Shopping for Jewellery Like a Pro: Spotting Fakes and Caring for the Real Thing

Most of us have been there: a beautiful piece catches your eye, the price feels almost too reasonable, and you walk away wondering whether what you bought is actually what you were told it was. Jewellery fraud and misrepresentation are far more common than the industry likes to admit. But the good news is that with a little knowledge, you can shop with the same confidence as a seasoned professional.

This guide covers the essentials — from spotting fake diamonds and identifying imitation gemstones, to understanding what questions to ask a jeweller and how to care for genuine pieces once you’ve invested in them.

Why Fakes Are So Convincing Today

The days of green skin from a copper ring are largely behind us. Modern technology has made imitations increasingly sophisticated. Lab-grown diamonds are chemically identical to mined ones. Synthetic sapphires look flawless to the naked eye. Glass filled with lead can mimic the lustre of a fine ruby. Even experienced buyers can be fooled without the right tools and knowledge.

This isn’t to say that all alternatives are bad — lab-grown stones are a legitimate and ethical choice when sold honestly — but misrepresentation is a real problem. A stone sold as natural that is actually synthetic, or a treated gem sold as untreated, is fraud. Understanding the landscape is your first line of defence.

Reading the Setting: What the Metal Tells You

Before you even look at the stone, the setting can tell you a great deal. Genuine fine jewellery is typically made in platinum, or 18-carat or 9-carat gold. Look for hallmarks stamped inside rings or on clasps — in Australia, common marks include 375 (9ct gold), 750 (18ct gold), and PT950 (platinum).

If there are no hallmarks, that’s not automatically a dealbreaker for antique or handmade pieces, but it warrants further investigation. Plated metals will often show wear at high-contact points — the inside of a ring band, the edges of a pendant — revealing a different coloured metal beneath. Fine jewellery doesn’t do this.

A quality setting is also a proxy for a quality stone. Reputable jewellers don’t put genuine, valuable gemstones into poorly constructed mounts. If the setting looks flimsy or roughly finished, be sceptical of what it holds.

Gemstones: Natural, Synthetic, Simulant — Know the Difference

These three categories are routinely confused, and the distinction matters enormously for value.

Natural gemstones are formed in the earth over millions of years. They may be untreated or treated — heat treatment, for example, is common in sapphires and rubies and, when disclosed, is generally accepted. Untreated natural stones of fine quality command the highest prices.

Synthetic (or lab-grown) stones share the same chemical composition as their natural counterparts but are created in a laboratory. A synthetic emerald is a real emerald in a chemical sense — it’s simply not a natural one. The price difference is significant, and disclosure is legally required.

Simulants are an entirely different material made to look like something else. Cubic zirconia simulates diamond. Red glass simulates ruby. These have no geological or chemical relationship to the stone they imitate and are worth very little. A cubic zirconia sold as a diamond is outright fraud.

Assessing Diamonds: Simple Checks Anyone Can Do

While no home test replaces a professional gemological assessment, a few basic checks can raise or lower your confidence quickly.

The fog test. Breathe on the stone as you would a mirror. A real diamond disperses heat so rapidly it clears almost instantly. A fake will fog up and stay foggy for a second or two.

Look for perfection with suspicion. Natural diamonds almost always have minor inclusions — tiny internal characteristics that formed during crystallisation. A stone that looks utterly flawless to the naked eye may well be synthetic or a simulant. This isn’t definitive, but it’s worth noting.

Check the refraction. Place the stone face-down on a piece of printed text. If you can read the letters through the stone, it’s almost certainly not a diamond — real diamonds refract light so strongly that text beneath them becomes illegible.

Weight. Cubic zirconia is noticeably heavier than diamond for the same size. If you’re familiar with what a diamond of a given carat weight should feel like, a simulant will feel surprisingly dense.

For any significant purchase, insist on independent certification from GIA, IGI, or another internationally recognised laboratory. No certificate, no sale.

Questions Worth Asking Every Jeweller

A confident, knowledgeable jeweller will welcome scrutiny. The following questions separate the professionals from the sellers hoping you won’t ask:

• Is this stone natural or lab-grown?
• Has it been treated in any way — heat, filling, coating, or diffusion?
• Does it come with a laboratory certificate?
• Can I have it independently appraised before finalising the purchase?
• What is your returns policy if the stone is not as represented?

If any of these questions are met with evasion, irritation, or vague assurances, trust your instincts and walk away.

Caring for the Real Thing

Once you’ve invested wisely, protecting that investment becomes the priority. Even genuine, high-quality jewellery needs proper care to retain its beauty and structural integrity.

Store pieces individually — gemstones can scratch each other, and even diamonds (the hardest natural substance) can chip if knocked against one another. Use soft pouches or a compartmentalised jewellery box.

Remove rings before washing hands, applying hand cream, or doing housework. Soap, chemicals, and abrasive surfaces cause build-up under stones and can damage softer gems like opals and emeralds.

Have your jewellery professionally cleaned and inspected once a year. A jeweller can spot loose claws, worn prongs, or early signs of metal fatigue before a stone is lost. What costs a few dollars in maintenance can prevent the loss of something irreplaceable.

For pieces you wear daily — an engagement ring, a favourite pendant — this is not optional. It’s simply the cost of ownership done right.

The Smartest Purchase Is an Informed One

Fine jewellery is one of the few luxury purchases that can hold genuine financial value over time — but only when bought correctly. Take your time, ask your questions, demand documentation, and choose jewellers who treat your scrutiny as a sign of good taste rather than an inconvenience. The real thing is always worth the extra care it takes to find it.