How to tell if gold is 9ct or 18ct?

How to identify 18 karat gold at home?

To determine if your 18- karat gold is real, simply place your gold piece of jewelry in nitric acid and observe its reaction. If a green reaction occurs, it is a metal of a lower karat content.

What are the German gold hallmarks?

GERMAN HALLMARKS

Since 1888 Germany uses uniform marks for silver and gold. These marks are the "Crescent and crown" (Halbmond und Reichskrone) for silver and the "Sun and Crown" (Sonne und Reichskrone) for gold.

What is the fastest way to test gold?

Magnet. This is a fast, non-desctructive test that works surprisingly well. Gold isn't magnetic, so if your piece is attracted by the magnet, you know it's fake. Like all tests, it won't catch every fake, but it's a really fast and effective test you can do at home.

Does vinegar really test for gold?

To perform the test, place your gold item into a small bowl and add a few drops of white vinegar. Pure gold will not react or change color because it's non-reactive.

How to tell if 9 carat gold is real?

How to Check If 9ct Gold is Real

1. Hallmark Verification. Look for the 375 stamp inside the jewellery. ...
2. The Float Test. Real gold is dense and sinks in water, while fake items may float or hover. ...
3. The Magnet Test. ...
4. The Acid Test. ...
5. Electronic & XRF Spectrometry Testing. ...
6. Weight & Scratch Test.

What are signs of fake gold?

How to Test: Hold a strong magnet near the gold piece. If it sticks, the item likely contains other magnetic metals like iron or nickel, indicating it's not pure gold. Caution: Some non-magnetic metals, like brass or copper, are also used in fake gold.

What mark is 9ct gold?

If a gold product bears the hallmark '375', then your gold has been tested and classed as 9 carat or 37.5 per cent pure. The remaining 62.5 per cent of the item is composed of different metals such as nickel, copper, or in some cases silver.

Do 9K and 18k gold look similar?

However, if you're looking for a gold item for long-term wear, like an engagement ring, then you might want to invest in 18K gold which is better quality and has a higher value. Ultimately, both 9K gold and 18K gold look the same, and both are beautiful options. So you cannot go far wrong if you choose either one.

What if my gold is not stamped?

A missing hallmark doesn't automatically mean it's fake. Some older or custom-made jewelry may not have a visible stamp. If your necklace passes other tests, it could still be real gold. A jeweler can confirm its authenticity.

Does 18ct gold turn green?

This reaction is more common in warm weather when sweat can amplify the process. Environmental Factors: High humidity, chlorine in swimming pools, or exposure to harsh chemicals can speed up the oxidation process, causing the metals in your 18k gold jewelry to react and leave a green residue.

What should you not clean gold with?

Scrubbing With Toothpaste

Cleaning your jewelry with toothpaste can do more harm than good. Toothpaste is abrasive, meaning it can scratch the gold and loosen the stones. And don't forget, toothpaste is corrosive to metal. Specifically, keep toothpaste away from your pearls and opals.

How accurate is the toothpaste gold test?

Hold your jewelry item under running water and rinse off the toothpaste. If your gold piece is real, the black spot will disappear making it look clean and shiny. If you can still see the black spot, this means the item is fake. Do note that this test is not 100% accurate.

Which is better, 99.9 or 916 gold?

Gold is highly malleable in its purest form, which is why it is mixed with other metals like zinc, nickel and other alloys to increase its durability and strength. 999 is the purest form of gold, meaning it has 99.9% gold whereas 916 has 91.6% gold.

How much is 1 gram of gold in Germany?

As of late December 2025, the price for 1 gram of pure gold (999.9 fineness) in Germany fluctuates around €120-€121, depending on the dealer and market, with physical 1g bars starting from roughly €158 (including premium/markup). Spot prices are generally lower (around €120), while buying physical bars adds a premium for manufacturing and dealer costs. 

What is the best brand in Germany?

Top German brands consistently include automotive giants like Mercedes-Benz, BMW, and Volkswagen, tech/software leaders like SAP and Siemens, and telecommunications leader Deutsche Telekom, alongside major players in consumer goods, retail (Aldi, Lidl), and industry like Bosch, Adidas, and Allianz, known globally for quality, engineering, and innovation.
 

What does the H stamp on gold mean?

An "H" stamp on a gold chain indicates the item is gold-plated rather than solid gold, with "HGE" meaning "heavy gold electroplate" or "hydrostatic gold electroplating" and "GE" meaning "gold electroplated". These markings show that a layer of gold has been deposited onto a base metal.