1.75 Ct. Purple Spinel from Ceylon (Sri Lanka)

This oval shaped purple spinel weighs 1.75 carats, and measures 7.99 by 6.15 by 4.62 millimeters, making it a well proportioned gem for a wide range of settings. Cut as a faceted stone with a mixed brilliant style, this spinel combines a brilliant crown with a faceted step pavilion to balance scintillation and color return. The clarity is graded eye clean at eye level, which means that under normal viewing the stone is free of visible inclusions, allowing light to flow through the crystal without internal obstruction. Color intensity is described as intense, and the polish is excellent, providing crisp facet junctions and a smooth surface finish that maximize light performance. The origin is Ceylon, Sri Lanka, a classic source for fine spinel, and there is no enhancement, which preserves the natural character and rarity of the material. As specialists at The Natural Gemstone Company we document these attributes carefully, because provenance, cut, and clarity together define the real value for an educated collector or connoisseur.

To understand why this stone sparkles in a way that few others can match, it helps to look at the material properties and the cutting geometry. Spinel is an isometric mineral with a cubic crystal structure, which means it is optically isotropic. The lack of birefringence yields singular, undistorted light behavior, so the reflections from each facet remain sharp and consistent as the gem is tilted. Spinel also has a relatively high refractive index for colored stones, which increases the internal reflection and brilliance. When an experienced lapidary applies a mixed brilliant cut to an isotropic material, the crown facets are angled to produce lively scintillation and flashing highlights, while the pavilion facets return a high proportion of light to the viewer, enhancing perceived brightness. Because the pavilion and crown are cut to complementary angles, the stone achieves a lively balance of brilliance, scintillation, and optical saturation. The excellent polish further reduces surface scattering, permitting strong undimmed refraction and crisp fire when light disperses through the small facet facets of the crown.

The specific dimensions of 7.99 by 6.15 by 4.62 millimeters place this oval in an ideal depth range for effective light return, the depth being harmonious with the average table and faceting pattern used in mixed brilliant cutting. The absence of visible inclusions at the eye clean grade means there is minimal disruption to the light path, so flashes of color and white light are unimpeded. The intense purple color, originating in Ceylon, benefits from the stone being natural and untreated, because unenhanced color is more highly prized among collectors who value geological authenticity and long term durability. Spinel rates eight on the Mohs hardness scale, which ensures good resistance to daily wear when set in rings or other jewelry, while the strong structural integrity reduces the risk of cleavage or chipping during normal use. These combined attributes, structural, optical, and physical, produce a degree of lively brilliance and color saturation that educated buyers will recognize as a hallmark of premium spinel material.

For a discerning buyer considering an investment quality colored gem, this 1.75 carat oval purple spinel represents a rare alignment of origin, clarity, cut, and natural color, all documented with no enhancement. The natural Ceylon origin contributes both historical provenance and access to some of the finest spinel material available, and the stone is cut and polished to industry standards that optimize light performance. At The Natural Gemstone Company we provide detailed measurements and objective grading observations, so you can evaluate the gem on its scientific and aesthetic merits. Whether you are selecting a center stone for a bespoke engagement design, adding a museum grade specimen to a private collection, or choosing a secure store of value in colored gemstones, this spinel combines technical excellence with natural beauty in a package that educated buyers will understand and appreciate.