0.67 Ct. Yellow Sapphire from Ceylon (Sri Lanka)

At The Natural Sapphire Company we select and present gemstones with full technical transparency and a focus on wearable beauty, and this transparent 0.67 carat oval yellow sapphire exemplifies that approach. Weighing 0.67 carats and measuring 6.39 x 4.34 x 2.89 mm, this gem is cut to an elegant oval outline that flatters many mounting styles, from classic four prong solitaires to more contemporary east west settings. The mixed brilliant cut balances large facets on the crown with smaller pavilion facets to maximize return of light and scintillation, giving the stone a lively play of brilliance and sparkle. The light color intensity of the yellow body color makes this sapphire distinctly bright without being overpowering, so it reads as a refined, sunny presence in either large or delicate jewelry. The stone has an excellent polish which enhances light return from the table and crown facets, producing clean, crisp flashes that will draw the eye in most lighting conditions.

Color origin and treatment are central to any informed purchase decision, and this sapphire comes from Ceylon Sri Lanka, a classic source noted for producing sapphires with delicate and appealing pastel tones. The gem has been treated by beryllium diffusion to enrich and stabilize its yellow hue. Beryllium diffusion is a high temperature treatment that introduces small amounts of beryllium into the sapphire lattice to shift color. When properly applied the result is a permanent color modification that does not fade with normal wear, and it is widely accepted in the trade when fully disclosed. That said the presence of diffusion does affect market value relative to comparable untreated material, so we state this treatment clearly so a buyer can weigh aesthetics, budget, and long term value. For buyers who prioritize untreated natural color, Ceylon material can still be found without diffusion, however beryllium diffusion allows collectors and designers to access exceptionally pure and evenly distributed yellow tones that are difficult to find naturally at this size and clarity grade.

Clarity and cut quality are the other pillars that determine how a gemstone will perform in jewelry, and this sapphire is graded as very very slightly included evaluated at eye level. In practical terms this means when you view the stone in normal wearable contexts there are no eye visible inclusions to distract from the freshness of the color and the brilliance generated by the mixed brilliant cut. Under magnification minor pinpoint and feather inclusions may be present, and these are typical for natural corundum, but they do not materially affect the gem clarity to the naked eye. The mixed brilliant faceting pattern has been executed to harmonize dispersion and scintillation, giving lively small flashes on movement and broader flashes of brightness when light hits the table. The oval proportions of 6.39 by 4.34 mm mean that the gem exhibits an appealing length to width ratio that will visually elongate a finger in ring form, and the modest depth of 2.89 mm keeps the table broad for strong face up presence. Excellent polish further increases the contrast between bright facets and dark facet junctions, lending the gem a crisp, finished appearance when set.

For the educated buyer considering value, this sapphire represents an interesting intersection of quality and accessibility. Value in sapphire is driven by color, clarity, cut, carat weight, and origin, with color typically being the most important single factor. Here the light yet vivid yellow tone is attractive and versatile, clarity is strong at a very very slightly included grade evaluated at eye level, cut and polish are excellent, and the Ceylon origin is highly regarded. The beryllium diffusion treatment does alter the grading narrative and generally places the gem in a different pricing bracket compared with untreated stones of similar hue and clarity. Buyers should therefore consider how they prioritize natural untreated provenance versus the vivid, even color achieved through diffusion. We recommend third party documentation for any high value purchase, and The Natural Sapphire Company can assist in arranging independent lab reports from respected gemological laboratories that document origin, treatment status, and other important characteristics. Full disclosure of treatment is a cornerstone of our service, and we will include detailed information so that you can compare like for like across the market.

Practical considerations for wear and setting are straightforward with this sapphire, and its attributes make it highly adaptable to many design concepts. In yellow or rose gold the warm yellow tone will integrate and intensify the perceived warmth, producing a halo effect of soft golden radiance. In white metals like platinum or white gold the yellow creates a crisp contrast that makes the color appear purer and more saturated, which can be useful when the design aims to emphasize the stone as a focal point. A well proportioned bezel can protect the girdle while preserving face up size, and a four or six prong setting will maximize light entry for optimum brilliance. For care, beryllium diffused sapphires are considered stable for normal jewelry use, however we advise caution with aggressive re polishing or high temperature work during repair because extreme heat and certain chemicals used in some industrial processes could affect surface layers that were modified during diffusion. Routine cleaning with mild detergent and warm water, and professional inspection of the setting annually, will keep the stone secure and brilliant. If you would like a lab certificate, additional photographs, or suggestions for settings that best showcase this radiant Ceylon yellow sapphire, The Natural Sapphire Company is available to advise on design, secure mounting, and certification to ensure you receive a gemstone that meets both aesthetic preferences and long term expectations.