17.18 Ct. Cabochon Onyx from Madagascar

Presenting a rare and elegant translucent multi color onyx from Madagascar, highlighted by a generous weight of 17.18 carats, and an inviting oval shape that measures 19.49 x 14.44 x 7.29 mm, this gem is a superb example of natural banded onyx offered by The Natural Gemstone Company. Meticulously shaped into a smooth cabochon cut, the surface displays an excellent polish that amplifies the stone body tone and translucency, while enhancing the layered banding that is the hallmark of fine onyx. The color intensity is strong and clear, the bands range from deep black to warm brown and creamy white, and the interplay of those tones creates a dynamic visual flow that changes with every tilt and shift of light. This piece is entirely natural, with no enhancements, and its origin in Madagascar is an assurance of quality and character, reflecting the geological richness of that region. For gem collectors and connoisseurs seeking authenticity and visual depth, this multi color onyx represents a compelling addition.

Under direct and diffused light, the cabochon shows attractive internal reflection and soft glow, which is enhanced by the stone translucency and the tightness of the bands. The bands run parallel in classic onyx fashion, creating clean stripes that alternate from inky black to honeyed brown and a crisp white band that provides contrast and focal interest. The smooth domed surface of the cabochon minimizes light leakage, concentrating the color bands for a richer visual effect, while the excellent polish yields a glassy luster that is pleasing to the touch. At 19.49 x 14.44 x 7.29 mm the gem sits comfortably as a statement focal, yet remains versatile enough for a variety of jewelry designs. Natural inclusions and growth features are subtly visible under magnification, adding character and confirming the natural origin, they do not detract from the overall aesthetic, rather they authenticate the gem as a unique piece of nature.

This multi color onyx is ideal for a broad range of settings and design concepts, it will create an impressive center for a classic signet or statement ring, a bold pendant that showcases the bands vertically, or a refined cabochon set in a bespoke cufflink or brooch. Designers will appreciate the balance between size and visual impact, the cabochon profile complements both modern minimal settings and more ornate vintage inspired designs, and the stone will pair beautifully with yellow gold for warmth or with sterling and oxidized metals for dramatic contrast. Because the stone is unenhanced it offers enduring color and natural stability, gentle daily wear is suitable, avoid harsh chemicals and extended exposure to extreme heat, cleaning with warm soapy water and a soft cloth will preserve the polish and luster. For settings that require drilling or bezel work, consult a trusted jeweler experienced with cabochon onyx to ensure secure mounting that respects the gem proportions.

At The Natural Gemstone Company we stand behind the provenance and quality of every gem we offer, this Madagascar multi color onyx has been selected for its intense color, excellent polish, and attractive banding, it is an excellent choice for collectors and designers who value natural character and artisanal potential. We can provide detailed high resolution imagery and measurements upon request, and our team is available to advise on mounting options, complementary gemstones, and secure shipping. Whether you are adding to a curated collection or commissioning a one of a kind piece, this translucent 17.18 carat oval cabochon presents a rare opportunity to own a striking natural onyx with clear, bold banding and timeless appeal. Contact us at The Natural Gemstone Company to discuss availability and to request additional information, we look forward to helping you bring this exceptional gem into your design or collection.