1.75 Ct. Purple Amethyst from Brazil

One transparent, oval shape, purple amethyst weighing 1.75 carat, with dimensions 9.13 by 7.29 by 4.45 mm, presents a refined and balanced profile suitable for a variety of jewelry applications. The gem is fashioned with a mixed brilliant cut, combining a faceted crown schema that enhances scintillation with a pavilion engineered for optimal return of light. Clarity is graded as included, evaluated at eye level, and the stone displays internal characteristics that are inherent to natural amethyst, adding natural character while remaining visually attractive. Color intensity is classified as intense, yielding a rich, saturated violet hue that remains uniform across the table in standard lighting. The polish is excellent, producing crisp facet junctions and smooth planes that support strong surface reflection. No enhancement has been applied to this specimen, and its origin is Brazil, a well established source known for producing consistently high quality amethyst material. The Natural Gemstone Company confirms these attributes as integral aspects of the stone, and they are presented here to assist in accurate assessment and design planning.

When evaluated in terms of brilliance and light performance, this amethyst displays optical behavior distinct from more commonly encountered gem species such as diamond, sapphire, or topaz. Amethyst, a variety of quartz, has a refractive index in the approximate range of 1.544 to 1.553 and a dispersion value near 0.013. By comparison, diamond has a refractive index of 2.42 and dispersion near 0.044, while corundum varieties such as sapphire have refractive indices around 1.76 and slightly higher dispersion than quartz. Those differences mean that amethyst will not exhibit the same level of fire and high refractive brilliance as diamond, nor the same degree of luster as sapphire. However, the perceived brilliance of this amethyst is augmented by several factors that allow it to stand out. The mixed brilliant cutting style concentrates small, well proportioned facets across the crown and pavilion, increasing scintillation and contrast as the gem moves. The intense purple coloration provides strong color saturation that contributes to visual depth, producing a lively interplay between internal color and surface reflection. In gems where color is the primary appeal, such as amethyst, the richness and uniformity of hue often create a more compelling visual presence than sheer fire alone. The excellent polish further amplifies surface brightness, and despite the included clarity grade, the internal features do not significantly interrupt light return in most viewing conditions, allowing the stone to present a vivid and lively appearance that is easily appreciated in hand.

From a practical perspective, the dimensions and cutting style of this 1.75 carat oval amethyst make it well suited to a center stone role in rings, pendants, or bespoke pieces that emphasize color. The 4.45 mm depth indicates proportions that balance face up spread with a sense of depth, presenting the intense color while avoiding a visually shallow profile. Because no enhancement has been applied and the origin is Brazil, the stone carries the natural characteristics and stability associated with untreated material, although like all natural gemstones it benefits from considered care. Prolonged exposure to strong sunlight or excessive heat can affect color, and aggressive chemical cleaners should be avoided to preserve the surface finish and integrity of the setting. Routine cleaning with mild soap and warm water, followed by gentle drying with a soft cloth, will maintain its visual appeal, and careful setting design can protect the pavilion and girdle from mechanical impact. When compared to more highly refractive gems, this amethyst excels through its saturated color, thoughtful cutting, and excellent polish, qualities that create a distinct and confident presence in finished jewelry. The Natural Gemstone Company provides this detailed description to support informed selection and to ensure accurate expectations for optical performance, origin, and treatment status.