Up for sale is a highly exceptional, 100% natural Star Ruby from Thailand, weighing 5.2 carats. This collector's piece features a beautiful, full oval cabochon cut (8.7 x 8.4 x 5.8 mm). The unique characteristic of this gemstone is its mystical optical phenomenon: under a direct light source (such as sunlight or a flashlight), a stunning 6-ray star (asterism) comes alive on its surface. A true rarity and a magnificent choice for a high-end collector or as the centerpiece of a bespoke, custom-made ring or pendant. Gemstone Technical SpecificationsParameterDescriptionDimensions8.7 x 8.4 x 5.8 mm (Length x Width x Depth)ClaritySemi-translucent (Félig áttetsző). Contains natural, microscopic rutile needle inclusions ("silk") required to produce the star effect, giving the stone a rich, mystical depth.Colour detailsDeep purplish-red / pinkish-red (classic Thailand ruby hue) with a prominent, well-defined 6-ray asterism (optical star effect) that moves gracefully across the surface under a direct light source.LustreVitreous to silky, beautifully enhanced by the smooth, high-dome oval cabochon finish.Condition descriptionExcellent condition. Brand new and never set. No scratches, cracks, or visible chips. The surface is perfectly polished with no signs of wear.TreatmentsNo evidence of treatment (100% Natural, Unheated). Free from any glass-filling, flux, or diffusion enhancements. Natural certificate is included as proof.