Questions about gemstones in general
What are gemstones?
The Essence of Beauty, Geology, and Time
Gemstones are natural minerals or crystals that have been valued for millennia due to their rarity, color, brilliance, hardness, and uniqueness. They are formed deep within the Earth – through pressure, heat, and geological processes that take millions of years.
A gemstone is more than a beautiful piece of nature. It is time shaped over millennia, condensed energy – a distinctive unique piece that touches with its individuality.
How do experts define a gemstone?
A stone is considered a gemstone if it meets three main criteria:
1. Rarity
The rarer a natural mineral is, the more precious it becomes.
Examples: Spinel, Sapphire, Ruby, Tsavorite, Sphene.
2. Beauty
This includes:
- Color
- Brilliance
- Pattern
- Light effect
- Transparency
3. Durability
Gemstones must be hard and durable enough to last for generations.
Why have gemstones fascinated people for millennia?
Because they unite nature, art, and time within themselves. Because they are wearable beauty. Because they touch us – through color, form, light, and their distinctive character.
A gemstone is more than an object.
It is an expression of identity.
How old are gemstones?
Gemstones are millions to billions of years old – older than any human civilization, older than plants, animals, or even many continents. Most colored gemstones formed deep within the Earth during immense geological processes.
Typical age ranges:
- Zircon: up to 4.4 billion years – among the oldest materials on Earth
- Ruby & Sapphire (Corundum): 150 million to over 1 billion years
- Spinel: 100–500 million years
- Emerald & Beryl: 20–300 million years
- Garnet: 50–600 million years
- Tanzanite: approx. 585 million years
- Tourmaline: 70–500 million years
Gemstones are thus time capsules – geological memories of eras when the world looked completely different. Their beauty is not only aesthetic – it is a piece of Earth's history that you hold in your hand. Especially in sapphires, inclusions sometimes reveal primeval forests in micro-size – it is simply fascinating!
How do gemstones get their color?
The color is created by trace elements in the crystal:
- Chromium gives red and green tones.
- Iron provides blue or yellow nuances.
- Vanadium creates violet nuances.
- Copper provides a luminous, almost neon-like turquoise (Paraíba).
Light strikes the crystal, is refracted, absorbed or reflected – precisely this interaction creates the spectacular colors we see. Each stone thus acquires its very own, geologically unique coloration.
What are the value factors for gemstones (4Cs Rule)?
Color • Clarity • Cut • Carat – the 4 Key Characteristics of a Gemstone
Gemstones are internationally evaluated based on four central criteria. These "4 Cs" (Color, Clarity, Cut, Carat) originated in the diamond industry and also apply to colored gemstones.
1. Color – the Most Important Factor
The color of a gemstone is often the most important factor for its value.
Relevant aspects are:
- Hue
- Saturation
- Tone
The most coveted colors are intense, vibrant, and clear – e.g., vivid red, neon pink, royal blue, intense green.
2. Clarity – How Clear Is the Stone?
Clarity describes whether inclusions are visible.
But be aware: In many colored gemstones, inclusions are normal and often part of their individual character.
- eye-clean → valuable
- minimal inclusions → accepted
- heavy inclusions → reduce brilliance
- For Character Stones, this understanding is redefined
3. Cut – The Dance of Light
A good cut determines whether a stone:
- sparkles
- shows depth
- appears color-intensive
- looks harmonious
Poor cuts can make even expensive stones appear dull.
4. Carat – The Weight
Carat = weight, not size.
The larger and purer a colored stone, the rarer and more valuable it is.
Especially for spinel, ruby, sapphire, and tsavorite, prices increase exponentially with size.
Natural versus Synthetic?
The Crucial Difference – Simply and Clearly Explained
Many people believe synthetic gemstones are "fake."
That's not true – they are real, but laboratory-grown.
Here's the clear distinction:
1. Natural Gemstones
- formed over millions of years in the earth
- have natural inclusions
- are limited & non-reproducible
- possess collector's value & identity
2. Synthetic Gemstones
- are created in a laboratory
- have an identical chemical composition
- often appear "perfect"
- are inexpensive, mass-produced, with no collector's value
3. Simulants
Stones that only optically resemble gemstones (e.g., synthetic spinel, glass, YAG).
→ not a gemstone, merely an imitation.
Why is natural always more valuable?
True nature is unique, non-reproducible, and full of character.
What types of gemstone treatments are there?
What is natural – and what you should know
Many gemstones are treated to improve their color or clarity.
This is not inherently bad, but it must be communicated openly.
Here's an overview of the most common treatments:
1. Heated
Very common for sapphire, ruby, aquamarine. Improves color & clarity.
→ Accepted & stable.
2. Unheated
Stones without any heat or intervention.
- extremely rare
- significantly more valuable
3. Diffusion
Color enhancement using chemical substances.
- undesirable, significantly reduces value.
4. Oil (Oiling – Emerald)
Fills small cracks, making the stone clearer.
- accepted, but should be declared.
5. Resin / Polymer (Fillings)
More significant interventions in the structure.
- significantly lower value.
6. Fracture Filling / Glass Filling
Fills cracks with glass.
- stabilizes, but massively reduces value.
Important:
A reputable dealer transparently declares every treatment.
What do "untreated" or "unbehandelt" mean?
"Untreated" means that the gemstone has not been heated, oiled, irradiated or otherwise treated to improve its color or clarity. It shows its 100% natural origin – exactly as it emerged from the earth.
Untreated gemstones are extremely rare and – for example, rubies, sapphires, zircons and certain tourmalines – are significantly more valuable because they show nature in its pure form.
For rubies or sapphires, sometimes >95% of all stones are treated (!!) to improve color and clarity. Untreated stones are therefore always a rarity.
Character-Gems focuses on nature – and consistently specializes in untreated gemstones.
How are the patterns and structures inside a gemstone formed?
The patterns inside are created by geological processes: temperature, pressure, mineral growth, fluid inclusions, microcrystals, and natural changes during crystallization. What we perceive as “character” are frozen moments of Earth's history – microscopic traces dating back millions of years. In the case of zircon, these structures even go back several billion years – a dimension that is almost incomprehensible.
High-End Gemstones vs. Character Stones - What's the Difference?
High-End Stones vs. Character Stones
Two worlds - two types of beauty.
In the world of gemstones, two equally valuable luxury segments exist today:
High-End Stones and Character Stones.
Both are coveted – but for entirely different reasons.
High-End Stones – Perfection of Nature
High-End Stones stand for:
- exceptionally intense colors
- high clarity
- rare origins (e.g. Burma, Mahenge, Ceylon)
- very little or no treatment
- strong brilliance
- limited availability in larger sizes
Examples: Vivid Red Spinel, Mahenge Pink, Cobalt Blue Spinel, Premium Sapphire.
These stones represent the classic luxury class – rare, stable in value, coveted by collectors worldwide.
Character Stones – The Soul Within
Character Stones captivate for a different reason:
- fascinating inclusions
- visible color clouds & structures
- individual inner worlds
- perfect motifs for macro art
- pure natural aesthetics without filters
They are not flawless – and that is precisely what makes them unique pieces.
A Character Stone tells a story, shows personality, and often appears more poetic than a perfect stone.
Why the difference is important
High-End Stones → stand for technical perfection, rarity, and classic value.
Character Stones → stand for individuality, depth, art, and uniqueness.
There are two ways to love gemstones:
- through prestige,
- or through personality.
Both are valuable – in their own way.
Which stone suits me better: High-End or Character Stone?
If you appreciate perfection, brilliance, and classic rarity → High-end Stone.
If soul, depth, natural art, and genuine uniqueness appeal to you → Character Stone.
Both are valid – your feeling is what matters.
What is the difference between "rare" and "unique"?
In the classic gemstone world, "rare" means:
- hard to find
- geologically limited
- mine-dependent
- hardly available on the market
For Character Stones, there is an additional factor:
"unique" = absolutely not reproducible
A classic 2-ct spinel can resemble another 2-ct spinel - a Character Stone never can.
- Rarity is a category.
- Uniqueness is a value in itself.
Why are spinels so valuable?
Spinel is one of the rarest colored gemstones available. It is almost always untreated, possesses a natural, strong brilliance, displays exceptionally intense colors (vivid red, neon pink, cobalt blue), and is found in only a few regions of the world.
Its rarity in top colors makes it more sought after than ever – by collectors as well as in the high-end gemstone world. Spinels from Myanmar/Burma are by far the most valuable, followed by Vietnam and Tanzania.
Why are highly pure spinels so rare?
Spinel forms under extreme conditions and high crystal tension – purity is therefore the exception. Pure, intensely colored spinels are among the rarities worldwide and are accordingly sought after. In combination with exceptional color quality and renowned origin, such as Myanmar (Burma), prices of up to 8,000 USD per carat are now being achieved for top stones with vivid red or vivid pink.
What makes a high-end spinel so special?
Spinels are almost always untreated, extremely rare in top colors, and are characterized by exceptional brilliance.
Vivid Red, Neon Pink, and Cobalt Blue spinels are among the most sought-after colored gemstones worldwide.
Spinels from Myanmar (Burma) are particularly valuable, followed by stones from Vietnam and Tanzania.
What are matching pair gemstones?
Matching Pair Gemstones are two perfectly matched stones, ideal for symmetrical jewelry pieces.
What are matching pairs used for?
They are frequently used for earrings, studs, or designs where uniformity is important. The more perfectly matched a pair is in terms of dimensions, coloring, and cut, the more valuable it is. For matching pairs, there is always a so-called "matching pair premium," which is priced according to the factors mentioned above. Perfectly matched pairs are extremely rare and sought after by jewelers.