sartorius GC503 jewelry balances
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GC503 is discontinued and Replacement the GD503
Sartorius Gem Scales
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Sartorius GC-503 Carat Balance Sartorius GC503 gem balance
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Carat balance that's top quality for fast and accurate weighing of individual gemstones as well as larger lots; 0.001 ct resolution up to 505 ct.  Precision Weighing Balances is your source for high-performance Sartorius Weighing Technology at affordable prices.  The affordable GC-503 weighs in carats or to be chosen from 15 other international mass units include g, lb, oz, ozt, tlh, tls, tlt, Gn, dwt, mg, parts/lb, tlc, mom, K, tol, bat, and MS.  Additional application programs include parts counting, weighing in percent, weigh averaging, and net-total formulation/second tare memory.  The GC-503 in made in Germany and backed by a 2 year manufacturer warranty by Sartorius North America located in Edgewood, New York.
optional carrying caseSartorius is a German company and maker of some of the world's finest balances since 1871 when they introduced the world's first pharmaceutical balance.  Only Sartorius shatters the limits when "the Guinness Book of World Records" listed the Sartorius Model 4108 as the most accurate balance in the world.  Sartorius has been proving their trustworthiness thanks to their top-of-the-line technology that ensures maximum accuracy.  Sartorius products are manufactured with ISO9001 standards and have the CE mark.  Sartorius' excellent reputation and image in the technologically sophisticated field of weighing balances make them a global leader.  Sartorius' endeavors to expand its traditionally outstanding position on the market for laboratory weighing balances now targets the jewelry and geologist marketplace.

The GC-503 is the ultimate analytical balances for the lapidary marketplace.  The GC-503 has very similar features to the Sartorius BL60S and BL120S Analytical Balance, but sold for hundreds less.  Basically, the gem market place is extremely price sensitive market sector verses the laboratory marketplace so Sartorius developed the GC-503 with a special price to meet the pricing requirements for the jewelry marketplace.  Whether you're weighing diamonds or chemical compounds the GC-503 offers 101 gram weighing capacity and increments in 0.2mg intervals.

One feature that we really like is low profile design of the GC-503 resulting in less bench space compared to conventional analytical balances.  The height from pan to top of glass door is only 5.23 inch high with the GC-503 verses for example the Sartorius BL120S is 7.9 inch in height from the pan to top of glass.  We see a lot of images in trade magazines showing analytical balances with tall weigh chambers having a large glass flask or beaker, but these photos are not really practical since the weight of the beaker/flask would typically exceed the weighing capacity of the balance especially if the beaker/flask is even half way filled with liquid. 

At no time can the total mass on the platform exceed the weighing capacity of the balance, no matter what balance you purchase.  Therefore, if you had a glass beaker weighing 70 grams and you place it on the weighing pan, pressed the tare button, the GC-503 would then display 0.0000g.  You would now have 31 grams weighing capacity left (101 - 70 = 31g.)  The point we are trying to stress is having a tall draft shield "typically does not offer you any benefits".  In the real world most people are using polystyrene weigh boats and beakers that weigh much less than glass, thus allowing you to weigh your solutions and compounds which is really the objective of using the balance.

Sartorius Double Lever SystemThe GC-503 produces steady readings using the high stability mode and the unique Sartorius weighing system even if the environmental conditions are not ideal for precision weighing.  The Double Lever System, or DLS, for short based on its special force transmission design.  With this patented system, Sartorius sets the technological standards ­ for the new millennium.  Just like the proven monolithic systems in Sartorius' CP Series and Master proSeries balances, this new "small" system is cut from a single block of a special, highly rugged aluminum alloy using high-speed 21st century milling technology.  The double lever principle offers two decisive advantages: the design in the area of the pan linkage is highly resistant to mechanical stress and therefore has exceptionally high mechanical stability, and the system is about half the size of the monolithic block cell, allowing for a smaller footprint.  Like the monolithic weigh cell, it is cut from a single block of aluminum and no screw fasteners are needed between functional parts.  This keeps the system less sensitive to fluctuations in temperature, and with fewer parts there is less chance of failure.

The Monolithic DLS system offers unbeatable advantages for daily use like Incredibly fast response time and Unfailing reliability and near-zero susceptibility to interference.  The reasons for these considerable advantages are two fold: the number of individual parts has been reduced by more than 70% and the mechanical construction has been designed to last for years of trouble-free operations.
SARTORIUS GC503 ANALYTICAL BALANCE with 100 g external cal

$ 1420.00

GC503 is discontinued and Replacement the GD503
Capacity x Readability (carats)

505 x 0.001 ct

Capacity(g) x Readability (mg)

101 g x 0.2 mg

Reproducibility (std deviation)
carats (ct)
milligrams (mg)

± 0.001 ct
± 0.2 mg

carats (ct)
milligrams (mg)

± 0.002 ct
± 0.4 mg

Response Time (average)

3 seconds

Tare Range FULL to Capacity
Selectable Weight Units g, ct, lb, oz, ozt, tlh, tls, tlt, Gn, dwt, mg, parts/lb, tlc, mom, K, tol, bat, and MS
Selectable Application Programs Mass unit conversion by toggling, tare memory, net total, weighing in percent, counting, averaging
Display Update

0.1 - 0.4 seconds depended upon filter level selected



Allowable Ambient Operating Temperature 5 C to 40 C (41 F to 104 F)
85% RH or less
Sensitivity Drift
(10° - 30°C/50°F-86°F)

± 2 ppm / °C

External Calibration

100g Included

Pan Size

ø80 mm / 3.1 in
(standard round pan)

Draft Shield Chamber Height
(from pan to top of glass door)

133 mm / 5.23 in

Dimensions (entire balance)
W x D x H

189 x 251 x 233 mm
7.4 x 9.9 x 9.2 in

Built-in RS-232 Interface

NO- Optional

Weighing Below Not Available.  Common applications for weighing below the balance include density determination.
AC Power Source

AC Adapter 120 VAC

Power Consumption

Approx. 16VA (supplied by AC adapter)

Standard Equipment

120V AC Adapter, Dust Cover, Stainless steel weighing pan, GC503 comes with 100g external cal mass

Optional Accessories

Printer, RS-232 interface, Carrying case, Rechargeable external battery pack, SartoConnect data transfer software


3 years manufacturer's warranty

Net Weight, Approx. 2.8 kg / 6.2 lbs.
Click image to learn more about features

LCD Standard - Click for more info   External Calibration - Click for more info   RS232 Optional - Click for more info 

Download the Instruction Manual for the GC503 download manual.  The instruction manual contains detail information regarding calibration, additional features and keypad functions.
Sartorius High-resolution  balance
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High-resolution balances made affordable.  High stability with very fast response for operator comfort and efficiency.  Sartorius GC-503 comes standard with 120V AC Adapter, gem pan, 100g Class F1 external cal mass & dust cover
Sartorius analytical balance
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  Sartorius balance weighing chemicals
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Image taken from the rear of the GC-503.  Features include bubble indicator to help leveling the balance with the 2 front adjustable feet.  Lock-down bracket to secure your precious Sartorius balance.   GC-503 shown weighing chemicals with a 3 5/16 x 3 15/16 medium polystyrene weigh boat.  Polished stainless steel weighing pan, ring and floor makes cleaning simple.
sartorius glass weighing chamber
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  sartorius balance with calibration weight
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Innovative high-grade draft shield with low profile design resulting in less bench space compared to conventional analytical balances (height from pan to top of glass door is only 5.23 inch).  Draft shield offers 3 sliding doors that slide open quietly and effortlessly.   120V AC Adapter, gem pan, 100g Class F1 external cal mass & dust cover are all standard with the Sartorius GC-503
sartorius analytical weighing display
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  sartorius weighing balances
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Easy-to-clean display field that is highly resistant to chemicals.  High contrast LCD (height of digits: 13 mm / 0.5")   Keys with positive click action for reliable and confident activation of specific functions.  Keypad holds its shape even after repeated use.  Toggles between two selected weigh units at the touch of a key
sartorius quality balances
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  sartorius lab equipment
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Spectacular packing insures your analytical balance is delivered without damage.   Styrofoam packing surrounds your Sartorius Analytical Balance lessen the chances of any damage due to rough handling by the shipping carrier.  Like we always say - to the shipper like UPS, fragile means football and the Sartorius is designed to handle the delivery.
sartorius carrying case
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  sartorius lab equipment
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$345 optional soft cover carrying case features die cut foam that specifically for the Sartorius GC503 carat balance and has cut outs to securely hold the balance, AC Adapter and weighing platform.  Two locking latches with keys assures the safety of your High Precision Sartorius Balance.
sartorius weighing chamber
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Easy-access, all-glass weighing chamber and easy-to-remove and easy-to-clean high-grade stainless steel weighing pan.  Weighing chamber base plate is easy to clean because all parts can be simply removed

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