Does Cleaning Jewellery Increase its Value?

Cleaning antique jewellery can improve its appearance, but it does not automatically increase its value. In fact, with older pieces, the safest assumption is that less is more. Value depends on age, rarity, maker, materials, condition, provenance and desirability… cleaning can either reveal these qualities or accidentally cause harm. The key distinction is between removing harmful dirt and removing historic character.

^{A Victorian diamond and emerald insect brooch in the form of a fly}

^{Sold for £15,500}

There are clear advantages to careful cleaning. Surface grime from skin oils, cosmetics, perfume and dust can make a jewel look dull and may, over time, contribute to deterioration and corrosion. A gentle clean can show the true colour of stones, reveal hallmarks, make settings easier to inspect and help a seller present the piece attractively. If dirt is obscuring craftsmanship, sympathetic cleaning may make the jewellery more appealing to buyers and easier to appraise accurately. Routine care can also protect the structure of a wearable item, especially if it exposes loose stones, weakened claws or damaged clasps before they fail.

^{A Victorian Kashmir Sapphire and diamond cluster hinged bangle}

^{Sold for £70,000}

However, there are risks. Antique jewellery often combines delicate materials such as pearls, opals, turquoise, coral, foil-backed stones, enamel, early plastics, closed-back settings and old repairs, which may react badly to cleaning. Abrasive polishing can soften engraved detail, thin metal, disturb plating, loosen stones or remove evidence of hand-finishing. Once damage is done, it is usually irreversible. A ring made brilliantly shiny may look newer, but that is not always a plus in the pre-loved market because it may damage patina.

Patina is the surface change that develops through age and use, and includes the mellow glow of gold, darkening in the recesses of silver, softened edges, tiny scratches and the subtle indications of long ownership. To collectors, patina can signal authenticity and history. It can highlight design details and give an old piece the warmth that a modern reproduction lacks. Removing it may erase part of the object’s story and reduce its appeal, particularly for rare, high-quality or untouched pieces.

^{An important late Victorian diamond garland necklace}

^{Sold for £38,000}

That does not mean that all dirt should be treasured. Patina is not the same as sticky residue, green corrosion, trapped moisture or accumulated grime around settings. The difficulty is knowing which is which. A light wipe with a soft, dry cloth may be harmless for many pieces, but soaking, scrubbing, silver dips, toothpaste, baking soda, vinegar, bleach, ammonia, ultrasonic machines and steam cleaners can be dangerous for delicate antiques. Pearls and porous stones should never be soaked, while enamel and foiled stones require particular care.

Professional advice is the best option, as a reputable specialist in antique jewellery or gemmology can identify materials, assess condition and recommend minimal intervention. If you are thinking of selling your pre-loved jewellery, our qualified team of experts here at Dawsons have years of experience evaluating antique jewellery. We would be delighted to advise on the cleaning needs of your piece at one of their complimentary valuations. This specialist guidance can avert costly mistakes, supporting a more accurate valuation for sale.

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