Specifics

NAME:
Names given to specific bullion. Usually relative to the design and/or symbol that commemorate the country it was minted from.
SHAPE:
Bullions are cast into different shapes to accommodate every investor needs.
Bullion coins

Bullion coins; are round in shape, highly refined precious metal products that are stamped and are produced to the exact specifications by numerous MINTS, back by their governments.

Bars; There are basically two types of gold bars. Cast and minted. There are many names for calling up bars, but they are all basically called gold or silver bars.
Ingot, Wafer & Biscuits
Cast bars are produced by pouring molten metal into moulds. These are usually called ingots. They are rough and the markings, such as the foundry or manufacturing mark, gold purity and registration number are pressed into the gold.
Gold bars which are stamped rather than cast, and therefore often thinner and flatter than cast bars are often called wafers or biscuits.

WEIGHT:
Most bullion coins come in a standard 1-oz. size. This weight is used worldwide, even in countries using the metric system. This is a result of the tradition of using 1-oz. trade dollars for worldwide commerce.

Here is a list of weight most commonly used:
5 Oz               1 Troy Oz                1 gram Bar
10 Oz             ½ Troy Oz               2.5 gram Bar
50 Oz             ¼ Troy Oz                5 gram Bar
100 Oz          1/10 Troy Oz           10 gram Bar
1000 Oz        1/20 Troy Oz           100 gram Bar

Different weight & sizes of a Gold Bullion

SIZES:
The standard size of a 1-oz. bullion coin starts from 30.0 mm in diameter and 2.00 mm thick and the shape is round. These dimensions all differ from all other bullion coin around the world. The weight of the coin also changes the size of each individual coin.

DESIGN:
Bullion coins are stamped with attractive designs to increase their appeal and value. The designs are typically symbolic of the country that produced them. The country of origin, purity and year minted are also included with the design. Many also contain mint marks, mottoes and a face value.

FACE VALUE: While the face value usually refers to the true value of the coin, it is largely symbolic.

CANADIAN GOLD MAPLE LEAF;                        
1 Oz - 50 CAD FACE VALUE                           
AMERICAN GOLD EAGLE;
1 Oz – 50 USD FACE VALUE
CANADIAN SILVER MAPLE LEAF;                   
1 Oz – 5 CAD FACE VALUE    
AMERICAN SILVER EAGLE; 
1 Oz – 1 USD FACE VALUE                

FINENESS:
Fineness is the actual gold content in a coin or bar and expressed as a "per mil," or thousandths. So .999 is 999 thousandths of the weight that are pure gold, the other 1/1000th is an alloy. Thus the higher the fineness of the metal very little impurities like silver, iron and copper are in the total mix. 

Correlation between karats and fineness:
• 24 karats = 999.9 fine
• 23 karats = 958.3 fine
• 22 karats = 916.6 fine
• 21 karats = 875.0 fine
• 20 karats = 833.3 fine
• 18 karats = 750.0 fine
• 16 karats = 666.7 fine
• 14 karats = 583.3 fine
• 10 karats = 416.6 fine

.999 vs .9999:
There is actually NO real Pure Gold, only a grade of refining the precious metal to near pure form. In simple terms .999 is very refined and .9999 is a HIGHLY refined Gold or Silver. The difference is almost unmeasurable in terms of real value. Minting companies have used the extra 9 as a means to increase perceived value and show refining technology.