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Weight conversion information chart.
These weight conversions are used often in the jewelry trade both for precious metals and gemstones. We list them here in answer to the many requests we have had for them.
Troy Weight
Used in weighing the precious metals.
24 grains = 1 pennyweight (dwt.)
20 dwt = 1 ounce Troy
12 ounces = 1 pound Troy
5760 grains = 1 pound Troy
480 grains = 1 Troy oz.

1 kilogram = 2.68 pounds
1 kilogram = 32.15 Troy oz.
1 kilogram = 2.2046 lbs. Avoir
1 kilogram = 35.2740 oz. Avoir
1 kilogram = 15,432 grains
Troy oz. – 1.0972 Avoir oz.

Carat Weight
Used in weighing precious and semi-precious stones. (Note: the term “Karat” refers to the quality of purity in gold.)
1 carat = 31/16 grains Troy
1 carat = .007 ounce Acoir
1 carat = 1/5 gram

The carat is further divided into points for simple measurement:
1 carat = 100 points
½ carat = 50 points
¼ carat = 25 points
1/8 carat = 12 ½ points


Avoirdupois Weight
Used in weighing base metals.
16 drams (or drachms) = 1 oz. Avoir
16 ounces = 1 pound Avoir
16 ounces = 7,000 grains
28 pounds = 1 quarter English
4 quarters = 1 hundredweight (cwt.)
20 hundredweight = 1 ton Avoir

1 pound Avoir = 14.5833 Troy oz.
1 ounce Avoir = 0.914 Troy oz.
1 pound Avoir = 7,000 grains
1 ounce Avoir = 437.5 grains
1 pound Avoir = .4359 kilo.

Gram Weight
1 gram = 15.43 grains Troy
1.555 grams = 1 pennyweight (dwt.)
31.104 grams = 1 ounce Troy
28.35 grams = 1 ounce Avoir

1 grain = 0.0648 grams
1 grain = 64.80 milligrams
1 milligram = .015432 grams
1 gram = .035274 Avoir oz.
1 gram = .032151 Troy oz.


Diamond information. Four C's diamond grading chart.
Find more gemstone information. Visit our Gemstone pages.

Find carat conversion charts:
Marquise cut gems, Octagon cut chart, Oval cut chart,
Pear shape gems, Pearls per inch chart, Round cut gems,

Round diamond carat conversion chart

 

 
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