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4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal

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4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal

4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal
4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal 4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal 4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal

Large Image :  4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal

Product Details:
Place of Origin: Zhengzhou, China
Certification: None
Model Number: YD-A+
Payment & Shipping Terms:
Minimum Order Quantity: Negotiate
Price: Negotiate
Packaging Details: Carton box
Delivery Time: 1-15 working days
Payment Terms: T/T, Western Union, PayPal, Bank Transfer
Supply Ability: 50000carats per month

4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal

Product Name: HPHT Synthetic Diamond Brand: Yuda Crystal
Grade: High Assortment: Good
Color: DEF Clarity: VVS VS SI
Carat Weight: 4-5ct Cut: Uncut
Technology: HPHT Shape: Rough, Raw
Usage: For Cutting Lab Grown 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:

5.0ct HPHT Rough Diamond 5mm


4.5ct HPHT Rough Diamond


4 ct lab grown diamond Yuda Crystal

DEF Color VVS VS SI Purity 4.0-5.0ct HPHT Rough Diamond For Cutting 2 Ct Hpht Loose Diamonds


Lab Grown Rough Diamonds Description


Synthetic Rough Diamond in laboratory exhibit the same physical, chemical and optical properties as natural diamonds, and exhibit the same flame, flicker and flash. With a jewelry magnifying glass, it is almost impossible to distinguish man-made diamonds from natural diamonds. Laboratory made diamonds may exhibit trace elements different from natural diamonds, which do not affect the appearance of diamonds. Only by using special equipment for testing, can we distinguish between laboratory grown diamonds and natural diamonds. Laboratory produced diamonds available for purchase should always carry gemstone certification to confirm that they are laboratory produced.


Laboratory produced diamonds (also known as laboratory produced diamonds, synthetic diamonds, synthetic diamonds, artificially cultivated diamonds or artificially cultivated diamonds) are synthetic diamonds that reflect natural diamonds. Because they are actually made up of carbon atoms, the diamonds grown in the laboratory show the same chemical and optical properties as natural diamond crystals produced by natural geological processes. The price of synthetic diamonds is generally lower than that of natural diamonds.

Diamonds made in the laboratory are made by copying the manufacturing process of natural diamonds.

Natural diamonds are grown by high temperature and high pressure. After millions of years, carbon atoms are transformed into beautiful and charming gemstones, which we call diamonds.

Diamonds made in the laboratory grow in the same way, only through an artificial process that takes weeks, not millions of years.

Synthetic diamonds start with a small piece of diamond, which is called diamond seed. The seed is sealed in a special chamber designed to simulate conditions inside the crust.

The surface of the seed crystal is coated with pure carbon, which will eventually be transformed into synthetic diamond with the same chemical properties as natural diamond.

There are two different methods for making diamonds in the laboratory; High pressure high temperature (HPHT) and chemical vapor deposition (CVD).

High temperature and high pressure exert intense heat (about 1500 degrees Celsius, or 2700 degrees Fahrenheit) and pressure (1.5 million pounds per square inch) on the diamond seed and the carbon atoms surrounding it. Chemical vapor deposition, on the other hand, uses less heat and pressure, but introduces a mixture of chemical gases, which decomposes and hardens into crystalline carbon atoms.

The results of the two methods are the same; A man-made diamond, made from scratch in a few weeks.


Parameters of Lab Grown Rough Diamonds

HPHT Lab Grown Diamonds Details
Brand Name Yuda Crystal
Name Rough Lab Grown Diamonds
Diamond Color D-F
Diamond Clarity VVS-SI
Diamond Carat Weight 4.0-5.0 carat
Diamond Cut Uncut
Technology HPHT
Size 5mm-15mm
Shape Raw
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)


Lab Grown Rough Diamonds Introduction

HPHT is the abbreviation for high temperature and high pressure treatment, and its purpose is to change or improve the natural body color of certain types of diamonds to make them more valuable.

In the past, it was called Pegasus diamond and GE POL diamond. The reason why it is called GE Diamond is because The technology developed by GE in the United States is a new product exclusively sold by POL, a subsidiary of Israel's LKI, in 1999.

HPHT technology is to process natural diamonds at high temperature and high pressure to enhance the color grade of diamonds. In one move, it can be upgraded to 4-6 levels. However, not every diamond can be processed by this technology. It must have a J color or higher, and be free of impurities and high-clarity quality. During processing, the results cannot be predicted. In other words, it is not certain what level it can be promoted to.

At the same time, diamonds treated with HPHT may deepen or change in color to become a colored diamond.


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 $$$$$ $$$


Lab Grown Rough Diamonds Details


4.0ct 4.5ct 5.0ct HPHT Rough Diamond 5mm To 15mm Yuda Crystal 0

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