Two stones, one name. The difference is everything or nothing, depending on what you value.
The question of natural versus synthetic ruby is one of the most commercially significant in the coloured gemstone market and one of the most frequently misunderstood. The two stones are chemically identical: a synthetic ruby is genuine corundum coloured by chromium, produced in a laboratory rather than in the earth. But chemistry is not the whole story, and for anyone considering a significant ruby purchase, understanding what separates natural ruby gemstones from laboratory-grown material is worth the time it takes to do properly.
This guide covers that distinction clearly: what each stone is, how they compare on colour, clarity, and long-term value, why natural ruby gemstones command their price, and what the treatment landscape looks like within the natural ruby market because not all natural rubies are equal either.
What Is a Natural Ruby Gemstone?
A natural ruby is a variety of corundum the mineral aluminium oxide coloured red by trace amounts of chromium. It forms in the earth under specific geological conditions: typically in marble or basalt host rock, where the right combination of elements and temperatures allows corundum crystals to develop over millions of years. The chromium content that produces the red colour also causes ruby to fluoresce under ultraviolet light and in strong natural daylight, giving fine specimens a quality of luminosity from within that synthetic material replicates imperfectly.
Natural ruby gemstones are among the rarest coloured gemstones produced by the earth. The geological conditions required for their formation are uncommon, and the fraction of rough that yields gem-quality faceted stones in meaningful sizes is small. Fine natural ruby above one carat vivid, eye-clean, and unheated is genuinely scarcer than comparable diamonds. This rarity is the fundamental basis of the natural ruby stone's significance in the market, and it underpins everything that follows in this comparison.
What Is a Synthetic Ruby?
A synthetic ruby also called a laboratory-grown or lab-created ruby is chemically, physically, and optically identical to a natural ruby. It is aluminium oxide coloured by chromium, with the same crystal structure, the same hardness of 9 on the Mohs scale, and the same refractive index. The only difference is how it formed: in a controlled laboratory environment rather than over millions of years in the earth.
Several production methods exist. The Verneuil flame fusion process, developed in 1902, was the first commercial method and remains in widespread use for lower-cost synthetic material. Flux growth and hydrothermal synthesis produce material with slightly different internal characteristics. Each method leaves identifiable traces under magnification which is how a gemmologist distinguishes synthetic from natural ruby even when the two are visually indistinguishable to the naked eye.
Synthetic ruby should not be confused with ruby simulants materials such as red glass, garnets, or spinels that resemble ruby in colour but are not corundum at all. Synthetic ruby is the correct mineral; simulants are not. The distinction matters because this guide is a comparison between two genuine rubies one formed in the earth, one produced in a controlled environment not between something real and something imitation.
Natural vs Lab-Created Rubies: How They Compare
Colour
Both natural and synthetic rubies can display vivid, saturated red. In practice, synthetic rubies produced by flame fusion often display an almost too-perfect red - uniformly saturated, without the subtle variations in tone and distribution that characterise natural material. Natural ruby gemstones show colour that reflects the specific conditions of their formation: slight variations in tone, the influence of iron on the secondary hue, the way the chromium fluorescence interacts with silk inclusions to create warmth. These variations are not flaws they are the signature of a stone formed by the earth rather than by a process optimised for consistency.
Fine natural rubies, particularly those from Burmese sources, display a quality of red that laboratory production has never fully replicated. The pigeon's blood colour vivid, pure red with a slight blue secondary and strong chromium fluorescence - depends on a precise combination of trace elements and growth conditions that the earth produces but that controlled synthesis has not consistently achieved. This is one of the genuine ruby stone advantages that natural material retains over its laboratory equivalent.
Ruby Clarity Comparison
Ruby clarity comparison between natural and synthetic material reveals one of the most practically useful distinguishing characteristics. All natural rubies contain inclusions - fine silk (rutile needles), crystal inclusions, fingerprint inclusions, and healed fractures are characteristic of the species. A natural ruby without inclusions is so rare as to be genuinely exceptional. These inclusions are not defects; in ruby, they are evidence of natural origin and are assessed rather than penalised.
Synthetic rubies, depending on the production method, may be nearly inclusion-free or may contain characteristic growth features curved striae in flame fusion material, flux inclusions in flux-grown ruby, gas bubbles in some hydrothermal specimens. A gemmologist can identify the production method from these features under magnification. The practical significance for a buyer is this: an eye-clean ruby with no visible inclusions at a surprisingly accessible price is almost certainly synthetic. Fine natural rubies of any meaningful size are included, and their price reflects the scarcity of eye-clean natural material.
Durability
On this factor, natural and synthetic rubies are genuinely equal. Both are corundum, both rate 9 on the Mohs scale, and both have no cleavage meaning they resist impact fracture well in addition to surface scratching. The durability of a ruby, whether natural or laboratory-grown, is one of the ruby gemstone benefits that applies to both equally. For jewellery intended for daily wear, including rings and bracelets, both natural and synthetic rubies are among the most practical coloured gemstone choices available.
Value and Resale
This is where the distinction between natural vs lab-created rubies becomes most commercially significant. Natural ruby gemstones have an established market, a collector base, and a resale infrastructure. Fine natural ruby particularly unheated material from Burmese or Mozambique sources with documented provenance and laboratory certification - has demonstrated consistent value appreciation over time. Exceptional natural rubies are among the gemstones that achieve the highest per-carat prices at major auction houses.
Synthetic rubies have no comparable resale market. A laboratory-grown ruby purchased for several hundred dollars is worth approximately the cost of production, which continues to decrease as production methods improve and scale. The value of a synthetic ruby does not appreciate - it depreciates in line with the declining cost of laboratory production. For buyers who view a ruby purchase as an investment or an acquisition intended to hold value, this distinction is fundamental.
Price
The price difference between natural and synthetic rubies of similar apparent quality is substantial and this is intentional from the market's perspective. A synthetic ruby that looks identical to a natural one in colour and apparent clarity can be purchased for a fraction of the price of the natural stone. This makes synthetic ruby genuinely accessible for buyers who want the colour and durability of ruby in jewellery without the investment in natural material.
Natural ruby gemstones are priced according to colour, clarity, carat weight, origin, and treatment status the same factors that determine value in all fine coloured gemstones. Unheated natural rubies command a significant premium over heat-treated material at equivalent apparent quality. The price of a fine natural ruby reflects genuine rarity; the price of a synthetic ruby reflects the cost of a controlled industrial process.
The Significance of Ruby Stone: What Natural Material Carries
The significance of ruby stone extends beyond its physical properties into the realm of what the stone actually is a natural object formed over millions of years, in conditions that will never repeat in exactly the same way, producing a colour that has been valued across human cultures for centuries.
Natural ruby has appeared in the finest jewellery in the world for centuries in Mughal regalia, in European royal collections, in the pieces that achieve the highest prices at Sotheby's and Christie's. This is not because ruby is conventionally beautiful, though it is. It is because fine natural ruby is genuinely rare, and rarity in a gemstone that also happens to be one of the hardest and most durable in existence is a combination that sustains demand across generations.
A synthetic ruby carries none of this weight, not because it is inferior as a material, but because its story begins in a laboratory and its supply is limited only by production capacity. The distinction between a natural ruby gemstone and a synthetic one is the difference between something the earth made once, in a specific place, under conditions that will not repeat and something that can be reproduced indefinitely. For collectors, for investors, and for those who find the provenance of a natural stone meaningful, this is not a subtle distinction.
Ruby Stone Advantages: Natural vs Synthetic by Use Case
For investment and long-term value
Natural ruby gemstones are the only appropriate choice. Fine natural ruby with documented provenance unheated, certified, from a recognised origin - has a track record of value retention and appreciation that synthetic ruby does not approach. If acquiring a ruby as a long-term investment or as part of a considered collection, the case for natural material is unambiguous.
Browse our Natural Ruby Stone Collection
For significant jewellery with personal meaning
Natural ruby again. A piece of jewellery set with a certified natural pigeon's blood ruby carries a significance in its rarity, its geological history, and its cultural associations - that a synthetic stone cannot replicate. The difference is not visible in the colour; it is in what you know about what you own.
View our 1.65ct Natural Unheated Pigeon Blood Ruby Stone
View our Certified Natural Pigeon Blood Ruby Stone
For buyers focused purely on colour at low cost
Synthetic ruby is available at a fraction of the cost of natural material. It is important to understand, however, that this price reflects the cost of an industrial process rather than the rarity of a natural stone and that cost continues to fall as production scales. A synthetic ruby is not an investment in rarity; it is a purchase of colour. For buyers who understand this distinction clearly and are not concerned with provenance, natural origin, or long-term value, synthetic ruby is available in the wider market. At Gemstone WA, we sell exclusively natural ruby gemstones the distinction matters to us and to the clients we work with.
For custom designs on a considered timeline
Natural ruby in the cushion and oval cuts most commonly found in fine specimens suits bespoke commissions particularly well the variety of size and character in natural material means a stone can be found whose specific proportions and colour suit a particular design intention.
Explore our Natural Cushion Cut Ruby Stone
How to Tell Natural and Synthetic Rubies Apart
Visual inspection alone is not sufficient to distinguish natural from synthetic ruby. Both are chemically identical, and fine synthetic material can display colour and apparent clarity that matches natural ruby in photographs and to the naked eye. The following are the reliable methods of distinction:
- Inclusions under magnification: natural rubies contain characteristic inclusions - silk, fingerprint inclusions, crystal inclusions that synthetic rubies do not. Flame fusion synthetic ruby shows curved growth striae; flux-grown ruby shows flux inclusions. A gemmologist with a loupe can identify these in minutes.
- Spectroscopic analysis: the absorption spectrum of natural ruby differs from synthetic material in subtle but detectable ways. Advanced spectroscopy can identify not only whether a ruby is natural but often its geographic origin.
- Ultraviolet fluorescence: natural rubies typically show strong red fluorescence under long-wave UV. Synthetic rubies, depending on their production method, may show different fluorescence characteristics.
- Laboratory certification: a report from GIA, Gübelin, or another recognised gemmological laboratory will confirm whether a ruby is natural or synthetic, its origin if natural, and its treatment status. For any significant ruby purchase, laboratory certification is the most reliable assurance available.
- Price: an exceptionally low price for a ruby of apparently fine colour and clarity is a strong practical signal. Natural ruby gemstones of genuine quality are not cheap. If a price seems inconsistent with what natural ruby commands in the market, it almost certainly indicates synthetic material or significant undisclosed treatment.
Treatment in Natural Ruby: A Related Distinction
Within the category of natural ruby gemstones, there is a further distinction that affects value significantly: treatment status. The vast majority of natural rubies on the market have been heat treated subjected to high temperatures to improve colour and reduce the visibility of inclusions. This is a permanent, accepted, and disclosed practice.
Unheated natural ruby where the colour and clarity are entirely as nature produced them is considerably rarer than heat-treated material and commands a premium that increases with quality. A fine unheated natural pigeon's blood ruby from Burma with GIA certification is among the most valuable coloured gemstones available per carat.
Beyond heat treatment, there are treatments that are not accepted in the fine gemstone trade and that represent a significant integrity problem in the ruby market. Glass filling the injection of lead glass into surface fractures to dramatically improve apparent clarity fundamentally alters the stone's composition, compromises its durability, and requires special care that a natural ruby does not. Glass-filled rubies cannot be cleaned ultrasonically, are damaged by acids found in everyday cleaning products, and have a value that reflects their altered state rather than the quality of the underlying natural material. They should not be compared to heat-treated natural rubies on any basis.
Beryllium diffusion and colour infusion treatments similarly introduce foreign elements into the stone to alter its colour in ways that are not natural to the material. These treatments are not disclosed consistently in the lower end of the market and are one of the primary reasons that independent laboratory certification matters when purchasing any ruby of significance.
At Gemstone WA, our position is unambiguous: we carry heat-treated natural rubies, where treatment is permanent, disclosed, and universally accepted, and a carefully selected range of unheated natural rubies for those who require it. We do not carry glass-filled, beryllium-diffused, or otherwise artificially enhanced material under any circumstances. These are not fine gemstones - they are compromised natural material sold at prices that do not reflect what they are.
Ruby Gemstone Benefits: What Both Stones Share
Regardless of origin, ruby natural or synthetic shares a set of properties that make it one of the most practical coloured gemstones for jewellery:
- Hardness: at 9 on the Mohs scale, ruby is second only to diamond and is genuinely resistant to surface scratching from everyday contact. It is one of the few coloured gemstones durable enough for a ring worn daily across decades.
- Toughness: ruby has no cleavage it does not split along internal planes under impact making it resistant to chipping in a way that some harder stones are not.
- Colour stability: ruby's colour does not fade with light exposure or change with temperature. A ruby purchased today will display the same colour in fifty years.
- Versatility in jewellery: ruby's red works with yellow gold, white gold, rose gold, and platinum, and suits every jewellery category from engagement rings through to pendants and earrings.
These ruby gemstone benefits apply equally to natural and synthetic material. The distinction between the two is not about wearability or visual appeal it is about origin, significance, and long-term value.
Our Natural Ruby Collection
At Gemstone WA, we carry natural rubies exclusively no synthetic or laboratory-created material. Every ruby in our collection is natural, with treatment status disclosed on every stone. Our collection includes heat-treated natural rubies across a range of qualities, and a carefully selected range of unheated specimens for collectors and buyers who require it.
Explore our full natural ruby collection at gemstoneswa.com.au