Gold Plating for Jewelry, With Pictures From the Workshop

Three tanks for rinsing in the gold plating process

Rinsing Tanks for the Multi-step Process of Gold Plating Jewelry

I’ve been asked what kind of equipment is used in then professional gold plating of jewelry. Having gold plated jewelry for years for my clients, with a little help from my plater friends, I decided to go “back stage” and take you with me!

In this post I’ll give you a peek behind the scenes at the equipment that is used in gold electroplating.

In order to help you understand plating better, I’ll also, with the help of K.V., give you some technical info about it. Let’s take a walk inside the workshop together. See my earlier post on “Gold Plating Jewelry Explained – How Plating Renews Your Old Jewelry.”

The Basic Principles of Plating

Machine tracking temperature of gold plating tanks

This Machine is a Plating Rectifier. It Controls the Current, Which is Shown in Volts and Amps and Adjusts for Both

Plating describes surface-covering where a metal is deposited on a conductive surface, like gold over silver. Plating has been done for hundreds of years, but the years have improved the techniques, equipment and access to it.

Plating is used to decorate objects, for corrosion inhibition, to improve solderability, to harden, to improve wearability, to reduce friction, to improve paint adhesion, to alter conductivity, for radiation shielding, and for other purposes. Jewelry typically uses plating to give a silver or gold finish.

Doing it Right For Safety and Great Results

Poly pro balls in a gold plating tank

These Polypro Balls Keep the Heat in and Particles Out in a Gold Plating Tank

There are four basic best practices for the best plating results.

1) The first one is temperature control. Plating results are the best when the temperature is kept at a constant high temperature.

2) Another factor necessary to successful plating is voltage control. Plating needs to occur at a certain electrical level, and the voltage must be tightly controlled.

3) Cleanliness of the liquid is also a factor in the success of gold and other metal plating processes. Ideally, plating baths are constantly filtered to remove dirt and contaminants. This means that a plating bath can be used for years. Then the water can be allowed to partially evaporate and the remaining can be sent to a refinery to be filtered clean to keep it environmentally cool.

4) Great care is taken with excellent ventilation and different rooms for different plating processes. This is for the health of the plating professionals.

The Positives and Negatives of the Plating Process (It’s a Pun)

Cathode bar used in electroplating of jewelry


Cathode Bar. Items hanging from this Bar Get Negatively Charged Which Allows Plating Upon Immersion in  the Tank

The items to be plated are hung from a cathode bar. It is a pole with a negative electrical charge going through it. The pieces of jewelry connected to the cathode bar are also negatively charged.

When the jewelry items are submerged in the tank the electricity is turned on and the negatively charged jewelry attracts the positively charged ions present in the liquid.

The positively charged metal ions are submersed in the liquid bath. When the cathode bar is lowered into the bath the metal jewelry gets plated using this positive and negative science of attraction.

Different plating tanks are used to plate different karat amounts and different metal colors. The same tanks are used to plate the same metals over again. That’s why there are so many tanks.

First Step to Plating – Preparing the Surface to be Plated

polishing jewelry with a polishing wheel

Polishing Done by Hand

The metal to be plated must be very clean, with no oils or dirt.  This is necessary for two reasons:

A) dust and dirt interfere with the plated metals adhering to your piece, and

B) to keep the plating tanks free of contaminants.

Second Step to Plating – The Final Cleaning Step

Cleaning Jewelry with Steam

Steam Cleaning, an Important Step in Prepping Your Jewelry for Plating

We always want to be totally sure that your piece of jewelry has the best chance for an excellent plating result.

Steam cleaning blasts off any oils that managed to hang on during the polishing phase.

More intricate jewelry takes longer to prepare for successful plating, so expect to pay more if your jewelry has many nooks and crannies.

Third Step to Plating – Rinsing

Now that we’ve done all this cleaning, we need to make sure there is no cleaning chemicals left on your gold.

Fourth Step to Plating – Immersion in the Plating Tank

Gold Electroplating Tank for 24kt gold

This Tiny Tank is Only Used for 24kt Gold Plating

Controls for Temperature and Electrical Charge

Big Old Electrical Cords Snaking to Different Tanks with Voltage Controls

With the time, temperature and voltage carefully controlled your chain dives down into the liquid, and is deliciously covered in bright happy ions of gold.

When the timer dings, your piece is done, out it comes, brighter, gleamier and prettier. Otherwise, why do it?

Fifth Step to Plating –  Rinsing

Rose Gold Chains Hanging to Dry After Their Final Rinse

Rose Gold Chains Hanging to Dry After Their Final Rinse

Once rinsed they are dried and ready to go.

Additional Steps to Plating – Using Other Metals

Sometimes plating takes more than one plating immersion. Sometimes other metals are plated first to create a barrier between the original metal and the final metal to make a longer lasting bond.

Sometimes with costume jewelry the base metal would contaminate the tanks with the gold in them. So a different metal is plated prior to the gold plating.

There are little steps I’ve left out because it is repetitive and this is not an instructional how-to as much as a this is basically what is done.

End of Tour

I hope you enjoyed your armchair field trip to the gold plating palace!

My thanks to K. V. for answering my barrage of questions. “Do people really want to know this stuff?” he asked me. Let me know in your comments if indeed people want to know. I’ll tell him.

Gold Plating Jeweler,
Calla Gold

 

 

 

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About Calla Gold

Calla Gold is a Personal Jeweler and Author who takes pride in working with clients one-on-one to integrate their personal sense of style and taste into custom designed jewelry and repaired jewelry pieces.   Unlike typical Santa Barbara jewelry businesses, Calla Gold has no brick-and-mortar location. Calla Gold comes to you, bringing you the jewelry collection you want to see and collaborating with you to create unique custom jewelry. Calla also works with at-a-distance clients.

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emyloupark
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emyloupark

Calla, thank you so much for this tour! To answer K.V.’s question: “Yes, I do want to know.” This is all fascinating, and I had no idea plating involves electrical currents or that it is used for so many reasons (I just thought it was all decorative).

Amy Marie Orozco
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Yes, K.V. People are interested in this kind of information. I love going behind the scenes in different industries and walks of life. For me, the back story is usually the more interesting one.

Onwugbolu Frank
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Onwugbolu Frank

Calla Gold,
I actually read metal design in the university, and been wanting to start up a business in gold plating. Is there any way you can help.

Aditya agrawal
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Aditya agrawal

Hi
I want to do 24 kt gold plating on 18 kt gold jewellery can u help me ??

Paco
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Paco

Very good article. I’ve learned a great deal from reading this article. Thank you. Keep up the good work.

Lindi Bess
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Lindi Bess

I have a small heart keepsake, 1-1/2″-2″ that has my sisters ashes in it.it was gold plated but now it’s just old and worn.

Would gold plating work for this type of thing?

Andrews
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Andrews

I actually read metal design in the university, and been wanting to start up a business in gold plating. Is there any way you can help.

MUTHU
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MUTHU

Dear calla gold,
This article is very informative.Also pl explain me the describtion of liquid used for gold plating

Greg
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Greg

Is there another method of gold plating instead of dipping the item ? Like spraying or something ? In case you wanted to plate the outside and not the inside. I’m wondering how they do a gun ” pistol”.

Bruce Mansfield
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Bruce Mansfield

Do you do gold plating or just sell kits. If you do is there a minimum price.