![](https://i2.wp.com/yourdiamondteacher.com/wp-content/uploads/2015/02/Natural-vs-treated-fancy-colored-diamonds.jpg)
Hpht Color Enhanced Natural Diamond
Hpht Color Enhanced Natural Diamond. Hpht (high pressure high temperature) treatment can be used to enhance the color grade of brownish or grayish type iia diamonds to colorless or near colorless. Pros of hpht enhanced ....