Podcast
Questions and Answers
What is the purpose of annealing in diamond treatment?
What is the purpose of annealing in diamond treatment?
- To change the diamond's color through irradiation
- To improve a diamond's marketability (correct)
- To enhance the diamond's clarity through fracture filling
- To permanently remove inclusions from the diamond
What characteristic is reported by major gem labs as a result of laser drilling?
What characteristic is reported by major gem labs as a result of laser drilling?
- The presence of deep inclusions
- Refractive index variations
- New cleavages created by the laser
- Permanent clarity characteristics (correct)
What result does irradiation usually produce in type I diamonds?
What result does irradiation usually produce in type I diamonds?
- A colorless appearance
- A blue to green bodycolor (correct)
- An orange bodycolor
- A pink bodycolor
Which of the following indicates that a diamond has undergone fracture filling?
Which of the following indicates that a diamond has undergone fracture filling?
What happens to the bodycolor of diamonds after HPHT treatment?
What happens to the bodycolor of diamonds after HPHT treatment?
What is a critical disclosure requirement in the diamond industry?
What is a critical disclosure requirement in the diamond industry?
What effect does annealing have on diamonds post-irradiation?
What effect does annealing have on diamonds post-irradiation?
What is the main consequence of laser drilling on a diamond's appearance?
What is the main consequence of laser drilling on a diamond's appearance?
Which type of diamond is likely to produce a pink bodycolor after irradiation and annealing?
Which type of diamond is likely to produce a pink bodycolor after irradiation and annealing?
How do gemological laboratories assess the color origin of diamonds?
How do gemological laboratories assess the color origin of diamonds?
A controlled heating and cooling process is called ?
A controlled heating and cooling process is called ?
Formation of graphite around a diamond’s mineral inclusions and feathers that results from the extreme conditions of HPHT treatment is...........
Formation of graphite around a diamond’s mineral inclusions and feathers that results from the extreme conditions of HPHT treatment is...........
A clarity treatment that uses a laser focused on or near an inclusion to enlarge existing cleavages or create new ones, providing a path for a bleaching solution to dissolve the inclusion is .....
A clarity treatment that uses a laser focused on or near an inclusion to enlarge existing cleavages or create new ones, providing a path for a bleaching solution to dissolve the inclusion is .....
Spaces in the regular framework of atoms that are usually uninhabited is ......
Spaces in the regular framework of atoms that are usually uninhabited is ......
The definition of Irradiation is....?
The definition of Irradiation is....?
Laser drilling can make a diamond ........
Laser drilling can make a diamond ........
Fracture filling makes a diamond’s ......
Fracture filling makes a diamond’s ......
Irradiated diamond color can change if the diamond is .......
Irradiated diamond color can change if the diamond is .......
The color resulting from irradiation can vary based on ......
The color resulting from irradiation can vary based on ......
Irradiation and subsequent annealing of a type Ia diamond creates........
Irradiation and subsequent annealing of a type Ia diamond creates........
HPHT color treatment of diamonds uses the same equipment as HPHT diamond growth, but ....
HPHT color treatment of diamonds uses the same equipment as HPHT diamond growth, but ....
All diamonds need what after HPHT treatment because of the high temperatures and pressures?
All diamonds need what after HPHT treatment because of the high temperatures and pressures?
HPHT processing of type Ia diamonds can enhance color by ........
HPHT processing of type Ia diamonds can enhance color by ........
Some treaters use what treatments to achieve the desired bodycolor?
Some treaters use what treatments to achieve the desired bodycolor?
HPHT treatment of type II diamonds can enhance color by ....
HPHT treatment of type II diamonds can enhance color by ....
What were one of the earliest methods of diamond color modification?
What were one of the earliest methods of diamond color modification?
Modern silica coatings are fairly durable ........
Modern silica coatings are fairly durable ........
Flashcards
Annealing
Annealing
A controlled heating and cooling process used for diamonds.
Graphitization
Graphitization
The formation of graphite from diamond inclusions during high pressure/high temperature (HPHT) treatment.
Laser Drilling
Laser Drilling
Using a laser beam to modify or eliminate inclusions in a diamond.
Internal Laser Drilling
Internal Laser Drilling
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Irradiation
Irradiation
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Fracture Filling
Fracture Filling
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HPHT Treatment
HPHT Treatment
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Type I Diamond Irradiation
Type I Diamond Irradiation
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Type Ia Diamond Irradiation
Type Ia Diamond Irradiation
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Type Ib Diamond Irradiation
Type Ib Diamond Irradiation
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Study Notes
Annealing and Graphitization
- Annealing is a controlled heating and cooling process.
- Graphitization forms graphite around diamond inclusions from high-pressure, high-temperature (HPHT) treatment.
Laser Drilling
- Laser drilling improves diamond appearance by targeting inclusions.
- It enlarges existing cleavages or creates new ones to dissolve inclusions.
- Interstitial positions are spaces in a diamond's regular atomic structure.
Irradiation
- Irradiation exposes a diamond to radiation.
- It can change a diamond's color based on existing defects.
- Type I diamonds irradiated become blue to green.
- Subsequent annealing can further change the body color of a diamond.
- Type Ia diamonds become yellow, orangy yellow, yellow-green, or brown.
- Type Ib diamonds are pink.
Fracture Filling
- Fracture filling reduces visibility of fractures and cleavages with high-refractive-index (high-RI) glass.
- Signs include flash effect, trapped gas bubbles, flow structure, and crackle texture.
Diamond Color Modification
- Disclosure of fracture filling is required information in diamonds.
- Heat exposure (during repairs, recutting, or repolishing) can change irradiated diamond color.
- HPHT treatment can rearrange defects in the crystal lattice.
- HPHT treatment needs repolishing due to high temperatures and pressures.
- HPHT treatment of Type Ia diamonds enhances color by rearranging vacancies and nitrogen.
- HPHT treatment of Type II diamonds removes vacancy clusters to reduce brown and gray coloration.
- Combination treatments improve desired body color.
- Coatings were early methods, though modern silica coatings are durable but not permanent.
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Description
Explore the various processes involved in diamond treatments, including annealing, graphitization, laser drilling, and irradiation. Understand how these techniques enhance diamond appearance and alter their properties. Learn about the effects of fracture filling and the visual indicators of treated diamonds.
