1.37 Ct. Color Change Sapphire from Tanzania

One transparent 1.37 carat cushion shape color change sapphire is presented with precise dimensions of 6.62 x 5.17 x 4.03 mm, a mixed brilliant cut, a clarity grade of very slightly included as evaluated at eye level, vivid color intensity, and an excellent polish, with no enhancement reported, and an origin of Tanzania, as supplied by The Natural Sapphire Company. The cushion outline offers softened corners and broad facets that balance brilliance with a generous color face up, while the mixed brilliant cutting style combines smaller crown facets with larger pavilion facets to optimize both scintillation and depth of color. The stone is fully transparent, and its eye level clarity allows for minimal internal characteristics that do not detract from visual appeal, supporting a clean presentation in a variety of mounting styles. As a color change sapphire, the gem displays distinctive color shift behavior across lighting environments, presenting a deep blue tone under fluorescent lighting and a strong purple or violet hue under incandescent lighting, a quality that can be emphasized or contrasted through careful selection of setting design and metal type.

The proportions of this sapphire, including its 4.03 mm depth, yield a balance between on finger presence and low profile, which supports multiple approaches to setting. Mounted in a solitaire ring, the gem sits with an assured presence while maintaining an elegant silhouette that suits everyday wear. In a halo design, the cushion shape benefits from a fine array of small accent stones, which magnify perceived size and enhance the stone’s color change by increasing surrounding light return. For bezel or low crown settings, the measured depth and durable corundum hardness provide protection for frequent wear, while allowing the pavilion facets to refract light effectively through the crown. The mixed brilliant facet arrangement means the stone responds well to both open prong settings that maximize table exposure and closed settings that offer greater security, giving designers and clients latitude to prioritize visual drama or functional protection according to intended use.

Customization options available for this sapphire include classic single stone rings, engagement pieces with accent diamonds or colored sapphires, and more contemporary concepts such as east west mounting or asymmetrical cluster arrangements. Metal selection is a primary design lever for controlling the perceived color. White metals, such as platinum or 18 karat white gold, create a cool backdrop that accentuates the blue appearance under cooler light sources, providing a crisp, modern aesthetic. Yellow gold and rose gold introduce warm reflections that tend to emphasize the purple shift under warmer light, and these metals can be used to heighten the gem’s color change character or to complement a wearer’s complexion. Accent stones may be chosen to either contrast or harmonize with the sapphire, including white diamonds for brightness and clarity, light pink sapphires for a tonal palette, or deeper blue sapphires for complementary richness. Design treatments such as a fine pavé band, tapered baguette shoulders, or a double halo give additional options to control sparkle, scale, and visual balance without obscuring the sapphire’s core color behavior.

Practical considerations important to customization include the gem’s no enhancement status, which assures its natural color origin and contributes to long term stability and provenance, and the stone’s very slightly included clarity, which supports secure prong placement without risk of cleavage or undue stress at the girdle. The Natural Sapphire Company recommends that mounting be undertaken by experienced craftsmen who can align prongs to support the stone at the girdle and crown, and who can tailor bezel wall thickness or prong profiles to suit the stone’s exact measurements. The sapphire’s durability makes it well suited for daily wear in rings and bracelets, and equally appropriate for pendants, stud or drop earrings, and high quality cufflinks, where controlled settings can showcase the color change as the piece moves through different lighting conditions. General care is straightforward, warm soapy water and a soft brush are recommended for routine cleaning, while professional servicing ensures prongs remain secure and metal finishes retain their intended appearance over time. For clients seeking bespoke work, The Natural Sapphire Company can provide tailored design guidance that aligns the gem’s optical properties, physical dimensions, and natural origin with the functional demands and aesthetic priorities of the final piece.