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 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.

Synthetic White HPHT Rough Diamonds Details