The Rising Allure of Rare Coloured Gemstones in 2025: Why Rubies & Sapphires Are Stealing the Spotlight

Ruby and Sapphire Gemstones

In the world of fine jewellery and investment gems, the trend is clear: rare coloured gemstones are becoming more than accessories, they’re tangible assets, artistic statements and symbols of timeless elegance. At SICO International Ltd (London), we’ve witnessed first hand how demand for exquisite rubies and sapphires is surging globally. This blog post will explore the forces shaping this trend, dive into what distinguishes top-quality coloured gemstones, and share why investing in the right piece now could be a wise decision.

Market Dynamics: Why the Upswing for Coloured Gemstones?

Scarcity Meets Demand

Highly collectible gemstones, especially natural rubies and sapphires—are mined in ever-smaller quantities. As our London-based company emphasises, “All of our stones are certificated using a range of world-renowned laboratories” (GRS, Gubelin, SSEF, etc.).

When supply is limited, value rises. Global market research cited by SICO indicates the coloured-gemstone sector is expected to more than double by 2035.

Changing Investor & Collector Behaviour

Collectors are increasingly looking beyond diamonds. The unique hues, provenance and story behind a ruby or sapphire can command premium attention. At SICO International, we focus on “sourcing and buying the finest and rarest coloured gemstones available in the world.”

For forward-looking clients, this means that an exceptional gemstone isn’t just jewellery—it’s a conversation piece and a portfolio asset.

Ethical and Traceable Sourcing

Today’s sophisticated buyer cares about provenance, lab-certification and ethical sourcing. At SICO we adhere to rigorous standards, something that resonates strongly in the luxury market and strengthens trust in coloured-gemstone acquisitions.

What Makes a Coloured Gemstone Truly Exceptional?

When evaluating rubies and sapphires (or other rare coloured stones), three key attributes stand out: colour, clarity/cut, and certification/provenance.

For rubies: a rich, vivid red (sometimes called “pigeon blood”) is highly prized. At SICO, our rubies “are mainly from Mozambique … up to 15 carat size”.

For sapphires: deep royal blue, or rarer hues like padparadscha (a pink-orange), command attention. Our sapphires come from Sri Lanka and Madagascar and range “from 0.30 up to 20 carats”.

Clarity & Cut – Bringing Out the Best

While diamonds often prize flaw-free clarity, coloured gemstones require a more nuanced approach. A slightly included ruby or sapphire can still be extraordinarily beautiful—sometimes inclusions reveal the stone’s natural origin. At SICO, the focus is on natural (not treated) gems, superb cut and transparency.

Certification from leading laboratories (GRS, Gubelin, SSEF) backs these claims.

Certification & Provenance – Building Confidence

A certificate from a respected gem laboratory provides buyer assurance. As noted on the SICO site:

“All of our stones are certificated using a range of world renowned laboratories …”

Knowing exactly where a gemstone came from, its treatment history, carat weight and cutting style is vital, especially if you view the gemstone as both asset and heirloom.

Why Rubies & Sapphires Are Headlining in 2025

Here’s why these two categories stand out:

• Rubies: Often called the “king of coloured gems”, their fiery red hues ignite strong emotional and visual impact. Their natural scarcity (especially in high-quality form) places them in a rare class.

• Sapphires: Beyond the classic blue, sapphires now appear in “fancy” colours (pink, yellow, purple) and large carat sizes (as our collection includes up to 20 cts) making them highly versatile.

• Investment Appeal: As fewer large, untreated stones are mined, the premium for rare rubies and sapphires grows. These stones are increasingly seen not just as jewellery but as long-term stores of value.

• Unique Storytelling: For high-net-worth buyers, each gemstone from SICO International carries provenance, with the boutique service of London’s Hatton Garden and decades of expertise by our director, Anthony Aziz.

How to Choose the Right Gemstone: A Buyer’s Checklist

When considering a purchase through SICO International or any trusted gemstone dealer, ask the following:

• Is the gemstone natural or treated? Natural, untreated rubies and sapphires command the highest value. If treatments exist, they should be clearly disclosed.

• What is the origin? Knowing the country and mine can influence both rarity and value (e.g., Mogok rubies, Kashmir sapphires).

• Is there a certificate from a credible lab? Look for certificates from GRS, Gubelin, SSEF, etc., verifying weight, cut, treatment, origin.

• At SICO International we state explicitly the labs we use.

• Check the colour, cut and presence of inclusions:

  • A well-cut stone maximises brilliance, regardless of size.

  • Some inclusions may prove natural origin but should be minimal and not affect the stone’s appearance excessively.

• Ask about return policy, after-sales care and insurance value.

  • Reputable dealers offer guidance on setting, maintenance and valuation.

Why Partner with SICO International Ltd

Located in the heart of London, SICO International is recognised as one of the largest loose gemstone dealers specialising in rare coloured stones.

Here’s what differentiates us:

• Decades of Expertise: Led by Anthony Aziz who brings over 40 years of experience in the coloured-stone market.

• Boutique, Personalised Service: We source and supply rare stones, tailored to collectors, jewellers and discerning clients.

• Global Reach, Within London: From our London base we work with major mines and gem-markets worldwide to access rare material.

• Transparent Certification & Provenance: Every gemstone is supported by credible documentation.

• Focus on Rubies & Sapphires: While diamonds are part of our offering, our core specialism is coloured gemstones, rubies and sapphires, making us stand out in a specialised niche.

Conclusion

The world of rare coloured gemstones is rich with opportunity. For those seeking both beauty and investment, natural rubies and sapphires from a trusted source like SICO International present compelling value. As supply of these exceptional stones continues to tighten, the significance of provenance, certification and expertise becomes ever more crucial.

If you’re ready to explore some of the world’s finest rubies and sapphires or need guidance on building a curated gemstone collection, our London boutique is ready to assist. Discover the difference that true expertise and rare gems can make.

Get in touch today to begin your journey into rare coloured gemstone ownership.