#gemstonedelar

Every exceptional gemstone begins with a story. This natural unheated Orange Sapphire started as a 6.00 carat facet-grade alluvial rough discovered in Endana village around mining in Sri Lanka. Through careful planning, precision cutting, and respect for the crystal's natural beauty, it became a stunning 3.10 carat oval gemstone with a remarkable 51.7% weight recovery.

Discover how geology, craftsmanship, and transparency came together to create this rare treasure—from rough crystal to finished gemstone.

This 1.18 ct Natural Unheated Ceylon Blue Sapphire began as a 2.50 ct facet-grade rough sourced from Pelmadulla village around mining in Sri Lanka. Carefully planned, precisely cut, and professionally certified, it represents every stage of its journey.

From the source to your hand. Every step guided by us.

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A living moment trapped in sapphire for millions of years. This natural unheated Ceylon blue sapphire crystal from Kataragama, Sri Lanka, carries a rare eye-visible two-phase fluid inclusion with a moving gas bubble inside. Its glassy blue body, natural hexagonal crystal form, and preserved internal feature make it a meaningful collector-grade gemstone specimen for gemology lovers and natural sapphire collectors.

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.