Key Words Flashcards
Alloy
A mixture of two or more metals made by melting them together.
Base Metal
Nonprecious metal such as copper, nickel or zinc
Pewter
A Tin Alloy
Atleast what percentage of pewter consists on tin?
90%
What are 5 metals that are used to alloy tin?
1) Antimony,
2) Copper,
3) Lead,
4) Bismuth and
5) Zinc.
Platinum Group Metals (PGM)
Platinum and five other metals that are chemically and physically similar and deposited with it.
What are the 5 PGMs that are often deposited with Palladium?
1) Palladium
2) Iridium
3) Osmium
4) Rhodium
5) Ruthenium
What are some metals used to make platinum alloys?
1) Ruthenium
2) Palladium
3) Cobalt
4) Iridium
5) Copper
Precious metals
Investment commodities with an inherent currency value as jewelry and industrial metals.
Whats are examples of precious metals?
Gold, Silver and PGMs
Tensile Strength
A metals ability to withstand the stress of stretching. This is required by the amount of force required break a specific unit area of a wire or material.
Hardness
A metals ability to withstand scratching.
Why are precious metals alloyed?
To make them harder and more resistant to wear.
What 2 are scales are most commonly used for metals?
Vickers and Brinell Hardness Scales
Fine Gold
Gold containing no other elements or metals.
What are 2 other names for Pure Gold?
Fine gold,
24K gold
What number represents the fineness of pure gold?
999
Fineness
The amount of gold and platinum in relation to 1000 parts.
Karat (Carat)
A measure of gold purity
How pure is 1k gold (in fraction)?
1/24th
Carat
The weight of gemstones.
What is the difference between Karat and Carat?
Karat is referring to the purity of gold while Carat is refered to the weight of gemstones.
True or False: Outside of the US “Karat” is often Spelled “Carat” particularly in countries that are member of the british commonwealth.
True
Karat Gold
A gold alloy which in the US must have a fineness of atleast 10k.
What 4 countries require gold alloys to be atleast 9k to be considered Gold.
1) UK
2) Spain
3) Japan
4) Canada
What 2 countries require gold alloys to be atleast 8k to be considered gold?
Mexico and Germany.
What 2 countries require gold alloys to be atleast 18k to be considered gold?
France and Italy
Plum Gold
Gold that has the same purity as the mark stamped on it. For example 14KP
What are the 2 other terms for Fine Gold?
Pure Gold and 24k gold
Solid Gold
Gold that is not hallow
Vermeil
Sterling silver covered with atleast 120/millionth of an inch of fine gold.
Whats are two techniques used to create vermeil jewelry?
Electroplating or Mechanical Bonding
Avoirdupois weight
The weight system used in the U.S. for food and people and almost everything except precious metals and gems.
What is 1avoirdupois in ounces?
15 ounces
Carat
A unit of weight for gems.
What i 1 carat in grams?
1/5 of a gram.
What is a grain in pennyweight?
A measurement of weight equaling 1/24 of a pennyweight.
Pennyweight
Unit of weight equaling 1/20 of a troy ounce.
Where is pennyweight mostly used for jewelry trade?
In the US
