Weighing fractions of Carats

How does one accurately weigh fractions of carats? We have a digital
scale that weighs ounces, troy ounces and grams. We can compute to
half-carat, but are unable to get any finer than that.

Any assistance will be appreciated.


You need a carat scale to weigh fractions of carats accurately.

Steven Brixner - Jewelry Designer - San Diego CA USA

How does one accurately weigh fractions  We can compute to
half-carat, but are unable to get any finer than that.

G’day; 1 carat is equal to 0.2 grams. (200 milligrams)

John Burgess; @John_Burgess2 of Mapua Nelson NZ

You need to get yourself a gem scale for weighing stones. Dendritics
makes the best and most reasonably priced scale around. Their scales
are available through all the major tool suppliers.

Daniel R. Spirer, GG
Spirer Somes Jewelers
1794 Massachusetts Ave.
Cambridge, MA 02140

Hi Cheryl,

The easiest way is to buy a carat scale. The electronic ones will
usually convert between grams & carats at the push of a button.

One other way is to use a gram scale capable of measuring milligrams.
A carat equals 1/5 of a gram. If a gram scale is used to measure
carats, it should be capable of measuring to 1/100 (1 point) of a
carat. 1 point is 1/500 of a gram. Some gemstones get very expensive &
being off, weight wise, can cost you a lot of money when buy or
selling a stone.


I have Digital Scales that measure in grams, grains, carats and troy
ounces. The brand is Tanita and will measure as low as 0.02ct. Could
offer you a New Zealand supplier if you can’t find them on the net.

Regards Johnny the Jeweller.