DCA Diamond Treatments & Enhancements

Question 1

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

Accepted Answer

High Pressure High Temperature

Answer

High Polish Heat Treatment

Answer

Hydrothermal Process Heat Transfer

Answer

Hardness Purity Hue Testing

Question 2

Which diamond treatment is specifically used to remove or reduce the visibility of dark inclusions?

Accepted Answer

Laser drilling

Answer

Fracture filling

Answer

HPHT treatment

Answer

Surface coating

Question 3

What material is most commonly injected into a diamond during fracture filling?

Accepted Answer

Glass-like substance with similar refractive index

Answer

Epoxy resin

Answer

Liquid nitrogen

Answer

Silicone sealant

Question 4

How does laser drilling typically affect a diamond's clarity grade on a GIA grading report?

Accepted Answer

The report notes 'laser drill hole' as a clarity characteristic

Answer

It is not disclosed and has no effect on the grade

Answer

The diamond is automatically downgraded two grades

Answer

The report lists it as a natural inclusion

Question 5

HPHT treatment is most commonly used on which category of diamonds to improve their appearance?

Accepted Answer

Brown or near-colorless diamonds with nitrogen defects

Answer

Fancy colored yellow diamonds

Answer

Included diamonds with visible fractures

Answer

Heavily fluorescent blue diamonds

Question 6

Which industry body requires mandatory disclosure of all diamond treatments to consumers?

Accepted Answer

The Federal Trade Commission (FTC)

Answer

The Federal Reserve

Answer

The American Gem Society (AGS) only

Answer

The Diamond Producers Association

Question 7

What is the primary concern with fracture-filled diamonds when a customer brings jewelry in for repair?

Accepted Answer

High heat from torch work can damage or destroy the filler material

Answer

The filler makes the diamond more brittle and prone to chipping

Answer

The filler causes the diamond to lose weight over time

Answer

Ultrasonic cleaners permanently bond the filler to the host diamond