Gemstones as an investment — what to look out for

Gemstones fascinate not only as jewellery but have long been regarded as a store of value — compact, portable and independent of stock markets. Yet not every stone is equally suited to investment. Anyone considering gemstones should understand a few central factors.

1. Rarity beats fame

Diamonds are famous, but comparatively readily available. Considerably rarer stones such as tanzanite, grandidierite or untreated sapphires from particular localities often offer better potential for appreciation, precisely because supply is limited and will remain so.

2. Untreated rather than enhanced

Many gemstones on the market are heated, dyed or otherwise treated to improve colour and clarity. Untreated stones are rarer and hold their value considerably better, because treatment can be reproduced at any time — nature cannot.

3. Origin and certification

Geographical origin influences value substantially. A sapphire from a well-known, high-quality deposit often achieves markedly higher prices than a visually similar stone of unknown origin. An independent report creates transparency and confidence for a later resale.

4. Size is not everything

Contrary to common assumption, the price per carat often rises disproportionately with very large stones — while large, high-quality stones are also far harder to find. A good balance of size, clarity and colour is usually the sounder choice than carat weight alone.

5. Consider liquidity

A gemstone cannot be sold at the push of a button like a share. Anyone investing in gemstones should plan for a longer horizon and ideally know a trustworthy dealer or appraiser who can help with resale.

Conclusion

Gemstones can be a sensible addition to a portfolio — provided you pay attention to rarity, absence of treatment, verified origin and a realistic assessment of liquidity. If in doubt, rely on the advice of an experienced specialist.