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| Most colored stones are sold |
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Term
| What category of colored stone is often sold per peice? |
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| What category of colored stone is often sold per peice? |
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Term
| Sieves are most useful for sorting round gems with diameters |
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Term
| When you first start to count a large pile of small gems, it's best to separate them into groups of |
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Definition
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Term
| The color of a sorting pad should be |
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Definition
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Term
| Colored stones with higher values usually have |
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Definition
| medium to medium-dark tone and vivid saturation |
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Term
If an emerald weighs 3.50 carats and the stone's cost is $10,500.00, what is it's per-carat price?
(Divide $10,500 by 3.50 cts.) |
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If a parcel of carats weighs 382.00 cts. and the per-carat price is $80.00, what is the total cost of the parcel?
(Multiply the parcel's carat weight by the price per carat.) |
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If a parcel of amethysts contains 1,000 stones and weighs a total of 1,542.00 with a cost $0.75 per carat,what is the unit price?
(Multiply 1,542.00 cts (parcel total weight) by $0.75 (price per carat) for the parcel price of $1,156.00. Divide $1,156.00 by 1,000 (total # of stones in the parcel) for the unit price of $1.1565 rounded to $1.16. |
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What is the cost of a ruby that weighs 5.76 cts.and has a per-carat price of $5,500.00?
(Multiply 5.76 cts. by $5,500.00) |
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Term
| Which type of rough is usually faceted? |
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Definition
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Term
| To retain as much weight as possible from rare, high-quality rough, cutters would most likely vary |
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Definition
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Term
| Removing heavly included sections from gemstone rough by carefully tapping it with a small hammer is known as |
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Definition
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Term
| Rough that's ground to the approximateshape of the finished stone is called |
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Definition
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Term
| Which is most likely to undergo cobbing? |
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Definition
| Commericial-quality amethyst rough |
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Term
| Which cutting stage has the greatest impact on the value of the finished gem? |
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Definition
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Term
| Which colored stone variety has cutting challenges due to the vunerable cleavage planes? |
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Definition
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Term
| Translucent to opaque rough is often cut into a |
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Definition
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Term
| Which is a carved design that projects slightly from a flat or curved serface? |
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Definition
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Term
| Colored stones cut flat with shallow pavillions usually have areas of lower color intensity called |
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Definition
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Term
| A cutter can darken the color of a pale stone by cutting a |
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Term
| to judge brilliance, view the stone |
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Definition
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Term
| The purpose of most variations in a colored stone's face up outline is to |
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Definition
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Term
| Excessive bulge on a step cut |
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Definition
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Term
| Colored stones that rate "fair" for brilliance have |
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Definition
| between 25 and 40 percent brilliance |
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Term
| What is Myammar's most important gem export? |
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Definition
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Term
| Which location produces the majority of rubies that end up in mass-produced jewerly? |
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Definition
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Term
| Which trade term describes a mixture of gem qualites that represents unsorted production from a particular mine? |
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Definition
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Term
| Which term describes a specific rough gemstone quality range, usually determined by color, size, clarity and price? |
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Definition
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Term
| Where is rough from Mong Hsu brought into Thailand? |
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Definition
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Term
| In mining terms,the theft of a mine's productiom by it;s workers is known as |
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Definition
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Term
| Which of the following is a quantity of stones, sometimes of similar size and quality, from a single mine or from many different sources? |
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Definition
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Term
| Which of these is a cutting center for colored stones in Thailand? |
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Definition
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Term
| Materials cut free size are normally |
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Definition
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Term
| Gemstones cut to fit standard mountings are known as |
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Definition
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Term
| The market sector where better-quality gemstones are used in well-finished, moderately priced jewerly is known as |
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Definition
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Term
| Which term describes a random sample from a parcel of gemstones, often used to asses the parcel's overall quality? |
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Definition
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Term
| Which of the following is a price for buying an entire parcel of gems, or a substantial part of it? |
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Definition
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Term
| Which of the following is a premium price for selecting stones from a parcel? |
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Definition
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Term
| Which gemstone occurs in almost every color? |
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Definition
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Term
| The first impression of an object's basic color is it's |
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Definition
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Term
| Generally, cool-colred hues with low saturation look |
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Definition
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Term
| Use trade terms that imply geographic orgin only if the |
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Definition
| gem's actual source is known. |
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Term
| Which trade term describes certain tourmalines? |
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Definition
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Term
| Which abbreviation does the GIA Colored Stone Grading System use for a slightly purplish red hue? |
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Definition
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Term
| In practice, what GIA Colored Stone Grading tone levels apply to grading transparent colored stones? |
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Definition
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Term
| A see-through area in a transparent gemstone's bodycolor that usually results from the way the gem was cut is called |
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Definition
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Term
| A window usually differs from the rest of the stone in |
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Definition
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Term
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Definition
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Term
| The color of the background for grading a colored stone should be |
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Definition
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Term
| What type of lighting is best for grading color in a colored stone? |
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Definition
| Daylight-equivalent flurescent |
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Term
| Higher levels of saturation are usually found in stones with |
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Definition
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Term
| What two coloring agents are usually responsible for color change in gemstones? |
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Definition
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Term
| Emission of visable light by a material when exposed to invisible ultraviolet radiation is |
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Definition
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Term
| A characteristic or irregularity confined to the surface of a polished gemstone is a |
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Definition
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Term
| An angular, hollow space that resembles a mineral inclusion is called a |
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Definition
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Term
| A general term for a break in a stone is |
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Definition
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Term
| An inclusion with the most negative effect on a colored stone's clarity would be located |
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Definition
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Term
| In which colored stone clarity type are the gems usually eye-clean? |
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Definition
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Term
| The highest clarity grade for a colored stone is |
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Definition
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Term
| The term "silk" describes |
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Definition
| a group of fine, needle-like inclusions |
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Term
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Definition
| Partially healed fracture planes |
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Term
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Definition
| Partially healed fracture planes |
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Term
| Which of these gems are classified as a Type III? |
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Definition
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Term
| In which of the following colored stone clarity grades do the definitions vary for each clarity type? |
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Definition
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Term
| Which of these clarity characteristics would usually have the greatest impact on a gem's marketabiltiy? |
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Definition
| A large, unhealed feather |
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Term
| Gems that are usually eye-clean include: |
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Definition
| spodumene, yellow beryl and aquamarine |
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Term
| Inclusions are important to gemologists because they |
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Definition
| Can help separate natural from synthetic gems |
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Term
| Growth zoning in a colored stone is evidence of |
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Definition
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Term
| Two factors that determine an inclusion's impact on a gem's value are |
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Definition
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