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Which element causes red in Ruby and Green in Emerald? |
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Which type of twinning is caused by enviromental change after the gem forms? |
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Which type of twinning looks as if two crystal halves are mirror images? |
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Sapphire's color change is caused by |
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The most common # of rays in Star Sapphire |
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Th 1st flame-fusion Star Rubies were produced in the |
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Which is the most prised bodycolor in Star Corrundum? |
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What causes the Pink color Corundum? |
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Which Fancy Sapphire hue regularly commands top prices? |
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Which color Sapphireis usually cut shallow due to parting? |
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A major source of Black Sapphire.
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The name padparadscha means |
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What's a common trade name for intensely saturated, light to medium pinkish orange to orange-pink sapphires? |
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Color-change sapphire typically changes from blue or violet to |
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Asterism in black star sapphirenis caused by |
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Which is the most prized bodycolor in star corundum? |
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Fancy sapphires from Montana tend to be |
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Essence d'orient is a mixture of |
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Largest gem-quality natural pearl |
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Tahitian cultured pearls with a dark green-grey, blue-grey rosé purple overtones |
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What happens when saltwater cultured pearls are exposed to gamma rays? |
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Narce quality classification "Nucleus not noticable, no chalky apperance." |
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the matching level that describes a group of pearls that have minor variations in uniformity is |
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Aragonite is a crystalized form of |
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By ____Kokichi Mikimoto begun cultivating whole pearls |
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was the 1st South Sea Farm |
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Saltwater-mantle tissue piece and a bead nucleus |
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Freshwater-mantle tissue peice only |
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Japanesse pearls die off in massive numbers |
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South Sea cultured pearls are produced principally in Australia, Indonesia and |
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Which element does chormium substitute for Ruby's red? |
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A gem colored by an element that's part of it's basic chemistry is called |
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which element causes the color of both almandite and peridot? |
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The process where electrons selectively absorb light are passed back and forth between neighboring imputiy ions is known as |
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Which components of a transition elements atoms can produce color in gems? |
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When a gems crystal structure splits into two rays that each travel at slightly different speeds and direction, it's called |
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| A gem produced by, or derived from, a living organism is |
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| Which of the following is an organic gem? |
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| A substance that consists of atoms of only one kind is a |
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| A natural, inorganic substance with a chemical composition and usually characteristic crystal structure is a |
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| Which of the following is amorphous |
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| A broad gem category based on chemical composition and crystal structure is a |
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| Which of the following is a gem variety? |
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| Which group does almandite belong to? |
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| The worlds largest gem consuming market is |
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| Compared to the domestic market for diamonds, the US domestic market for natural, unset, non-diamond gem is |
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| To be a gem a mineral must be beautiful, durable, and |
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| Many colored stones are mined by |
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| independent miners using small-scale mining methods. |
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| Media attention in the 1990's regarding it's treatment reduced consumer confidence in |
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| Most gemstones form in the |
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| Rocks altered by heat and pressure are |
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| Which gem can crystalize in volcanic rock from gases released by magma? |
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| Which is a key locality for hydrothermal gems |
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| Which gem forms by metamorphism? |
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| Heat and pressure form limestone into |
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| A deposit where gems are found in the rock that carried them to the earth's surface is called |
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| Which type of deposit usually the most profitable for colored stone mining? |
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| Which is a deposit where gems eroded from the source rock and remained in place nearby? |
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| Which is a workable alluvial deposit of gem minerals with economic potential? |
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| Kunzite is most often found in association with |
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Definition
| tourmaline and beryl in pegmatite |
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| Myanmar's famous Mogok ruby deposits were formed by |
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| Pegmatite gems are rich in volatile elements like |
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Definition
| beryllium, boron and lithium |
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| Most of the gems in Tanzania's Umba River Valley are found in |
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| Emeralds are rarely found in placer deposits because they're |
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| unable to withstand much abraision. |
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| A unit cell defines a mineral's |
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| If a crystal grows in a flux that is highly saturated with the neccessary elements, it tends to be |
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| Which aggregate's crystals are visible only with a magnification greater then a standard gemological microscope's? |
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| Which is classified in the orthorhombic crystal system? |
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| Which type of twinning is caused by enviromental change after the gem forms? |
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| Needles of actinolite found in emerald are classified as |
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| A two-phase inclusion is a cavity in a gem that's typically filled with a |
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| Atoms in a gem that are not part of it's essential chemical composition are |
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| The trace elements that cause corrundum's blue are |
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| An object's weight in relation to it's size is called it's |
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| Which gems are cryptocrystalline aggregates? |
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Definition
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| Rough spinel often occurs as |
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Definition
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| Many fasioned rubies have shallow proportions because they are cut fom |
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Definition
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| The pattern of dark vertical lines or bands shown by certain gems when viewed through a spectroscope is called |
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Definition
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| Which element does chromium substitute for to cause ruby's red? |
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Definition
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Term
| What element causes the color of both almandite and peridot? |
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Definition
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Term
| The process where electrons that selectively absorb light are passed back and forth between neighboring impurity ions is known as |
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Definition
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Term
| Which components of a transition element's atoms can produce color in gems? |
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Definition
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Term
| Which element causes the finest reds and greens in gemstones? |
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Definition
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| Which transition element causes a greater variety of gem colors then any other? |
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Definition
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| In many blue sapphires,the intervalence charge transfer that causes the color is between |
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Definition
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| When a gem's crystal structure splits light into two rays that each travel at a slightly different speed and direction, it's called |
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Definition
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| What is the only type of gem that shows pleochroism? |
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Definition
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| Which gem can show three pleochroic colors? |
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Definition
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| Which phenomenon is a broad flash of color? |
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Definition
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| Adularescence is caused by |
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| The best-known and most valuable chatoyant gem is called cat's-eye |
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| A laboratory-created gem with essentially the same chemical composition, crystal structure, and proportions as it's natural counterpart is a |
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Definition
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| The two main types of processes for synthetic gem production are melt and |
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Definition
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| Low cost and high volume characterize which process? |
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| Which synthetic process developed rapidly due to laser research in the 1960's? |
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