Why Are Gold and Platinum Suitable for Making Jewellery?

Gold and platinum are suitable for making jewellery because they are lustrous, malleable, ductile and highly resistant to corrosion. They can be shaped into detailed ornaments without breaking and their low chemical reactivity helps them retain their shine. Gold can also be alloyed to improve its hardness, while platinum offers a naturally white appearance and substantial weight.

Their rarity and attractive natural colours also make them valuable. However, their usefulness does not depend on beauty alone. Their physical and chemical properties make them far more suitable for jewellery than reactive metals such as iron.

What Properties Make Gold and Platinum Suitable for Jewellery?

Gold and platinum offer four essential properties required in jewellery metals:

• Lustre: They have attractive surfaces that reflect light.
• Low reactivity: They do not react easily with air or moisture.
• Malleability: They can be hammered or pressed into different shapes.
• Ductility: They can be drawn into thin wires without breaking.

These properties allow jewellers to produce rings, chains, bracelets, earrings, pendants and detailed decorative patterns.

Gold and platinum also remain stable during normal daily use. They do not rust like iron or quickly develop a damaged surface when exposed to air.

Why Do Gold and Platinum Resist Corrosion?

Many metals react with oxygen, water or chemicals in their surroundings. Iron, for example, reacts with oxygen and moisture to form rust.

Gold and platinum behave differently because they are among the least chemically reactive metals. They do not readily lose electrons or combine with oxygen under ordinary conditions.

This low reactivity helps jewellery retain its metallic appearance. A gold or platinum ornament can remain recognisable for decades or even centuries when stored under suitable conditions.

Chemists often describe gold and platinum as noble metals because of their strong resistance to corrosion and oxidation.

Gold is especially unreactive. The Royal Society of Chemistry describes it as chemically unreactive and notes that it does not corrode easily. Platinum also resists oxidation and many common chemical substances.

Reactivity also determines whether one metal can displace another from a chemical compound. A related explanation is available in DesiVibe’s article on why a metal does not react with its own salt solution.

Gold and platinum can still react under extreme laboratory conditions. However, ordinary exposure to air and moisture does not damage them as easily as it damages more reactive metals.

Why Is Lustre Important in Jewellery?

Lustre describes the way a material reflects light from its surface.

Gold has a naturally warm yellow appearance, while platinum has a silvery-white colour. Both metals can develop a polished surface that reflects light and highlights the shape of an ornament.

This visual quality is important because jewellery is designed to be seen. A metal that quickly becomes dull, rusty or discoloured would require frequent treatment and would lose much of its decorative value.

Gold and platinum can maintain their appearance because their lustre works together with their low chemical reactivity. They are not only shiny when newly polished; they can also resist the chemical changes that cause many other metals to lose their shine.

How Do Malleability and Ductility Help Jewellers?

Jewellery often contains curved bands, thin chains, tiny links, narrow wires and detailed patterns. The metal must change shape without cracking.

Malleability is the ability of a metal to be hammered, pressed or rolled into thin sheets.

Ductility is the ability of a metal to be drawn into wires.

Gold is one of the most malleable and ductile metals. Jewellers can flatten, bend, stretch, engrave and shape it into intricate designs. Pure gold can even be beaten into extremely thin gold leaf.

Platinum is also malleable and ductile, although it requires specialised tools and higher working temperatures. Its melting point is much higher than gold’s, so working with platinum demands suitable equipment and experience.

These properties allow jewellers to shape both metals without causing them to break suddenly. They can also be joined, polished and finished into ornaments with smooth surfaces and precise details.

Why Is Pure Gold Not Used for Every Piece of Jewellery?

Pure gold is highly workable, but it is also very soft.

Twenty-four-carat gold represents nearly pure gold. It has a rich yellow colour and excellent corrosion resistance, but it can bend, scratch or lose its shape more easily than many gold alloys.

For this reason, jewellers often mix gold with other metals. A mixture of metals is called an alloy.

Common gold purities include:

• 24-carat gold: Nearly pure gold
• 22-carat gold: Approximately 91.7% gold
• 18-carat gold: 75% gold
• 14-carat gold: Approximately 58.3% gold

Copper, silver, palladium and other metals may be added to improve hardness, change colour or make the material more suitable for a particular design.

Copper can give gold a warmer or reddish appearance. Palladium and other white metals may be used in some white-gold alloys.

Adding another metal does not make gold chemically identical to pure gold. The alloying metals may react more easily with perspiration, sulphur-containing substances or chemicals in the environment. This is why some gold jewellery can develop slight discolouration even though pure gold itself is highly resistant to corrosion.

How Is Platinum Different From Gold?

Gold and platinum share several useful properties, but they are not identical.

Platinum is denser than gold. Two objects with the same volume would not weigh the same; the platinum object would be heavier.

This density gives platinum jewellery a noticeably substantial feel. However, density alone does not determine hardness or structural strength. Those properties depend on the alloy, manufacturing process, design and thickness of the jewellery.

Platinum jewellery is often produced with a high platinum content. A 950 platinum mark generally indicates that the alloy contains 95% platinum, although hallmarking rules and permitted descriptions vary between countries.

Why Is Platinum Used for Gemstone Settings?

Platinum is often used in engagement rings and gemstone settings because it is naturally white, corrosion-resistant and suitable for precise jewellery construction.

Its white colour does not create a yellow reflection around a colourless diamond. Correctly designed platinum prongs can also hold gemstones securely.

However, platinum alone does not guarantee that a stone will remain safe. The setting must have:

• The correct platinum alloy
• Sufficient prong thickness
• Proper contact with the gemstone
• Accurate angles
• Strong structural support
• Skilled workmanship

The Gemological Institute of America explains that platinum prongs must be properly proportioned and positioned. Thin, damaged or poorly constructed prongs can allow a stone to become loose regardless of the metal used.

Platinum is therefore suitable for gemstone settings when the jeweller combines the right material with correct design and workmanship.

What Does New Research Reveal About Gold’s Resistance to Oxygen?

A 2026 study published in Physical Review Letters provided a deeper explanation for gold’s resistance to oxidation.

Researchers examined how oxygen interacts with particular gold surfaces. They found that atoms on those surfaces can rearrange into structures that make it much more difficult for oxygen molecules to separate and react with the metal.

The research focused on specific gold surface structures, so it does not mean that every form of gold behaves identically. However, it helps explain at the atomic level why gold can resist oxygen so effectively.

The original study is available through the American Physical Society.