Why Solid 18K Gold? The Case Against Gold-Plated Jewellery

Walk into any fast-fashion jewellery retailer and you'll find beautiful-looking rings and necklaces at surprisingly low prices. Many of them look, at first glance, like real gold jewellery. Most of them are gold-plated — and the difference matters enormously when you're buying something you intend to wear every day for decades.

What Is Gold-Plated Jewellery?

Gold-plated jewellery is made from a base metal (typically brass, copper, or silver) with a thin layer of gold electroplated onto the surface. The gold layer is typically 0.5–2.5 microns thick — a fraction of a human hair. It looks like gold, briefly. Then it wears off.

How quickly depends on the thickness of the plating, the acidity of your skin, how often you wear it, and exposure to water, chemicals, and sweat. For a ring worn daily — removed for hand washing, exposed to cleaning products, rubbed against surfaces constantly — gold plating can begin to wear noticeably within six to twelve months. Within two to three years, most gold-plated rings will show significant wear-through on the areas of highest friction.

What Is Solid 18K Gold?

Solid 18K gold contains 75% pure gold alloyed with other metals (typically silver, copper, and palladium in various combinations depending on the gold colour). The gold is consistent throughout the entire piece — there's no base metal beneath a thin coating. If you scratch a solid 18K gold ring, you find more 18K gold underneath.

18K is the standard for fine jewellery in Australia. It's high enough in gold content to be durable and retain a beautiful colour, while the alloy metals add the hardness and strength needed for everyday wear. 24K gold (99.9% pure) is too soft for jewellery worn under pressure; 9K gold (37.5% gold) is more affordable but shows visible colour differences and wears differently.

The Long-Term Mathematics

A gold-plated ring that costs $80 and needs replacing every two years costs $40 per year. A solid 18K gold ring that costs $2,000 and lasts a lifetime — properly maintained — costs less than $50 per year over 40 years. Quality jewellery is almost always the better long-term value, and for an engagement ring, there's no real argument for anything less.

What About Rhodium Plating on White Gold?

White gold is a slightly different case. Natural 18K white gold (gold alloyed with white metals) has a slightly warm or grey tone, so it's typically rhodium-plated to give it a bright, pure white finish. This plating does wear over time — typically every one to three years — but the piece underneath is still solid 18K white gold, not base metal. Replating is inexpensive and restores the ring to its original brightness.

Every Una Diamond ring is made in solid 18K gold or platinum — never gold-plated. Browse our engagement ring collection or get in touch with any questions about materials and construction.

18K Gold Rings at Una Diamond

Every Una Diamond ring is made in solid 18K gold — no plating, no compromise:

• 18K Yellow Gold rings
• 18K White Gold and Platinum rings
• The Georgina — oval-cut solitaire in solid 18K gold