Three Stone Blue Cobalt Spinel Ring 2.25 Ct., Platinum 950

This ring centers on a transparent 2.25 carat cobalt spinel cut into a precise emerald shape, with dimensions 8.12 x 6.20 x 4.79 mm, and an emerald cut faceting scheme optimized for step facet symmetry and color return. The emerald cut employs broad table and parallel step facets on the crown and pavilion to create a hall of mirrors effect, which in this specimen serves to deepen and saturate the intense blue body color while maintaining controlled light return. The clarity is reported as very very slightly included, evaluated at eye level, meaning the stone reads clean to the naked eye with only minute inclusions apparent under moderate magnification, preserving the stone s visual transparency and crisp facet junctions. Excellent polish has been executed across the table, crown, girdle, and pavilion facets, producing sharp facet edges and minimal surface diffusion, which enhances face up brightness and the lucid blue tone imparted by cobalt chromophores. The Ceylon provenance is significant, as Sri Lankan spinels are known for their clean crystal habit and consistent color saturation, and in this piece the cutting proportions were selected to balance depth, table size, and pavilion geometry to achieve both strong color saturation and controlled scintillation.

Flanking the center stone are two white tapered baguette diamonds, natural in origin, with a combined approximate weight of 0.34 carats. These side stones are graded in clarity as Very Slightly Included across VS1 and VS2 designations, and in color grade as F, which provides a near colorless white field to contrast and frame the saturated blue of the cobalt spinel. The tapered baguette is a linear step cut with elongated facets that run parallel to the long axis of the stone, which minimizes dispersion and emphasizes clean lines and contrast. When set as shoulder stones, the tapered profile creates a graduated optical transition from the center emerald cut table to the shoulders of the shank, preserving the geometric language of step cuts while adding visual elongation. The proportions and matching of the baguettes were selected to maintain optical symmetry and to prevent color leakage, ensuring that the high clarity grades remain effectively eye clean, and that the F color grade reads colorless when viewed next to the cool blue of the center spinel.

The entire mounting is executed in platinum 950, chosen for its high density and mechanical stability, which is ideal for the precise prong work required by an emerald cut center stone and tapered baguette shoulders. The design features a four prong head for the center stone, with prong geometry calculated to protect the delicate corners of the emerald cut while allowing sufficient light to enter the pavilion. The tapered baguettes are set into stepped shoulder galleries that are milled and hand finished to align facet axes with the center stone, enhancing line continuity and register. Fabrication begins with CAD driven proportioning followed by lost wax casting in platinum 950, then progresses to meticulous hand setting, where prongs are seated and burnished to secure each stone without disturbing facet polish. Final finishing includes a mirror polish on the band and a controlled surface finish within the gallery to optimize contrast and reduce unwanted reflections. The result is a ring in which metallurgy, prong geometry, and stone orientation are engineered to maximize security, optical performance, and long term wearability.

Ethical sourcing and supply chain transparency are central to the provenance of this ring, and The Natural Gemstone Company stands behind the origin of each component. The cobalt spinel is responsibly sourced from Sri Lanka, where we maintain direct relationships with miners and cutting partners to ensure traceability from mine to finished gemstone, and to support fair labor practices and community investment programs. The natural diamonds are procured through vetted suppliers who adhere to international best practices for conflict free sourcing, and we apply rigorous due diligence and chain of custody documentation throughout procurement. The platinum 950 is sourced from refiners who comply with recognized responsible sourcing protocols, and where possible we integrate recycled platinum into our production to reduce environmental impact. Each ring is accompanied by full provenance information and gemstone documentation on request, and our in house gemological team verifies cut, clarity, and color to maintain consistent quality standards. The Natural Gemstone Company offers this ring for clients who demand technical precision in cutting and setting, and who also require clear and verifiable ethical credentials for the materials that compose their jewelry.