Grain Ounce
gold..how many grains make a gram, and how many grams make an ounce?
Guide to Weights
Carat
The carat is used to measure the weight of diamonds and other gemstones.
Since 1st April 1914 a carat has been standardised as 1/5 of a gram. It is sometimes called a metric carat.
There are, or were, 4 grains per carat.
Because diamonds and other gemstones are expensive, it is necessary to use subdivisions of the carat. It is usually subdivided and recorded to 2 decimal places, a hundredth of a carat is known in rather unmathematical trade jargon as a "point". Half a carat is therefore written .50 carats or 0.50 carats, and would be referred to as 50 points.
In ancient times, there were various values for the carat, which ranged from 0.1885 to 0.2135 grams.
Gram
A gram or gramme is a standard metric unit of weight. There are obviously 1000 grams per kilogram.
In 1960, the ISO confirmed the IS unit system which was based upon the existing MKS (Metres, Kilograms, and Seconds) system.
The kilogram was defined as the weight of the International Prototype made of platinum and iridium which is held at the International Bureau of Weights and Measures in Sèvres in France.
Grain
An ancient unit which was originally based on the weight of a grain of wheat. The grain is the smallest unit of weight in the avoirdupois, troy, and apothecaries systems. Surprisingly it is identical in all three systems.
4 grains = 1 carat
24 grains =1 pennyweight
480 grains = 1 troy ounce
5760 grains = 1 troy pound
437.5 grains = 1 ounce avoirdupois
7000 grains = 1 pound avoirdupois
1 grain = 0.0648 grams (0.06479891)
15.432 grains = 1 gram
Troy
A system historically used for measuring the weight of drugs, precious metals and gemstones. The name comes from the French city of Troyes.
480 grains = 1 ounce troy
31.1035 grams = 1 ounce troy
12 troy ounces = 1 troy pound
20 pennyweights (dwt) = 1 ounce troy
1 pound = 373.242 grams
1 pound = 5760 grains
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