15.70 Ct. Amethyst from Ceylon (Sri Lanka)

This is a superior example of Ceylon amethyst offered by The Natural Gemstone Company, presenting a transparent, Other certified purple gem weighing 15.70 carats, and cut to an elegant oval shape. The stone measures 18.71 x 15.16 x 10.15 mm, a substantial spread that reads beautifully when set as a centerpiece. The cutter used a mixed brilliant style, combining a faceted crown that maximizes table brilliance with a pavilion configuration that enhances scintillation and return of light. The clarity grade is described as very slightly included, evaluated at eye level, which means that the inclusions are minor and do not detract from the gem when viewed without magnification. Color is vivid, with rich purple saturation that is evenly distributed across the stone, and the finish shows an excellent polish that gives crisp facet junctions and lively surface luster. Importantly for discerning buyers who value natural material, there has been no enhancement to this amethyst, and its Ceylon origin contributes to both its character and market desirability.

For an educated collector or a custom jeweler, the attributes of this amethyst align with the principal drivers of value in colored gemstones. Color is the most significant factor, and the vivid intensity of this stone places it in a premium tier, because saturated yet balanced purple hues are sought after among amethyst connoisseurs. Clarity evaluated at eye level as very slightly included indicates that the gem offers excellent transparency and light performance, while retaining natural inclusions that confirm authenticity without undermining beauty. The mixed brilliant cut is a technical choice that improves perceived brilliance while preserving weight, so the gem delivers strong face up brilliance and scintillation despite its generous depth of 10.15 mm. The substantial weight of 15.70 carats paired with an oval outline gives a large face up appearance, making the stone ideal for dramatic single stone designs, or for use as a focal point accented by melee diamonds. The fact that this amethyst is untreated enhances its appeal to buyers who prioritize provenance and natural state, and the Sri Lankan origin adds provenance value because Ceylon has a long established reputation for producing fine quality colored gems.

This amethyst is particularly well suited for custom jewelry, because its size, shape, and cutting style offer both creative flexibility and practical advantages. The oval outline at nearly 19 by 15 millimeters is a classic proportion that adapts to a wide variety of settings, including four and six prong rings, three stone mounts, halo designs, bezel settings, and statement pendants. The mixed brilliant faceting will play exceptionally well when paired with high index accents such as white diamonds or pavé halos, because the contrasting brilliance highlights the vivid purple while offering scintillation from both stone types. For a ring, the gem’s depth supports secure prong engagement, and a slightly raised gallery can be used to display the pavilion facets and enhance light return. For everyday wear, a partial bezel or low four prong setting will protect the girdle and long edges of the oval without sacrificing the open face that displays the vivid color. Designers will appreciate that the stone’s dimensions permit creative orientation options, such as vertical placement for an elongated finger look, or horizontal setting for modern, bar style silhouettes.

When commissioning a custom piece from The Natural Gemstone Company, consider the practical considerations that preserve value and beauty. Because the amethyst is natural and untreated, avoid extreme heat exposure which can alter color, and store the piece away from prolonged direct sunlight to minimize potential fading over many years. Routine cleaning with warm soapy water and a soft brush will keep the polish vibrant, and professional inspections of the setting every year will ensure secure mounting, particularly for a stone of this size. Our gemologists and design consultants are available to advise on optimal metal choices, setting styles, and complementary accent stones to elevate the natural properties of this Ceylon amethyst. In summary, this 15.70 carat, vivid purple, mixed brilliant cut oval amethyst represents an exceptional opportunity for a bespoke creation, combining high grade color, eye level clarity, excellent polish, natural origin, and proportions that lend themselves to elegant, enduring jewelry designs.