A Purity No Longer Made: Collecting Antique 15-Carat Gold Jewellery
In 1932, Britain abolished the 15-carat gold standard. No new pieces have been made since. Everything that exists is pre 1932 — and that's exactly what makes it so special.
The Gold Standard Time Forgot
15-carat gold is 62.5% pure gold. The standard was scrapped nearly a century ago and replaced by 14ct. What that means for collectors today is a finite supply of Victorian and Edwardian jewellery in a gold tone you simply can't buy new — warmer than 9ct, not as loud as 18ct, and genuinely beautiful against the skin.
Every piece is historical by definition. Supply only goes one way.
Stamps vs. Hallmarks — And Why It Matters
Not all 15ct pieces are marked the same way, and it's worth knowing the difference.
A full British hallmark includes the maker's mark, the assay office symbol, a purity mark ("15" and/or "625"), and a date letter that tells you the exact year it was made. A maker's stamp — "15ct" or "15k" stamped into the metal — is simply the jeweller's own claim of purity, without outside verification. This was common on smaller pieces and anything made for export. It doesn't mean the piece is less genuine. It just means it's worth having tested if you want to be sure.
The three pieces below are a good example of both
The Crescent Brooch — Stamped, Tested, Intact
The crescent moon was one of the most popular designs of the 1880s and 90s — celestial jewellery was everywhere, and Queen Victoria herself was a fan. This brooch is encraved "15 CT." rather than fully hallmarked, but has been tested and confirmed. What makes it stand out is how complete it is: the original safety chain is still there, all the seed pearls are present, and the gold has that warm, rich tone that 15ct is known for.
The Chester Mourning Brooch, 1900 — Fully Hallmarked
This is the most collectable of the three. It has a full Chester hallmark with date letter R, which puts it at exactly 1900. Set with a glowing cabochon with a soft pink glow that seems to move as the light changes. The gold around it is hand-chased with leaves, flowers and fine beaded borders, finished in a peach bloom a chemical process that produces a matt finish
It's also a mourning brooch. The back opens to reveal a small compartment for a lock of hair or a tiny portrait. The safety chain and latch are both original and working. A fully dated, fully intact piece with this level of craftsmanship doesn't come along all that often.
The Heart Mourning Pendant — Enamel, Crystal, Sentiment
This one started life as a brooch and has since been put on a 9ct gold chain — a simple change that makes it much easier to wear day to day, without touching the original piece. The heart is rock crystal, with cobalt blue enamel details and a seed pearl on each end. Like the moonstone brooch, the back opens for a keepsake.
The enamel is what really catches the eye. Rich, deep blue against warm 15ct gold, and still in perfect condition after more than 130 years. Good enamel this old is harder to find than most people realise.
Why Collectors Keep Coming Back to 15ct
A colour of gold you can't buy new, craftsmanship that's rarely seen today, and pieces that are antique by definition. 15-carat gold jewellery is still quietly undervalued compared to similar diamond-set pieces — which makes right now a good time to be paying attention to it.
Browse our current 15-carat gold inventory or get in touch to discuss what you're looking for.
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