A chain of air bubbles broke the surface of the water. A few seconds later, a young miner rose up through it and lifted a small tray of rough stones toward the buyer standing beside me.
I was at the edge of a flooded gem pit near Ratnapura, Sri Lanka — a town whose name means “city of gems.” To reach the gem-bearing gravel in the tunnels below, miners submerge themselves completely, diving through the water and breathing through narrow air tubes. Around the pit, families lived in temporary shelters, their whole livelihood staked on whatever the ground might yield. I stood there amazed. It is a moment I have never forgotten, because it taught me — long before any classroom did — that immense human labour, real risk and real courage lie behind every gem that finally catches the light in a showroom window.
These are the stones I have spent my working life with: emeralds, sapphires and rubies — the three the trade still calls “the big three,” the benchmark against which all other coloured gems are measured. I have examined, cut and certified them and I earned the Coloured Gem Professional Diploma from the prestigious Gübelin Academy in Switzerland. But my deepest understanding of these gems began exactly where that miner surfaced: at the source, where they emerge from the earth.
What the Mines Taught Me
Most jewelers meet a gemstone only after lapidaries have cut, polished and arranged it into neat commercial parcels. I met them much earlier — buried in raw earth, in places like that pit in Ratnapura.
Zambia taught me the other half of the lesson. While trading with small-scale miners near Ndola, in the Kafubu emerald region, I learned how to evaluate rough mineral crystals. Buying rough stones resembles a lottery: you bet on an unopened crystal and only field experience guides you toward the winning piece. Gem brokers taught me a rule that guides our practice today: exceptional stones remain extraordinarily scarce and recognizing true quality requires disciplined knowledge.
My travels were never only about the big three, either. It was in Mozambique and Brazil that I first fell for the vivid blue-greens of tourmaline and the cool, clear blue of aquamarine — stones that broadened my eye and my love of colour, well beyond the three most celebrated names.
Here is what I evaluate in each gem, and what you should look for when choosing your own.
Emerald: The Green That Stands Alone
No other gem matches the intensity of a fine emerald. Exceptional emeralds display a pure, slightly bluish-green hue with a soft, glowing inner depth. Even a modest emerald commands attention across a full room.
Emeralds rarely occur naturally without interior characteristics. When you look closely, you will see delicate mineral lines and veils. Gemologists call these internal structures the jardin — the French word for garden. While inclusions lower the value of most gems, they define an emerald’s unique character — its fingerprint and its proof of authenticity. A natural garden like this is extremely difficult to imitate, which is precisely why trade experts view a completely flawless emerald with suspicion: more often than not, it is synthetic. When I select an emerald, I evaluate its colour saturation first, ensuring the internal garden does not compromise the gem’s structural integrity or authenticity.
Colombia historically produces world-renowned emeralds, though Zambian mines — where I purchased rough directly from local miners — yield superb stones with deep, rich tones. I prioritize rich, vivid green saturation over sheer carat size every time.
Sapphire: Far More Than Royal Blue
When most people imagine a sapphire, they picture a deep royal blue. Ceylon (Sri Lanka) produces that famous velvety cornflower hue. However, sapphires actually occur in nearly every colour of the rainbow, including pink, yellow, green, violet and the rare salmon-pink padparadscha. Red corundum is the sole exception — we call that variety a ruby.
Sapphire ranks at 9 on the Mohs hardness scale, making it second only to diamond. This exceptional durability makes sapphire an outstanding choice for daily wear, particularly in engagement rings and family heirlooms. When selecting a sapphire, I look for an even, vibrant colour that remains bright under ordinary indoor lighting without turning dark or sleepy.
Ruby: The Rarest of the Three
Ruby and sapphire are close cousins — both belong to the mineral species corundum — yet they are not the same gem and it is a mistake to call a ruby merely a “red sapphire.” What sets them apart is chemistry: a ruby owes its red entirely to traces of the element chromium, a colouring agent quite different from those that give sapphires their many hues. That chromium does something remarkable — under ultraviolet light, a fine ruby glows red from within, a quiet clue to both its identity and its quality.
Fine natural rubies in larger sizes remain far rarer than comparable emeralds or sapphires, driving top-quality gems to record prices at global auctions. The trade considers “pigeon’s blood” — a vivid red with a subtle bluish undertone — the pinnacle of ruby colour. Origin matters, too: Myanmar (Burma) remains the historic benchmark and commands a premium, Mozambique now yields magnificent stones and Sri Lanka produces softer, slightly pinkish-red rubies. Thanks to corundum’s hardness, rubies provide excellent durability for everyday jewelry pieces.
Clarity on Treatments and Disclosure
Many coloured gemstones are enhanced to bring out their natural beauty, using methods the gem trade has accepted for generations — gentle heat for some rubies and sapphires, natural oils for some emeralds. There is nothing improper in this, provided one thing is always true: that you know exactly what you are buying.
That is why full disclosure is paramount to us and complete transparency forms the foundation of our business. Fine, untreated gemstones are significantly rarer and hold much higher market value than enhanced stones. We identify and document these exact characteristics daily in our Cyprus Gemological Laboratory. When you choose a stone with us, we explain its origin, natural state and any enhancement history.
Unheated, untreated gems require a higher investment. If an untreated gem exceeds your budget, we provide fine, ethically enhanced alternatives that deliver exceptional beauty at accessible price points. Clear guidance and absolute honesty have defined our family practice for nearly four decades.
Finding Your Gemstone
We maintain an extensive collection of loose precious coloured gemstones for you to examine in person, alongside finished designs in our Fine Gemstone Jewelry Collection. And while the big three hold pride of place, my own love of coloured stones runs wider still — you will also find tourmalines, aquamarines, tanzanites, spinels, chrysoberyls and more, each chosen with the same discerning eye.
Because we specialise in custom creations, our master lapidary can design and craft a bespoke piece around a gemstone you select. Cutting a rough crystal requires immense focus — a fraction of a millimetre can alter the gem’s fire and value. Transforming a dull rough stone into a radiant, faceted gem in our in-house lapidary remains the most rewarding part of our craft.
Every major gemstone leaves our showroom accompanied by an official certificate from the Cyprus Gemological Laboratory. Coloured gemstones truly reveal their magic in person — the way light shifts through the facets cannot be captured fully in a photograph. We invite you to visit our Nicosia showroom to view these exceptional gems in natural light.
| © 2026 Tsiropoulos Jewelry. All rights reserved
| 