Pretty Blue Sapphire Crystal 12.11 carats - MADAGASCAR - Height: 10 mm - Width: 9 mm- 2.42 g - (1)

Discover this magnificent 12.11-carat natural rough sapphire from Madagascar, one of the world’s most renowned sources for the richness and diversity of its precious stones.

This superb specimen stands out for its intense blue color, combining magnificent shades of royal blue, deep blue, and luminous azure.

Under transmitted light, the crystal reveals particularly captivating color depth, displaying a remarkable internal architecture of growth lines, natural inclusions, and variations in transparency.

Its compact, almost rectangular shape gives it an imposing presence despite its relatively modest dimensions.

One of this stone’s most interesting features is the distribution of its color: the upper areas show a deeper blue, while the lower areas become especially luminous as light passes through the crystal.

This combination creates a striking aesthetic contrast and highlights the sapphire’s natural structure.

Weighing 12.11 carats and measuring 10 × 9 × 8 mm, this stone has a fine thickness and substantial volume for a rough specimen.

A particularly appealing piece for collectors of natural gemstones, corundum enthusiasts, and mineralogy aficionados.


Technical specifications

- Gemstone: Natural rough sapphire
- Mineral family: Corundum
- Origin: Madagascar
- Weight: 12.11 carats (2.422 grams)
- Dimensions: 10 × 9 × 8 mm
- Color: Intense blue, with royal blue and azure shades
- Transparency: Translucent under transmitted light, with visible inclusions
- Shape: Compact rough crystal, approximately rectangular in shape
- Luster: Vitreous on some surfaces
- Chemical composition: Al₂O₃
- Hardness: 9 on the Mohs scale
- Condition: Rough, with growth structures, inclusions, and natural fractures
- Intended use: Mineral collection, gemology, lapidary study


Madagascar – A legendary land of precious stones


Madagascar holds an exceptional place in the history and international trade of precious stones.

Located in the Indian Ocean off the eastern coast of Africa, this vast island has an extraordinary geological heritage shaped by several hundred million years of evolution.

Once part of the supercontinent Gondwana, Madagascar experienced significant tectonic and metamorphic processes that helped form numerous deposits of precious minerals.

Its subsoil contains sapphires, rubies, tourmalines, garnets, aquamarines, and many other sought-after gemstones.

The modern history of Malagasy sapphires took a major turn during the 1990s, when several important discoveries drew the attention of international traders.

In 1998, the discovery of the vast deposits at Ilakaka in southwestern Madagascar profoundly transformed the global sapphire market.

Within a few years, the region became one of the major centers for the extraction and trade of natural sapphires.

Thousands of prospectors arrived in the region, giving rise to mining activity on an exceptional scale.


Other localities in Madagascar have also gained international renown, including:

- Ilakaka and Sakaraha: famous for their extensive alluvial deposits and the diversity of their sapphires.
- Andranondambo: a historic region particularly known for its magnificent blue sapphires.
- Andilamena: renowned for its corundum deposits, especially rubies.

Madagascar’s sapphires are now prized for their extraordinary range of colors.

Blue, pink, purple, yellow, and orange stones can be found there, as well as specimens displaying several colors within a single crystal.

Some high-quality stones can rival sapphires from historically prestigious regions such as Sri Lanka or Kashmir.

Madagascar has thus become one of the world’s essential sources in gemology.


Superb royal blue color with luminous reflections


One of this specimen’s most appealing features is its magnificent blue color, particularly intense under transmitted light.

The crystal is predominantly royal blue, accompanied by lighter shades and deep blue areas.

The upper part shows a rich color, while the lower areas allow more light to pass through, revealing magnificent azure reflections.

This natural distribution of color creates particularly intriguing visual depth.

The blue tones of sapphire are primarily due to traces of iron and titanium within its crystal structure.

Interactions between these elements are responsible for the different blue shades characteristic of this precious stone.

For centuries, blue sapphires have ranked among the most admired and sought-after gemstones.

Colors evoking royal blue are particularly admired for their intensity and elegance.

This specimen displays a color reminiscent of these prestigious tones, although the official gemological classification “Royal Blue” cannot be established from photographs alone.

A magnificent rough stone whose color is one of its main aesthetic attractions.


12.11 carats – A particularly interesting crystal shape


At 12.11 carats, this sapphire has a fine presence for a rough crystal.

Its dimensions of 10 × 9 × 8 mm give it a compact and particularly thick shape.

Its almost rectangular silhouette highlights several crystal faces, with relatively geometric contours.

Under transmitted light, the stone reveals a particularly fascinating internal structure.

Numerous growth lines and natural inclusions run through the crystal, creating a complex network of patterns.

Some inclusions appear as small dark spots, while the growth structures form lines and internal variations that are particularly visible.

These features bear witness to the natural conditions in which the crystal developed.

The light also reveals areas of varying transparency, enhancing the depth of the blue color.


This specimen is notable in particular for:

- Its substantial weight of 12.11 carats.
- Its magnificent intense blue color.
- Its royal blue and azure shades.
- Its compact, geometric shape.
- Its considerable thickness of 8 mm.
- Its translucency under transmitted light.
- Its many visible growth structures.
- Its characteristic natural inclusions.
- Its origin in Madagascar, renowned worldwide for its sapphires.

The combination of these features makes it a particularly interesting piece for a collection dedicated to natural corundum.


An exceptional geological formation


Sapphire belongs to the corundum family, minerals composed primarily of aluminum oxide, with the chemical formula Al₂O₃.

With a hardness of 9 on the Mohs scale, it is among the natural minerals most resistant to scratching.

This remarkable hardness explains its historic use in jewelry and in certain industrial applications.

Natural sapphires can form in different geological environments, including certain metamorphic rocks and settings associated with magmatic processes.

In Madagascar, ancient geological transformations helped create numerous corundum deposits.

During crystallization, sapphires can incorporate various chemical elements, develop inclusions, and display color variations.

Changes in growth conditions can also leave characteristic internal structures.

On this specimen, these features are particularly visible under transmitted light.

The many lines and inclusions create a complex internal architecture, offering a fascinating glimpse into the crystal’s geological history.

Each natural sapphire therefore has its own unique structure, shaped during its formation.


Rough sapphires from Madagascar – Pieces prized by collectors


While cut sapphires are particularly sought after in jewelry for their brilliance and color, rough crystals offer a different kind of mineralogical interest.

They make it possible to observe the natural characteristics of corundum directly, including its shape, crystal faces, and internal structures.

Collectors particularly appreciate specimens with beautiful color, an interesting shape, and a recognized origin.

This sapphire from Madagascar brings together several of these qualities.

Its intense blue immediately draws the eye, while its many inclusions and growth lines offer a wealth of details to observe.

Its weight of over 12 carats and compact shape also enhance its appeal as a collector’s piece.

It would be at home in a collection devoted to rough gemstones, corundum, or minerals from Madagascar.

It is also an interesting specimen for gemological study.

Any lapidary work would, however, require a thorough examination of the visible inclusions and fractures to assess the cutting possibilities and potential yield.

Keeping this stone in its rough state also preserves its natural mineralogical characteristics.


A sapphire steeped in history and symbolism


Since antiquity, sapphires have held a privileged place among precious stones.

Their blue color has long been associated with royalty, wisdom, nobility, and fidelity.

Over the centuries, these gemstones have adorned many prestigious pieces of jewelry, crowns, and historical objects.

Even today, blue sapphires remain among the world’s most iconic precious stones.

Rough crystals reveal another facet of their beauty: the stone as it formed naturally.

This specimen from Madagascar perfectly illustrates this appeal, with its intense color, geometric shape, and numerous internal structures.


Conclusion – A magnificent 12.11-carat blue sapphire from Madagascar


This exceptional natural rough sapphire from Madagascar, weighing 12.11 carats and measuring 10 × 9 × 8 mm, stands out for its superb intense blue color, royal blue shades, and particularly fascinating crystal structure.

Its translucency under transmitted light reveals numerous inclusions and growth lines, creating a complex and attractive internal architecture.

Its compact shape, substantial weight, and renowned origin make it a magnificent piece for gemstone collectors and mineralogy enthusiasts.

A remarkable 12.11-carat rough sapphire, combining the intensity of blue, the beauty of natural crystals, and Madagascar’s exceptional gemological heritage.




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