Description
From 3.50 ct Ratnapura Rough to a 2.30 ct Double-Sided Geometric Shield Cut Spinel
Some rough gemstones naturally lend themselves to familiar ovals, cushions or rounds. Others require a different approach. This natural spinel from Ratnapura village around mining in Sri Lanka began as a 3.50 ct alluvial rough with relatively low depth, making conventional cutting less suitable if the objective was to preserve the stone’s character and usable material.
The rough displayed a dark reddish-purple color with deep plum and magenta impressions. Rather than forcing a standard outline onto the material, City of Gem evaluated the original geometry and developed a custom design around what the stone itself allowed. This approach resulted in a distinctive geometric shield form with pentagonal influence and step-style faceting on both sides.
The finished gemstone weighs 2.30 ct and measures 9.9 × 9.6 × 2.7 mm. From the original 3.50 ct rough, the final recovery is approximately 65.7%, with about 34.3% of the original weight removed during shaping, faceting and polishing. For a shallow alluvial rough, this represents a strong transformation in which design, proportion and natural form were considered together rather than simply pursuing a conventional shape.
Its most unusual feature is the double-sided cutting concept. Instead of treating one side only as the traditional crown and the opposite side purely as a pavilion, the design gives both faces a deliberate geometric presence. Step-style facets frame the stone and emphasize its shield-like outline, while the broad central areas allow the deep reddish-purple body color to remain an important part of the visual character.
The spinel is natural and unheated, with loupe-clean clarity. Its deep plum-magenta tone changes in visual intensity depending on lighting, background and viewing angle, while the dark outer areas create contrast with the softer pinkish-purple reflections visible through the center.
Spinel is valued for its brilliance, durability and broad natural color range. In this example, however, the cutting story is as important as the color. The original alluvial form determined what the finished gemstone could become. Instead of removing excessive material simply to create a familiar commercial shape, the design followed the available depth and outline of the rough.
This source-to-finished process reflects an important part of City of Gem’s work. Working close to Sri Lankan gemstone source areas allows rough material to be evaluated before cutting, shaped according to its individual potential, and transformed into finished gemstones with a traceable connection between source, planning and craftsmanship.
At 2.30 ct, this finished natural Ratnapura spinel is suitable for custom jewellery, one-of-a-kind designer pieces, collector selections and gemstone buyers looking for cuts outside ordinary commercial shapes. Its shield-like architecture would be particularly interesting for bespoke rings, pendants or jewellery where the gemstone itself becomes the central design feature.
Sometimes the best cutting decision is not to make the rough conform to a standard pattern. It is to understand what nature has already provided and build the design around it. This double-sided geometric shield spinel is one example of that philosophy—from a shallow 3.50 ct alluvial rough to a distinctive 2.30 ct finished gemstone.
