CDG CDG Diamond Treatments & Enhancements

Question 1

What substance is most commonly used in fracture filling of diamonds?

Accepted Answer

Lead glass (high lead-content glass)

Answer

Epoxy resin

Answer

Silicone

Answer

Acrylic

Question 2

Which of the following is the most telltale sign of fracture filling when viewed under magnification?

Accepted Answer

Rainbow flash effect (iridescent color flash)

Answer

Increased fluorescence

Answer

Surface graining

Answer

Bearding along the girdle

Question 3

How does fracture filling affect a diamond's apparent clarity grade?

Accepted Answer

It can improve the apparent clarity by several grades

Answer

It has no effect on clarity grade

Answer

It always lowers the clarity grade

Answer

It only affects the color grade

Question 4

Which organization requires disclosure of fracture filling and will not grade treated diamonds on standard reports?

Accepted Answer

GIA (Gemological Institute of America)

Answer

BBB (Better Business Bureau)

Answer

FTC (Federal Trade Commission) only

Answer

Disclosure is optional per any authority

Question 5

What happens to fracture-filled diamonds when exposed to heat during jewelry repair?

Accepted Answer

The filler can melt, boil, or be expelled, damaging the treatment

Answer

The filler becomes more permanent

Answer

The filler turns the diamond yellow

Answer

Nothing — the filler is fully heat resistant

Question 6

Fracture filling in diamonds is best detected using which lighting technique?

Accepted Answer

Darkfield illumination combined with fiber-optic lighting

Answer

UV fluorescence alone

Answer

Loupe examination in direct sunlight

Answer

Specific gravity measurement