1.71 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This oval shaped blue sapphire weighs 1.71 carats, and measures 7.74 by 5.85 by 4.48 millimeters, presenting an elegant length to width ratio of approximately 1.32, and a depth of about sixty six percent, proportions that contribute to a balanced face up presence and comfortable setting profiles. The gem is cut in a mixed brilliant style, combining a faceted crown that enhances scintillation with a pavilion arrangement designed to return light efficiently, and it carries an excellent polish that maximizes surface reflection and crisp facet junctions. Color is described as vivid blue in intensity, and the stone is transparent, with a clarity grade reported as very slightly included when evaluated at eye level, and the origin is certified as Ceylon Sri Lanka, a provenance prized for lively and saturated blue hues. Enhancement by heat treatment has been disclosed, a stable and widely accepted practice in trade that enhances color without compromising structural integrity, and The Natural Sapphire Company stands behind the gem description and certification for buyers seeking verified provenance and accurate grading information.

Clarity grading in this sapphire is especially relevant to how the gem performs optically, and the term very slightly included at eye level indicates that inclusions are minimal and do not materially interrupt light transmission when viewed with the unaided eye, although they may be more apparent under magnification. Because the stone is transparent and well proportioned, light enters the crown facets, reflects against the pavilion, and is returned to the viewer with strong brilliance, while the mixed brilliant cut geometry increases the number of small facet reflections that create lively scintillation during movement. The excellent polish reduces light leakage at the facet surfaces, creating cleaner, sharper flashes of light, and the oval outline spreads color evenly across the table while offering a flattering elongated look for jewelry. The combination of vivid color, high clarity at face up grading, and skilled facet arrangement produces a gem that appears lively and clean to a discerning buyer, a quality often sought by collectors and those commissioning bespoke jewelry.

When comparing reflective qualities to other gemstones in the blue category, several material properties are decisive, and sapphire sits advantageously because of its relatively high refractive index and hardness. Corundum, the mineral family to which sapphire belongs, has a refractive index higher than blue spinel and aquamarine, and slightly higher than tanzanite, which means that sapphire tends to exhibit stronger internal reflection and crisper facet return, translating into greater apparent brilliance. Compared with Kashmir and Burmese sapphires, Ceylon sapphires often display a brighter, more lively reflection pattern because their tones are typically lighter and clarity is higher, so light is returned with more sparkle rather than absorbed by a very deep body color or diffused by silk inclusions. Tanzanite, though prized for its strong pleochroism and bluish violet tones, has a lower refractive index and thus appears less brilliant in direct reflection than sapphire, and aquamarine and blue topaz generally show a paler body color and lower dispersion, resulting in less intense flash and less dynamic play of light. Blue spinel can display excellent luster and durable wear properties, but its lower refractive index and different crystalline structure mean it will not match a sapphire of comparable cut and clarity in terms of the intensity of internal light return, and while diamonds and gem quality white stones can exhibit significant fire due to higher dispersion, their colorless nature is a different category of optical appeal. The mixed brilliant cut of this Ceylon sapphire optimizes the inherent optical advantages of corundum, delivering reflections and scintillation that outperform many alternate blue gemstones in day to day wear, while the material hardness of nine on the Mohs scale ensures long term retention of polish and facet integrity.

For the educated buyer considering value and long term enjoyment, there are several reasons this sapphire is significant, and The Natural Sapphire Company presents it with transparent documentation and provenance. The one point seven one carat weight sits in a sweet spot where the gem is substantial enough to serve as a center stone while retaining strong per carat value, and the vivid color intensity combined with eye level very slightly included clarity and excellent polish yields a stone that is both visually striking and technically well graded. Ceylon origin is historically desirable for its bright, lively blues that photograph and wear exceptionally well, and disclosed heat treatment aligns with industry standards and preserves the gem for daily use. Practical considerations for jewelry include the oval shape and proportions which make this sapphire ideal for a solitaire ring, a halo setting that can enhance perceived size and color, or a three stone design paired with high quality accent diamonds to emphasize the blue. For collectors focused on liquidity and certification, provenance from Sri Lanka and clear disclosure of treatment increase marketability, while the robust durability of sapphire offers assurance for heirloom use. If you would like additional technical data, magnified imagery, or bespoke setting recommendations, The Natural Sapphire Company can provide detailed reports and guidance to help you place this Ceylon sapphire in the design and investment context that best suits your needs.