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GIA Colored Stones (1)
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GIA Colored Stones (1)
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GIA Colored Stones"king of precious stones". - ANS-In ancient Sanskrit, ruby is called ratnaraj or
"Paraiba" - ANS-Which trade term describes certain tourmalines ?
$1.16 - ANS-If a parcel of amethysts contains 1,000 stones and weighs a total of
1,542.00 cts. with a cost of $0.75 per carat, what is the unit price ?
$3,000.00 - ANS-If an emerald weighs 3.50 carats and the stone's cost is $10,500.00,
what is its per-carat price ?
$30,500.00 - ANS-If a parcel of sapphires weighs 382.00 cts. and the per-carat price is
$80.00, what is the total cost of the parcel ?
$31,600.00 - ANS-What is the cost of a ruby that weighs 5.76 cts. and has a per-carat
price of $5,500.00 ?
0.01mm to 0.50mm - ANS-How deep is the color layer that lattice-diffusion with titanium
or chromium creates in corundum ?
0.20 grams. - ANS-A metric carat equals
0.5 mm - ANS-Usually, the diameter of the cultured pearls in a hank vary from each
other by no more than
100 - ANS-How many points are in a metric carat ?
15 to 30 million years ago. - ANS-Most opal formed
1830. - ANS-Alexandrite was discovered in
1881 to 1887. - ANS-Kashmir's most important sapphire production period was from
1908 - ANS-By what date had Kokichi Mikimoto begun cultering whole pearls ?
1930s. - ANS-Emeralds were discovered in Zambia in the
,1940s. - ANS-The first flame-fusion star rubies were produced in the
1950s. - ANS-The Sandawana emerald mine was discovered in the
1970s - ANS-When did Madagascar become a significant source of blue sapphire?
2 through 6 - ANS-In practice, what GIA Colored Stone Grading tone levels apply to
grading transparent colored stones ?
200 BC. - ANS-Written information on dyeing gems dates back about
3 to 10 percent water. - ANS-Most opal contains
3mm and below. - ANS-Sieves are most useful for sorting round gems with diameters
5. - ANS-When you first start to count a large pile a large pile of small gems, it's best
separate them into groups of
6. - ANS-The most common number of rays in a star corundum is
90 or more - ANS-What's the estimated percentage of fashioned emeralds that contain
filled fractures ?
A "foreign crystal" that formed in unrelated rock and was brought to the surface as a
passenger in magma. - ANS-Xenocryst
A bead used as the core of a cultured pearl, usually made from a freshwater mussel
shell. - ANS-Bead nucleus
A broad flash of color in labradorite feldspar that disappears when the gem is moved. -
ANS-Labradorescence
A broad gem category based on chemical composition and crystal structure. -
ANS-Gem species
A cabochon with a curved, undercut bottom, designed to lighten the tone of a gem
material. - ANS-Hollowback
A chemical that treaters mix with some resin to cause them to solidify. - ANS-Hardener
,A city, region, or country with a large number of gemstone manufacturers. - ANS-Cutting
center
A clear, viscous substance that's used to fill fractures in gemstones. - ANS-Resin
A color's strength or intensity. - ANS-Saturation
A company or individual that supplies gems to jewelry manufactures and retailers. -
ANS-Wholesaler
A company that prepares cultured pearls for the market. - ANS-Processor
A cryptocrystalline quartz aggregate. - ANS-Chalcedony
A crystal growth habit with a bumpy appearance similar to a bunch of grapes. -
ANS-Botryoidal
A crystalized form of calcium carbonate found in nacre. - ANS-Aragonite
A cultured pearl grown around a nucleus glued under the mantle tissue inside a
mollusk's shell. - ANS-Cultured blister pearl
A curved and ridged fracture in a gemstone, extending from the surface inward. -
ANS-Conchoidal fracture
A cutting style that combines brilliant-cut and step cut facets. - ANS-Mixed cut
A cutting style that contains brilliant-cut and step-cut facets. - ANS-Mixed cut
A cylindrical synthetic crystal produced by the flame-fusion process. - ANS-Boule
A damaged area on a gem, usually near the girdle. - ANS-Chip
A deposit where gems are eroded from the source rock but remain in place close to the
source. - ANS-Eluvial deposit
A deposit where gems are eroded from their source rock, then transported away from
their source and further concentrated. - ANS-Alluvial deposit
A design engraved into the surface of a gemstone. - ANS-Intaglio
, A discounted price for buying an entire parcel or a substantial part of it. - ANS-Lot price
A distinct change in gem color under different types of lighting. - ANS-Color Change
A document that indicates a stone's geographic origin, based on its inclusions and trace
element chemistry. - ANS-Certificate of origin
A family of gems from several closely related mineral species. - ANS-Group
A flat break in a gemstone caused by concentrated included minerals parallel to a
twinning plane. - ANS-Parting
A free-form cut that can feature alternating curved and flat surfaces. - ANS-Fantasy cut
A gem carving style in which the design often a women's profile, projects slightly from a
flat or curved surface. - ANS-Cameo
A gem colored by an element that is an essential part of its chemical composition. -
ANS-Idiochromatic
A gem colored by trace elements in its crystal structure. - ANS-Allochromatic
A gem dealer's term for a random sample from a parcel of gemstones, often used to
assess the parcel's overall quality. - ANS-Cut
A gem-producing area, or a particular mine in that area. - ANS-Source
A gemstone's ability to withstand wear, heat, and chemicals. - ANS-Durability
A gemstone's basic color, determined by its selective absorption of light. -
ANS-Bodycolor
A general term for a break in a stone. - ANS-Feather
A glittery effect caused by light reflecting from small, flat inclusions within a gemstone. -
ANS-Aventurescence
A grooved, neutrally colored, non-reflective tray, used to match sets of stones. -
ANS-Matching tray
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