7.13 Ct. Bi Color Sapphire Crystal from Ceylon (Sri Lanka)

This listing describes a single, naturally occurring bi color sapphire of 7.13 carats, offered by The Natural Sapphire Company. The gem presents a semi transparent appearance and an organic, various shape profile, with measured dimensions of 18.70 by 7.40 by 6.70 mm. The stone has been worked with a rough crystal cut that preserves much of the original crystal form, producing an unorthodox silhouette while providing a polished finished surface. Clarity has been evaluated at eye level and is graded as included, a characteristic consistent with sapphires that retain much of their natural crystal structure. Color intensity is assessed as medium, and the surface finish is described as excellent polish. There has been no enhancement applied to this stone, and its reported origin is Ceylon, Sri Lanka, a region known for producing a broad range of sapphire color expressions.

The most notable visual characteristic of this specimen is its bi color presentation, with a primary field of cool blue grey tones transitioning toward warmer golden to amber accents at one or both terminations of the crystal. The medium color intensity allows the two color zones to remain distinct without one overpowering the other, offering subtle contrast and visual complexity. As a semi transparent material, the stone allows partial light transmission, yielding depth within the blue grey core and a softened glow through the warmer zones. The rough crystal cut gives the gem an organic optical response, where light is returned through facets and natural planes rather than through a conventional faceted pavilion. The excellent polish enhances surface luster and tactile smoothness, presenting a refined finish that complements the natural form and the bi color character.

From a clarity and structural perspective, the included grade indicates the presence of internal features visible at normal viewing distances, which may include mineral inclusions, rutile needles, or growth zoning that are commonly encountered in Ceylon sapphires. These internal features contribute to the gemological identity and natural provenance of the stone, and they may also interact with the bi color zoning to produce subtle internal patterns. Despite visible inclusions, sapphires are corundum and retain high durability, with a Mohs hardness of 9, making them suitable for a wide range of jewelry settings when secured properly. The absence of enhancement is an important attribute for collectors and connoisseurs who prioritize untreated material, and this stone should be treated as a natural specimen with care recommended for any jewelry use, including routine inspections of the setting to ensure long term security.

Provenance and presentation are integral to the assessment of this sapphire. Origin information attributing the gem to Ceylon, Sri Lanka, aligns with the observed color palette and internal characteristics commonly associated with material from that area. The Natural Sapphire Company provides this specimen with standard documentation of its described attributes, and this stone is suitable for incorporation into bespoke jewelry designs, collector cabinets, or as a study piece for gemological reference. Its dimensions and unique shape invite creative mounting approaches that can emphasize the bi color transition and the rough crystal aesthetic. For practical considerations, routine care recommendations include avoiding exposure to harsh chemicals and extreme temperatures, and cleaning with warm soapy water and a soft brush when necessary. The combination of natural bi color zoning, an unenhanced state, and the physical dimensions of 18.70 by 7.40 by 6.70 mm make this 7.13 carat sapphire a distinctive example within a natural sapphire collection.