18.89 Ct. Topaz from Ceylon (Sri Lanka)

One exceptional gem available from The Natural Gemstone Company is a transparent blue topaz, weighing 18.89 carats, cut in a classic emerald shape, with exact dimensions of 18.02 by 13.04 by 8.56 millimeters. The stone exhibits a vivid color intensity, an excellent polish, and a clarity grade described as very slightly included when evaluated at eye level. Origin is Ceylon Sri Lanka, a historic source for fine gem material, and enhancement by irradiation has been applied to achieve and stabilize the rich blue hue. Visually this topaz presents a large, commanding face up area that reveals a pure, saturated blue, well suited to ring, pendant, or bespoke high jewelry designs, while the emerald cut emphasizes clean lines and a controlled, elegant light return.

From a gemological perspective the attributes of this topaz are notable and straightforward for the educated buyer who values measured facts and clear disclosure. Topaz, with a Mohs hardness of 8, offers excellent wearability for daily jewelry while also being hard enough to resist most scratches. The refractive index of topaz lies in a narrow, well defined range, and its specific gravity contributes to the substantial feel of this near 19 carat example. The clarity grade being very slightly included at eye level indicates that inclusions are minimal, they do not detract from transparency or face up appeal, and they are consistent with natural growth features rather than treatments. The emerald cut, with its broad step facets, is particularly honest, it lays open the stone so color and clarity are easily appreciated, and in a topaz of this size the cut maximizes the elegant color zoning and the clean geometric appearance.

Enhancement by irradiation is a common and industry accepted practice for blue topaz, and it is fully disclosed for this gem. Irradiation alters the trace element states within the mineral lattice to bring out blue colors which are then often further stabilized by controlled heating. For modern irradiated topaz the color is generally stable under normal wear conditions, but customary precautions apply. Avoiding prolonged exposure to extreme heat, and avoiding harsh chemical baths, will preserve the vivid tone. For the buyer seeking independent verification, The Natural Gemstone Company recommends laboratory certification for high value pieces, and we will furnish detailed origin and treatment disclosure on request, because transparency about enhancement and provenance is essential to building trust and protecting long term value.

Why this stone can become a generational heirloom is a combination of material durability, classic design potential, measurable quality, and documented provenance. At 18.89 carats the topaz is rare in the trade simply by virtue of its size combined with eye level clarity and vivid color. The emerald cut is a timeless style that reads as refined and architectural across eras, ensuring that a piece set today will retain aesthetic relevance for decades. Structurally topaz is resilient enough for everyday wear when set thoughtfully, and the excellent polish means that facets can be reworked by a skilled lapidary if ever necessary, allowing future custodians to refresh the finish while retaining the original weight and character. Provenance from Ceylon Sri Lanka adds a narrative and a geographic anchor that collectors and families often value when establishing a legacy piece.

To ensure this gem endures as a treasured family asset, certain practical recommendations are provided. For settings consider protective designs that guard the corners of the emerald cut, such as bezel mounts or secure corner prongs, because these approaches reduce the risk of impact damage while preserving the visual profile. Routine maintenance should include periodic inspection of the setting, gentle cleaning with warm soapy water and a soft brush, and avoidance of extreme thermal shocks. Insurance and independent appraisal are advisable when a piece is intended as an heirloom, and The Natural Gemstone Company can assist with referrals for certified gemological documentation, bespoke design services, and long term care guidance. With proper design, disclosure, and maintenance, this Ceylon blue topaz will not only serve as a striking statement today, it can be passed through generations as a tangible family heirloom that blends scientific verifiability with enduring beauty.