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https://danugroup.lk/product/ceylon-natural-blue-sapphire-heart-3/

What is a Natural Unheated Blue Sapphire?

A natural unheated blue sapphire is a variety of corundum that has not received heat treatment to improve its color or clarity. These sapphires retain the appearance created entirely by nature, making them highly appreciated by gem collectors, jewelry enthusiasts, and buyers seeking untreated gemstones. Sri Lanka, known worldwide as the Gem Island, continues to produce some of the finest natural blue sapphires from its ancient alluvial deposits.

This beautiful 1.18 ct Natural Unheated Ceylon Blue Sapphire was cut from a 2.50 ct facet-grade alluvial rough sourced from Pelmadulla village around mining in Sri Lanka. Before cutting, the rough displayed an attractive natural blue body color together with a shape that suggested excellent cutting potential.

Many cutters initially believed the orientation of the rough would produce a finished stone close to one carat or slightly below. However, by carefully studying the crystal shape, natural color distribution, and internal structure, our team saw the possibility of preserving more weight while achieving an elegant heart shape. Through careful planning and precision cutting, the finished gemstone weighs 1.18 ct, exceeding the original expectations while maintaining excellent proportions.

The finished gemstone measures 6.47 × 6.15 × 3.94 mm, features a Heart Mixed Cut, displays an attractive natural blue color, and shows VVS clarity, allowing light to move beautifully throughout the stone.

The sapphire remains completely natural and unheated, preserving the characteristics developed naturally over millions of years beneath the earth before being discovered from Sri Lanka's gem-bearing alluvial gravels.

Following cutting and polishing, the gemstone underwent professional examination by GGTL (Gem Testing Laboratory) using advanced gemological testing, including origin determination and treatment analysis. The laboratory confirmed the gemstone as Natural Corundum – Unheated Blue Sapphire of Sri Lankan (Ceylon) Origin.

The certificate was supervised by experienced gemologists:

Mrs. Sushita Malkanamage (FGA, BSc, MGA (SL), MSc (Gemology), GIA Alumni Member)

Mr. S.A. Saranga Dharmasiri (FGA (UK) Dip. (Gemology), University of Moratuwa, Gemologists' Association of Sri Lanka, GIA Alumni Member)

At Danu Group, every gemstone follows a transparent journey—from direct sourcing in Sri Lanka's mining villages to cutting, polishing, certification, and final presentation. This close connection with the source allows us to preserve not only the gemstone itself but also its complete story.

This elegant Ceylon sapphire set brings together a 1.00 carat unheated purple sapphire center stone and a round sapphire pair, creating a balanced layout for jewellery design. The center stone measures 6.39 × 5.2 × 3.7 mm and has been fashioned in a cushion step cut, allowing the purple body color to appear with a calm, refined character. Depending on the light and viewing angle, purple sapphire can show slightly different tones to different eyes, giving the stone a natural and personal visual feeling.

The center sapphire carries a “Rebecca purple” appearance, with VS clarity and a soft but noticeable presence. Its cushion shape makes it suitable for ring, pendant, or custom jewellery designs where the main stone needs to feel elegant without being overly large. The step-style cutting gives the gemstone a clean face-up structure, while preserving a calm depth that works well with purple sapphire.

The two round accent sapphires weigh 0.44 carats total and measure approximately 3.6 mm each. They are standard heated, VVS clarity stones, finished in a round flower cut with a Portuguese-style pavilion. Their cutting style adds sparkle and detail beside the center stone, making the full set suitable for three-stone jewellery layouts, side-stone ring designs, or a refined pendant concept.

All stones are from Ratnapura village around mining in Sri Lanka, a historic gem-bearing region known as part of Ceylon’s long gemstone heritage. Sri Lanka has supplied natural corundum, including sapphire in many colors, to the global gemstone market for generations. This set reflects that heritage through both the unheated center stone and the carefully matched accent pair.

 this 6.60 ct unheated lavender blue spinel was carefully planned, cut, and polished into a clean cushion gemstone above 2.60 ct. Its soft lavender blue color and gentle violetish pink shift reveal the hidden character of natural spinel.

Here, gemstones are checked directly with customers from France — close to the source, close to the process, and close to the people who understand each stone.

A rare natural alexandrite crystal from Rambuka village around mining in Sri Lanka, showing glassy transparency, excellent luster, visible natural growth marks, and a remarkable twin-like crystal appearance.

Some gemstones are admired for their polished brilliance, while others are treasured because nature has already shaped them into something extraordinary. This Ceylon Natural Chrysoberyl Sixling Crystal is one of those rare examples, where the beauty is not created by cutting, but by the crystal’s own natural formation.

This natural Chrysoberyl crystal weighs 4.12 carats and measures 8.3 x 9.8 x 6.8 mm. It was found in Kolonna village around mining in Sri Lanka, a country historically known as Ceylon and respected worldwide for its long gemstone heritage. Sri Lanka is especially known for sapphires, chrysoberyl, spinel, garnet, zircon, and many other natural gemstones formed through ancient geological processes.

The most important feature of this specimen is its sixling crystal formation, also known as cyclic twinning. Instead of growing as a simple single crystal, Chrysoberyl formed with a natural repeated structure that creates a flower-like or petal-like appearance. In the local gemstone market, stones like this may sometimes be called flower crystal, butterfly crystal, or petal crystal because of the way the crystal sections appear to spread outward like natural wings or petals.

Its yellowish green color gives the specimen a soft natural glow, while the surface lines, internal features, and growth marks show the original character of the crystal. These natural features are not defects in this category. For collectors and gemological students, they are part of the identity of the specimen, helping show how the crystal grew inside the earth before it was discovered.

This crystal is unheated, which adds further importance to its natural condition. No treatment has been used to change its appearance, allowing the collector to appreciate the stone as nature formed it. For rare crystal specimens, natural formation, origin, and preservation are often more meaningful than cutting potential.

Although this is not presented as a faceted jewellery gemstone, a well-preserved crystal like this can still inspire collectors, gemstone designers, and fine jewellers. It may be kept as a mineral specimen, used in a gemstone collection, studied for its formation, or presented in a custom display-style jewellery concept where the natural crystal shape is respected.

A fine gemstone collection is not always about one color or one shape. Sometimes, its beauty comes from variety, balance, and the way different stones speak together in one complete layout. This Sri Lanka and Madagascar natural mixed sapphire collection is a good example of that idea. With 25 faceted gemstones and a total weight of 69.00 carats, this parcel brings together a wide range of colors, shapes, and visual moods, giving jewellery designers a flexible and inspiring selection for custom work.

The stones range from approximately 4.00 carats to 1.90 carats each, making the parcel especially useful for jewellery planning where size presence matters. Within the collection, there are 11 pieces above 3 carats, 13 pieces above 2 carats, and 1 piece above 1.90 carats. This gives the parcel a strong design advantage because the stones are not too small for individual settings, while still offering enough variety for matched layouts, statement pieces, rings, pendants, earrings, or multi-stone jewellery concepts.

The color range is one of the most attractive parts of this collection. Blue, yellow, pink, purple, green, orange, red, and other fancy tones appear together in a way that feels lively but still balanced. For a jewellery designer, this kind of parcel works almost like a natural color palette. Some stones can be used as center stones, while others can support a layout through contrast, harmony, or tone variation. The mixed faceted shapes also add design freedom, allowing each stone to be placed according to its own character rather than forcing the entire collection into one fixed style.

Sri Lanka and Madagascar are both important gemstone sources with strong reputations in the colored stone world. Sri Lanka, historically known as Ceylon, is respected for its long gemstone heritage, especially natural sapphires and fancy-color corundum. Madagascar has also become an important source for attractive sapphire material, often producing a wide range of colors suitable for modern jewellery design. A collection combining both origins gives buyers and designers access to a broader gemstone story while still keeping the parcel focused on natural corundum.

This collection includes both heated and unheated stones, which is clearly stated for transparency. In the sapphire trade, heated stones are widely accepted when properly represented, while unheated stones carry their own natural appeal. What matters most is honest description, good clarity, attractive color, and practical jewellery potential. With VS to clean clarity, this parcel has the kind of visual quality that makes it suitable for serious design work and collector interest.

For fine jewellers, this collection offers possibility. It can become a group of individual custom pieces, a coordinated jewellery set, or a colorful design story built around natural sapphire variety. For collectors, it represents a beautiful mixed sapphire parcel with strong color diversity and respectable size presence. For buyers looking for gemstone layouts, it gives flexibility without losing quality.