DCA Diamond Treatments & Enhancements 2

Question 1

Which of the following diamond colors can be produced through irradiation treatment?

Accepted Answer

A wide range including blue, green, yellow, and pink

Answer

Irradiation can produce a variety of fancy colors including blue, green, yellow, orange, and pink by altering the diamond's crystal lattice.

Question 2

Under magnification, how can a gemologist detect laser drilling in a diamond?

Accepted Answer

By finding a thin white tunnel or channel leading to a dark inclusion

Answer

Laser drill holes appear as thin, worm-like or straight tunnels visible under magnification, often leading from the surface to a dark inclusion.

Question 3

Which characteristic of a fracture-filled diamond may change over time or with exposure to chemicals?

Accepted Answer

The apparent clarity improvement from the filler

Answer

The glass-like filler can be damaged by heat, chemicals, or ultrasonic cleaning, causing the treated fractures to become visible again.

Question 4

The Yehuda process is a well-known proprietary method for which type of diamond treatment?

Accepted Answer

Fracture filling

Answer

The Yehuda process, developed by Zvi Yehuda, is one of the most recognized fracture-filling techniques using a proprietary glass-like substance.

Question 5

Which type of diamond treatment is generally considered permanent and does NOT require ongoing disclosure concerns about stability?

Accepted Answer

Laser drilling

Answer

Laser drilling creates a permanent physical alteration to the diamond's structure, unlike coatings or fillers that can degrade or be removed.

(DCA) Certified Diamond Council of America Diamond Specialist Practice Test