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Questions and Answers
What is the name of the grossular species that has a transparent orange to cinnamon-colored variety?
What is the name of the grossular species that has a transparent orange to cinnamon-colored variety?
- Tsavorite
- Rhodolite
- Demantoid
- Hessonite (correct)
Which of the following is a characteristic of garnet and spinel?
Which of the following is a characteristic of garnet and spinel?
- Singly refractive (correct)
- Pleochroic
- Triply refractive
- Doubly refractive
What is the most valuable red garnet?
What is the most valuable red garnet?
- Almandine
- Spessartine
- Pyrope
- Rhodolite (correct)
What is the primary source of rhodolite since the 1960s?
What is the primary source of rhodolite since the 1960s?
What is the color of tsavorite?
What is the color of tsavorite?
What is the coloring agent of color-change garnets?
What is the coloring agent of color-change garnets?
What is the variety of andradite that is colored by a mixture of chromium and iron?
What is the variety of andradite that is colored by a mixture of chromium and iron?
What is the characteristic of many garnets?
What is the characteristic of many garnets?
Why are huge numbers of dark-toned, reddish brown, calibrated pyrope-almandine garnets used in inexpensive, mass-market jewelry?
Why are huge numbers of dark-toned, reddish brown, calibrated pyrope-almandine garnets used in inexpensive, mass-market jewelry?
What is the origin of tsavorite?
What is the origin of tsavorite?
What is the reason cutters do not need to consider pleochroism when working with garnet and spinel?
What is the reason cutters do not need to consider pleochroism when working with garnet and spinel?
What is the common characteristic of most red garnets, including rhodolite?
What is the common characteristic of most red garnets, including rhodolite?
What is the primary characteristic used to classify garnets?
What is the primary characteristic used to classify garnets?
What is the significance of East Africa in the context of rhodolite?
What is the significance of East Africa in the context of rhodolite?
Why are tsavorite and color-change garnets valuable?
Why are tsavorite and color-change garnets valuable?
What is the significance of spinel in the history of gemology?
What is the significance of spinel in the history of gemology?
What is the characteristic of demantoid?
What is the characteristic of demantoid?
Why are pyrope-almandine garnets used in inexpensive, mass-market jewelry?
Why are pyrope-almandine garnets used in inexpensive, mass-market jewelry?
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Study Notes
Garnet
- Hessonite is a transparent orange to cinnamon-colored variety of the grossular species of garnet.
- Garnet is singly refractive, eliminating the need for cutters to consider pleochroism.
- Most red garnets, including the popular rhodolite, are mixtures of pyrope and almandine.
- Rhodolite is the most valuable red garnet, characterized by a dark purplish red to light reddish purple hue.
- Garnets can be a mixture of two or more garnet species.
- Gemologists classify garnets by their physical and optical properties.
Spinel
- Historically, many red gems identified as ruby were recognized as spinel in the 1800s.
Tsavorite
- Tsavorite is a type of garnet colored by vanadium, with the best quality being pure green or green with a slight amount of blue.
- Tsavorite is mostly mined in East Africa.
- Large tsavorite rough is extremely rare, resulting in a significant increase in value between small and large fashioned stones.
Demantoid
- Demantoid is the transparent green variety of andradite, colored by a mixture of chromium and iron.
Garnet Trade
- East Africa has been the most important source of rhodolite since the 1960s.
- Many dealers sell garnets based on color or origin, rather than physical and optical properties.
- Huge numbers of dark-toned, reddish brown, calibrated pyrope-almandine garnets are used in inexpensive, mass-market jewelry.
Garnet
- Hessonite is a transparent orange to cinnamon-colored variety of the grossular species of garnet.
- Garnet is singly refractive, eliminating the need for cutters to consider pleochroism.
- Most red garnets, including the popular rhodolite, are mixtures of pyrope and almandine.
- Rhodolite is the most valuable red garnet, characterized by a dark purplish red to light reddish purple hue.
- Garnets can be a mixture of two or more garnet species.
- Gemologists classify garnets by their physical and optical properties.
Spinel
- Historically, many red gems identified as ruby were recognized as spinel in the 1800s.
Tsavorite
- Tsavorite is a type of garnet colored by vanadium, with the best quality being pure green or green with a slight amount of blue.
- Tsavorite is mostly mined in East Africa.
- Large tsavorite rough is extremely rare, resulting in a significant increase in value between small and large fashioned stones.
Demantoid
- Demantoid is the transparent green variety of andradite, colored by a mixture of chromium and iron.
Garnet Trade
- East Africa has been the most important source of rhodolite since the 1960s.
- Many dealers sell garnets based on color or origin, rather than physical and optical properties.
- Huge numbers of dark-toned, reddish brown, calibrated pyrope-almandine garnets are used in inexpensive, mass-market jewelry.
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