of Origin | Zhengzhou, China |
| High Light | CVD Rough Diamond 7.0ct ，10mm CVD Rough diamond ，raw rough diamond 12.0ct | ||
Rectangular Shape 8mm - 10mm DEF Color Raw CVD Lab Rough Dimonds For Cvd Diamond Jewelry
CVD Lab Grown Diamonds Description
High temperature and high pressure (HPHT) and chemical vapor deposition (CVD) are the two most commonly used growth methods in lab grown diamonds industrial.
Specifically, the lab grown 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 grow up just like the seed. Therefore, this method is also called seed temperature gradient method.
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.
Generally, after more than ten hours, the growth of lab grown diamonds is completed. However, at this time, the lab grown 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).
Parameters of CVD Lab Grown Diamonds
| CVD Rough Diamonds Details | |
| Brand Name | Yuda Crystal |
| Name | CVD Rough Diamonds |
| Diamond Color | D-F |
| Diamond Clarity | VVS-VS |
| Diamond Carat Weight | 7.0-12.0carat |
| 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
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Agent,Exporter,Seller
Year Established:
2016
Total Annual:
50 Million-200 Million
Employee Number:
10~50
Ecer Certification：
Verified Supplier
Yuda Crystal is one of the world's leading lab grown diamond companies, mainly active in fields: Gem quality lab grown rough(Including HPHT and CVD) diamonds manufacturing and wholesale, lab grown polish diamonds manufacturing and wholesale, Industrial grade HPHT and CVD lab grown diamonds ... Yuda Crystal is one of the world's leading lab grown diamond companies, mainly active in fields: Gem quality lab grown rough(Including HPHT and CVD) diamonds manufacturing and wholesale, lab grown polish diamonds manufacturing and wholesale, Industrial grade HPHT and CVD lab grown diamonds ...
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