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Questions and Answers
What is the purpose of flux in gemstone treatment?
What is the purpose of flux in gemstone treatment?
- To lighten or remove color from a gemstone
- To dissolve another compound at a lower temperature than its own melting point (correct)
- To seal a fracture or cavity in a gemstone
- To add color or affect color by deepening it
What is the result of quench crackling on a gemstone?
What is the result of quench crackling on a gemstone?
- It produces fractures in a stone so it will accept dye (correct)
- It heals fractures and cavities in a gemstone
- It removes imperfections in a gemstone
- It adds color or affects color by deepening it
What is the purpose of clarity enhancement treatment?
What is the purpose of clarity enhancement treatment?
- To add color or affect color by deepening it
- To lighten or remove color from a gemstone
- To improve the apparent clarity of a gem with a colorless or near-colorless filler (correct)
- To seal a fracture or cavity in a gemstone
What is geuda?
What is geuda?
What is the purpose of resin in gemstone treatment?
What is the purpose of resin in gemstone treatment?
What happens to a gemstone during heat treatment in an oxidizing environment?
What happens to a gemstone during heat treatment in an oxidizing environment?
What is the purpose of dyeing in gemstone treatment?
What is the purpose of dyeing in gemstone treatment?
What is sugar treatment used for in opal treatment?
What is sugar treatment used for in opal treatment?
What is the purpose of fracture filling in gemstone treatment?
What is the purpose of fracture filling in gemstone treatment?
What is the purpose of bleaching in gemstone treatment?
What is the purpose of bleaching in gemstone treatment?
Which treatment is used to lighten or remove color from a gemstone?
Which treatment is used to lighten or remove color from a gemstone?
What type of environment surrounds a gem during heat treatment, causing certain color-causing trace elements to gain electrons?
What type of environment surrounds a gem during heat treatment, causing certain color-causing trace elements to gain electrons?
What is the purpose of filling fractures or openings with melted wax, resin, polymer, or plastic?
What is the purpose of filling fractures or openings with melted wax, resin, polymer, or plastic?
What is the result of rapid heating and cooling of a gemstone?
What is the result of rapid heating and cooling of a gemstone?
What is the purpose of resin in gemstone treatment?
What is the purpose of resin in gemstone treatment?
What is the result of heat treatment in a reducing environment?
What is the result of heat treatment in a reducing environment?
What is the purpose of colorless impregnation?
What is the purpose of colorless impregnation?
What is a a liquid filling material that is very durable when it dries?
What is a a liquid filling material that is very durable when it dries?
What treatment involves heating a wrapped opal until smoke or ash penetrates its surface to darken it and bring out its play-of-color?
What treatment involves heating a wrapped opal until smoke or ash penetrates its surface to darken it and bring out its play-of-color?
What treatment has a oxygen rich environment that surrounds a gem during the heat treatment , cause certain color-causing trace elements to lose electrons?
What treatment has a oxygen rich environment that surrounds a gem during the heat treatment , cause certain color-causing trace elements to lose electrons?
What type of heat treatment in the presence of flux that results in the sealing of a fracture or cavity?
What type of heat treatment in the presence of flux that results in the sealing of a fracture or cavity?
What is a human controlled process, beyond surface treatment, improves the appearance durability and value of a gem?
What is a human controlled process, beyond surface treatment, improves the appearance durability and value of a gem?
Which gem treatment exposes a gem to high temperatures and chemicals to allow penetration and color-causing elements ?
Which gem treatment exposes a gem to high temperatures and chemicals to allow penetration and color-causing elements ?
What process alters a gems appearance by applying backings, coatings, and coloring agents?
What process alters a gems appearance by applying backings, coatings, and coloring agents?
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Study Notes
Gemstone Treatment Terms
- Bleaching: a treatment that uses chemicals to lighten or remove color from a gemstone
- Oxidizing environment: an oxygen-rich environment that causes certain color-causing trace elements to lose electrons during heat treatment
- Clarity enhancement: a treatment that improves the apparent clarity of a gem with a colorless or near-colorless filler
- Polymer: a liquid filling material that is very durable when it dries
- Colorless impregnation: filling of pores or openings with melted wax, resin, polymer, or plastic to improve appearance and stability
Gemstone Treatment Processes
- Quench crackling: a rapid heating and cooling process that produces fractures in a stone so it will accept dye
- Dyeing: a treatment that adds color or affects color by deepening it, making it more even, or changing it
- Reducing environment: an oxygen-poor environment that surrounds a gem during heat treatment, causing certain color-causing trace elements to gain electrons
- Flux: a compound that can dissolve another compound at a lower temperature than its own melting point
- Flux healing: heat treatment in the presence of a flux that results in the sealing of a fracture or cavity
- Resin: a clear, viscous substance used to fill fractures in gemstones
- Fracture (fissure) filling: use of a colorless to near-colorless filler to conceal fractures and improve the apparent clarity of a gem
Specific Gemstone Treatments
- Geuda: milky, grayish, or brownish corundum that can be treated to a fine blue color
- Smoke treatment: heating a wrapped opal until smoke or ash penetrates its surface to darken it and bring out its play-of-color
- Sugar treatment: soaking an opal in a hot sugar solution
Gemstone Treatment Terms
- Bleaching: a treatment that uses chemicals to lighten or remove color from a gemstone
- Oxidizing environment: an oxygen-rich environment that causes certain color-causing trace elements to lose electrons during heat treatment
- Clarity enhancement: a treatment that improves the apparent clarity of a gem with a colorless or near-colorless filler
- Polymer: a liquid filling material that is very durable when it dries
- Colorless impregnation: filling of pores or openings with melted wax, resin, polymer, or plastic to improve appearance and stability
Gemstone Treatment Processes
- Quench crackling: a rapid heating and cooling process that produces fractures in a stone so it will accept dye
- Dyeing: a treatment that adds color or affects color by deepening it, making it more even, or changing it
- Reducing environment: an oxygen-poor environment that surrounds a gem during heat treatment, causing certain color-causing trace elements to gain electrons
- Flux: a compound that can dissolve another compound at a lower temperature than its own melting point
- Flux healing: heat treatment in the presence of a flux that results in the sealing of a fracture or cavity
- Resin: a clear, viscous substance used to fill fractures in gemstones
- Fracture (fissure) filling: use of a colorless to near-colorless filler to conceal fractures and improve the apparent clarity of a gem
Specific Gemstone Treatments
- Geuda: milky, grayish, or brownish corundum that can be treated to a fine blue color
- Smoke treatment: heating a wrapped opal until smoke or ash penetrates its surface to darken it and bring out its play-of-color
- Sugar treatment: soaking an opal in a hot sugar solution
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