CDG Diamond Treatments & Enhancements Flashcards

What does HPHT stand for in the context of diamond treatment?

Answer: High Pressure High Temperature

HPHT stands for High Pressure High Temperature, a treatment that mimics natural diamond formation conditions to alter color.

HPHT treatment is primarily used to accomplish which of the following?

Answer: Improve or change the color of diamonds

HPHT treatment is primarily used to improve or change diamond color, often converting brown or near-colorless stones to colorless or fancy colored.

Which spectroscopic method is most reliable for detecting HPHT treatment in diamonds?

Answer: Infrared (FTIR) and UV-Vis spectroscopy

FTIR and UV-Vis spectroscopy reveal characteristic absorption patterns in HPHT-treated diamonds not present in untreated stones.

Irradiation treatment of diamonds most commonly produces which colors?

Answer: Blue, green, or fancy yellow

Irradiation creates or modifies color centers within the crystal lattice, typically producing blue, green, or fancy yellow colors.

What is the primary consumer safety concern with certain irradiation treatment methods?

Answer: Residual radioactivity in some treatment methods

Some irradiation methods can leave residual radioactivity in diamonds, requiring monitoring and clearance before sale to consumers.

Type IIa diamonds are most commonly targeted for HPHT treatment because they:

Answer: Contain no nitrogen and respond well to color improvement

Type IIa diamonds contain essentially no nitrogen impurities and respond well to HPHT treatment, frequently converting from brownish to colorless.