Most jewellery mistakes aren't obvious in the moment — they reveal themselves six months later when a ring turns your finger green, a "diamond" turns out to be cubic zirconia, or an expensive stone cracks because you wore it in the shower every day. These are the mistakes worth knowing about before they cost you.
Mistake 1: Buying Gold-Plated Jewellery and Expecting It to Last
Gold-plated jewellery is not gold jewellery. It's a base metal (usually brass, copper, or stainless steel) with a thin layer of gold electroplated onto the surface. That layer is typically 0.5 to 2.5 microns thick — roughly one-tenth the width of a human hair. It wears through. How quickly depends on how you wear the piece, but for anything worn daily (rings and bracelets especially), the plating is usually visibly worn within 3 to 12 months.
The moment the plating wears away, you're wearing the base metal against your skin. Copper and brass cause the characteristic green discolouration on skin. The jewellery also tarnishes, discolours, and cannot be replated easily without looking worse than before.
The fix: Solid gold only. A 9k solid gold ring from R14,995 will outlast 20 plated rings, look better indefinitely with basic care, and hold its value. The upfront cost difference is real — the lifetime cost difference is enormous.
Mistake 2: Choosing a Soft Stone for a Daily-Wear Ring
Gemstone hardness is measured on the Mohs scale (1–10). For a ring worn every single day, you need a stone rated 9.0 or higher. Here's why: a 7.0 Mohs stone will scratch against everyday dust and sand particles (which contain quartz, rated 7.0), meaning the surface dulls within months. Below 7.0, damage accumulates quickly.
Stones to avoid in daily-wear rings:
- Opal (5.5–6.5) — stunning, but chips, cracks, and dehydrates with daily wear
- Moonstone (6.0–6.5) — gorgeous but too fragile for anything other than occasional wear
- Turquoise (5.0–6.0) — porous and highly reactive to moisture, perfume, and sweat
- Pearl (2.5–4.5) — the softest option, should never be in a ring worn daily
- Emerald (7.5–8.0) — acceptable hardness but usually heavily included, making it brittle
Stones safe for daily ring wear: moissanite (9.25), lab diamond (10), sapphire (9.0), ruby (9.0). For an engagement ring specifically, the choice should be near the top of this list — it's worn every day, forever.
Mistake 3: Ignoring Stone Certification
A stone without a certificate is a stone you can't verify. Any reputable jeweller selling moissanite or lab diamonds provides a GRA certificate (or equivalent grading report) with every stone. This document certifies the stone's weight, colour, clarity, cut grade, and origin (lab-grown vs natural). Without it, you have only the seller's word for what you're buying.
This matters because:
- Uncertified "lab diamonds" are sometimes cubic zirconia — visually similar but dramatically different in durability (CZ is 8.5 Mohs and scratches within months of daily wear)
- Uncertified "moissanite" can vary wildly in quality — GRA certification guarantees the grading standard
- Resale value (if you ever need it) requires documentation
At Heritage & Co., every moissanite and lab diamond comes with a GRA certificate. Never buy a significant stone without one.
Mistake 4: Choosing Carat Weight Over Cut Quality
Carat measures weight, not size — and more importantly, not brilliance. A 2ct stone with a poor cut will appear dull and smaller than a 1.5ct stone with an excellent cut. Cut quality is what determines how light enters and exits the stone, which is what creates the sparkle you actually notice.
This is one of the most common ways buyers feel disappointed with a purchase: they prioritised the number (2ct sounds better than 1.5ct) and ended up with a less beautiful ring. When evaluating stones, always ask about cut grade before carat weight. Excellent or Ideal cut grades consistently outperform heavier stones with Good or Fair cuts.
Mistake 5: Sizing Without Measuring Properly
Ring sizing feels straightforward but has genuine complexity. Finger size changes with temperature (fingers expand in heat, contract in cold), time of day (fingers are larger in the evening), and life stage (pregnancy, weight fluctuation). Common mistakes:
- Measuring first thing in the morning (fingers are at their smallest — the ring will feel loose by afternoon)
- Measuring in cold conditions only
- Using a string or piece of paper at home (these stretch and give inaccurate readings)
- Buying a size larger "just in case" — a ring that's too large is more likely to slip off and get lost than one that's slightly snug
Best practice: measure at the end of the day, at room temperature, ideally with a professional ring sizer. If in doubt between two sizes for a ring with a wide band (anything over 5mm), go up half a size — wide bands feel tighter than narrow ones.
Mistake 6: Wearing Fine Jewellery in the Wrong Conditions
Even the best-quality jewellery can be damaged by the wrong environment. The most common culprits:
- Chlorine (pools and hot tubs): Chlorine reacts with gold alloys and weakens the metal's structure over time. Remove gold jewellery before swimming.
- Household cleaners and bleach: Bleach can permanently discolour gold and damage stone surfaces. Remove rings before cleaning.
- Ultrasonic cleaners: Effective for diamonds and moissanite but damaging for most other gemstones, especially inclusions-heavy stones and softer gems.
- Perfume and hairspray: Apply these before putting jewellery on — the chemicals degrade metal finishes and cloud stone surfaces over time.
- The gym: Weight training in a ring risks both damaging the ring and injuring your finger. Either leave it off or use a silicone ring placeholder during training.
Mistake 7: Not Asking About the Return Policy Before You Buy
Fine jewellery is a significant purchase, and return policies vary dramatically between sellers. Some allow returns and exchanges freely; others mark custom or personalised pieces as final sale. Knowing this before you buy is essential — especially for engagement rings, where the recipient may want a different style, size, or stone.
Questions to ask before any significant jewellery purchase:
- Can I return or exchange within [X] days if it doesn't fit or if she doesn't love it?
- What's the resize policy, and is it included?
- Are custom or engraved pieces final sale?
- What does the warranty cover, and for how long?
Heritage & Co. offers free resizing on all engagement rings and supports WhatsApp consultation before purchase. WhatsApp us before you order if you have any questions about sizing, design, or stone options.
The Pattern Behind the Mistakes
Most of the mistakes above come from the same root: buying on impulse without the information needed to make a considered decision. Fine jewellery rewards patience and research. A ring you buy knowing exactly what you're getting — the metal, the stone, the certification, the return policy — will always feel better than one that looked good in a photo but didn't hold up to scrutiny.