GIA COLORED STONES UPDATED ACTUAL
TESTBANK 2026 COMPLETE SET 1129
QUESTIONS WITH ACCURATE DETAILED
SOLUTIONS GRADED A+
⩥ Garnet crystal system. Answer: Cubic.
⩥ Common garnet crystal habit. Answer: Dodecahedron.
⩥ How gemologists classify garnets. Answer: By physical/optical
properties (and to some extent color) to identify species/mixtures.
⩥ How dealers often sell garnets. Answer: By color or origin/trade
variety names (e.g., rhodolite, tsavorite, "African," "Mozambique,"
"mandarin").
⩥ Commercially important gem garnet species (5). Answer: Pyrope,
Almandine, Spessartine, Grossular, Andradite.
⩥ Sixth green garnet (limited commercial importance). Answer:
Uvarovite (usually crystals too small to cut; sometimes used in clusters).
, ⩥ Isomorphous replacement. Answer: Substitution of one chemical
element for another in a mineral's crystal structure; enables garnet
species mixing.
⩥ Why many garnets are mixtures. Answer: Elements (e.g., Mg and Fe)
can substitute in the garnet structure, creating intermediate compositions
with varying properties.
⩥ Most mixing occurs within which sets?. Answer: Within aluminum
garnets (pyrope-almandine-spessartine) more than between aluminum
and calcium garnets.
⩥ Aluminum garnets set. Answer: Pyrope, Almandine, Spessartine.
⩥ Calcium garnets set. Answer: Grossular, Andradite, Uvarovite.
⩥ Rhodolite. Answer: Trade variety name for a purplish red garnet that
is a mixture of pyrope and almandine.
⩥ Malaya. Answer: Trade term for pinkish to reddish orange garnet;
mixture of pyrope and spessartine with a small amount of almandine.
⩥ Mandarin garnet. Answer: Trade name used for vibrant orange
spessartine from Africa (especially promoted in the 1990s).
TESTBANK 2026 COMPLETE SET 1129
QUESTIONS WITH ACCURATE DETAILED
SOLUTIONS GRADED A+
⩥ Garnet crystal system. Answer: Cubic.
⩥ Common garnet crystal habit. Answer: Dodecahedron.
⩥ How gemologists classify garnets. Answer: By physical/optical
properties (and to some extent color) to identify species/mixtures.
⩥ How dealers often sell garnets. Answer: By color or origin/trade
variety names (e.g., rhodolite, tsavorite, "African," "Mozambique,"
"mandarin").
⩥ Commercially important gem garnet species (5). Answer: Pyrope,
Almandine, Spessartine, Grossular, Andradite.
⩥ Sixth green garnet (limited commercial importance). Answer:
Uvarovite (usually crystals too small to cut; sometimes used in clusters).
, ⩥ Isomorphous replacement. Answer: Substitution of one chemical
element for another in a mineral's crystal structure; enables garnet
species mixing.
⩥ Why many garnets are mixtures. Answer: Elements (e.g., Mg and Fe)
can substitute in the garnet structure, creating intermediate compositions
with varying properties.
⩥ Most mixing occurs within which sets?. Answer: Within aluminum
garnets (pyrope-almandine-spessartine) more than between aluminum
and calcium garnets.
⩥ Aluminum garnets set. Answer: Pyrope, Almandine, Spessartine.
⩥ Calcium garnets set. Answer: Grossular, Andradite, Uvarovite.
⩥ Rhodolite. Answer: Trade variety name for a purplish red garnet that
is a mixture of pyrope and almandine.
⩥ Malaya. Answer: Trade term for pinkish to reddish orange garnet;
mixture of pyrope and spessartine with a small amount of almandine.
⩥ Mandarin garnet. Answer: Trade name used for vibrant orange
spessartine from Africa (especially promoted in the 1990s).
