1.00 Ct. Greyish Blue Spinel from Ceylon (Sri Lanka)

This one carat cushion shape spinel from Ceylon is presented by The Natural Gemstone Company with exacting provenance and cut data, the specimen measures 6.28 x 5.82 x 3.65 mm, the resulting depth proportion is approximately 60 percent which yields a well balanced face up spread for a one carat cushion, the hue reads as a greyish blue with medium color intensity, the material is transparent and unenhanced, the clarity has been graded as very slightly included at eye level, and the polish is excellent throughout. The cushion outline displays gently rounded corners and a controlled pavilion height, attributes that are essential for predictable light return in non birefringent materials such as spinel. The absence of enhancement preserves the natural refractive characteristics of the stone, and the Sri Lankan origin is significant because Ceylon spinel often shows a refined interplay of blue and cool neutral tones without the over saturation seen in some heat treated material.

Cutting and finishing details are central to the performance of this gem, the cutter employed a mixed brilliant approach, combining a brilliant facet arrangement on the crown with a modified step or chequer pavilion, this hybrid scheme is chosen to generate both strong scintillation and broad flash, the crown facets act as the primary scintillation generators while the pavilion facet geometry controls the return of light and the contrast pattern, at the proportions reported the pavilion depth and crown height are in the range that minimizes windowing while maximizing apparent size, the facet junctions are crisp and symmetric which, together with the excellent polish, produces mirror like facet planes that enhance both brilliance and fire. The very slightly included clarity grade means that inclusions are minor and are not readily apparent face up at normal viewing distances, this clarity profile is ideal for a statement piece because it preserves visual transparency and contrast while avoiding the scattering that can dull a gem under jewelry lighting conditions.

From an optical and material science perspective this spinel benefits from the stable single refractive behavior of spinel and its strong index of refraction, the result is sharp facet reflections and a lively face up appearance even under mixed lighting, the greyish blue hue at medium intensity reads neutrally on the color scale which allows the gem to perform well against either warm or cool metal settings, the 6.28 by 5.82 mm table area presents as substantial on the finger which translates to perceived size beyond the numeric carat weight, the depth at 3.65 mm supports internal contrast and prevents the gem from appearing flat under direct light. The lack of pleochroism in spinel means the tone and saturation will remain consistent with orientation, this stability makes design planning straightforward for jewelers, the excellent polish reduces light loss due to surface abrasion and enhances the immediacy of the gem when examined under a loupe or at arm s length.

Taken together, the dimensions, clarity, and cutting strategy make this spinel particularly well suited to a single stone statement mounting, the nearly six millimeter face up dimensions yield a presence that reads confidently as a solitaire, the very slightly included grade ensures a clean visual field for the cushion facet pattern to display dynamic flashes without distracting inclusions, recommended settings include a four or six prong low profile solitaire that secures the corners while allowing maximum light entry from the pavilion, a halo mount will increase perceived diameter while emphasizing the greyish blue tone, and an open gallery or minimal bezel will preserve the superior light return driven by the mixed brilliant geometry. Because the gem is natural and unenhanced, the color and clarity will age predictably and are resilient under normal wear conditions typical of spinel which ranks high on the Mohs hardness scale.

At The Natural Gemstone Company we document these technical parameters so that designers and connoisseurs can make informed decisions, the combination of a disciplined mixed brilliant cut, a thoughtful depth proportion near sixty percent, and a very slightly included clarity evaluated at eye level yields a versatile and striking one carat cushion that performs as a statement piece. If you require additional measurements, facet diagrams, or guidance on mounting options to maximize the optical performance of this greyish blue Ceylon spinel, our team can provide technical notes and setting templates to assist in the creation of a finished jewel that fully leverages the stone s proportions and polish.