2.73 Ct. Sky Blue Topaz from Ceylon (Sri Lanka)

This transparent 2.73 carat oval sky blue topaz measures 8.76 x 7.24 x 5.84 mm, and is presented with a mixed brilliant cut and an excellent polish, attributes that maximize table brightness and faceted scintillation. Clarity is recorded as very very slightly included when evaluated at eye level, providing a clean appearance to the naked eye while retaining natural character under magnification. The color presents as a light sky blue with even saturation across the table and pavilion, and the stone has been enhanced by irradiation to achieve and stabilize its blue tone. Origin is Ceylon, Sri Lanka, and this specimen reflects the localitys reputation for well formed crystals and appealing color. The Natural Gemstone Company documents the enhancement and origin clearly, and the stone is suitable for use as a center gem in a variety of settings where its measured proportions will provide an elegant face up presence.

When compared to more common gemstones, this topaz offers a distinct balance of brilliance and practicality, owing to its optical and physical properties. Topaz has a refractive index of approximately 1.61 to 1.64, which is higher than that of beryl varieties such as aquamarine, 1.57 to 1.58, and lower than corundum and diamond, with sapphire at around 1.76 to 1.77 and diamond at 2.42. Dispersion, the contributor to fire, is modest in topaz at about 0.014, similar to beryl and lower than sapphire at 0.018 and diamond at 0.044. In practical terms, the mixed brilliant cut and excellent polish of this sky blue topaz amplify light return and facet contrast, producing lively scintillation and a crisp, clean appearance that often reads as more brilliant than aquamarine in comparable sizes, despite similar dispersion values. The light color intensity enhances perceived brightness, and the reported very very slightly included clarity allows unobstructed light passage, which together make the gem stand out for its sparkle, clarity, and color harmony. With a hardness of 8 on the Mohs scale, topaz is durable for most jewelry applications, though it benefits from protective settings and routine care to avoid cleavage damage from sharp impacts and exposure to strong heat.