A Guide to Natural Gemstones — Diamonds, Rubies, Emeralds & Sapphires

At Surya Jewellers, we have a firm principle: no synthetic stones. Every gemstone set into our 92.5 sterling silver is natural — formed over millennia in the geological crucible of the Earth. This matters, not merely as a point of pride, but because it determines a stone's character, its energy, and its lasting value.

Here is what you should know about the four precious stones we work with most.

Diamonds — The Standard of All Brilliance

The hardest natural substance on Earth (10 on the Mohs scale), a diamond is pure crystallised carbon formed under extreme pressure and heat, typically 100 miles below the Earth's surface. Its brilliance — the way it splits white light into a spectrum of colour — comes from its extraordinary refractive index.

The Four Cs

• ✦Cut — The most important factor for brilliance. A well-cut diamond will outshine a larger, poorly-cut one every time.
• ✦Colour — Graded D (colourless, rarest) through Z. Colourless stones allow the purest light transmission.
• ✦Clarity — Natural inclusions (internal characteristics) are the fingerprints of a natural diamond. Fewer inclusions mean higher clarity.
• ✦Carat — The weight of the stone. One carat equals 0.2 grams.

At Surya Jewellers, we select natural diamonds with attention to cut above all else — a beautifully cut smaller stone will always look more alive than a large dull one.

Rubies — Fire and Passion in Crystalline Form

A ruby is a red corundum (aluminium oxide), coloured by trace amounts of chromium. The finest rubies in the world come from Burma (Myanmar), and their coveted "pigeon blood" colour — a pure, vivid red with a hint of blue — commands prices that rival even diamonds.

Rubies score 9 on the Mohs hardness scale, making them excellent for everyday jewellery. Natural rubies almost always contain inclusions — a perfectly "clean" ruby at a very low price is a red flag for synthetics or glass-filled stones.

In Sanskrit, ruby is "ratnaraj" — the king of precious stones. In every culture, it has symbolised passion, protection, and nobility.

Emeralds — The Green of Living Things

Emeralds are a variety of beryl coloured by trace amounts of chromium and vanadium. Their characteristic lush green is unlike anything else in the natural world — it is the green of deep forest canopies and still mountain lakes.

Colombia produces the world's finest emeralds. Unlike diamonds, inclusions in emeralds (called "jardin" — the French word for garden) are accepted and even considered part of the stone's character. An emerald without any inclusions is so rare as to be suspicious.

Emeralds are softer than rubies and diamonds (7.5–8 on Mohs) and require more care. Avoid ultrasonic cleaners, sudden temperature changes, and hard blows.

Sapphires — The Calm Depth of the Sky

Sapphires are corundum — the same mineral family as rubies — coloured by iron and titanium. While we think of sapphires as blue, they come in every colour except red (which is, by definition, a ruby). The most prized are the "cornflower blue" sapphires of Kashmir and the "royal blue" of Sri Lanka.

At 9 on the Mohs scale, sapphires are the second hardest gemstone after diamonds, making them ideal for rings and bracelets that endure daily wear.

How to Tell Natural from Synthetic

• ✦Natural stones have inclusions. Perfection at a low price point is almost always synthetic.
• ✦Always ask for a gemstone certificate from a recognised lab (GIA, IGI, or equivalent).
• ✦Synthetic stones have a "too perfect" colour — uniformly vivid with no variation.
• ✦Buy from jewellers who are transparent about their sourcing. We are.

Every gemstone at Surya Jewellers is natural. It is not a marketing claim — it is the foundation of everything we make.