3.25 Ct. Boulder Opal from Australia

One beautiful opaque 3.25 carat trillion shape multi color opal, from Australia, is offered by The Natural Gemstone Company. This stone measures 12.43 x 11.04 x 3.28 mm and features a tablet cut that presents a broad, flat face and brilliant play of color. The specimen is an authentic Boulder Opal, showing the characteristic integration of precious opal material with ironstone matrix, and it carries no enhancements or treatments. The color intensity is classified as intense, and the finish is an excellent polish that brings out vibrant flashes of green, blue, and occasional red and orange against a rich brown host. The trillion silhouette and sailor friendly proportions make this a versatile gem for custom work, and the precise dimensions and 3.25 carat weight ensure confident planning for setting and design.

Visually this Boulder Opal offers a dramatic, multi color display that moves with the light, revealing mosaics of electric green and peacock blue, with spots and veins of warm fire tones that create alluring contrast with the darker ironstone backdrop. The tablet cut emphasizes the color surface by maximizing the optical area, and the triangular geometry reads clean and modern while retaining organic character from the natural matrix. The polish is so crisp that individual color patches appear to float above the stone, and the intense play of color remains lively from many viewing angles and at lower light intensities. As an opaque opal, the depth is intimate and the color is concentrated, making it ideal for a statement ring, a centerpiece pendant, or a bold pair of asymmetrical earrings where stability and presence are desired.

As a Boulder Opal sourced in Australia, this gem carries a story of formation within sedimentary ironstone seams, where precious silica settled into crevices and hardened into the vivid color bars you now see. The retained ironstone matrix gives Boulder Opals a natural backing that enhances durability compared with softer, free form opal varieties, and because this opal is offered untreated, collectors and jewelry makers receive the authentic character and value of a natural stone. Care is straightforward, treat this opal as a precious but hardy material, avoid sudden temperature shocks, long exposure to harsh chemicals, and ultrasonic cleaners, and store it separately on a soft surface to prevent abrasion. With its 3.25 carat weight and compact yet substantial dimensions, it fits comfortably into many standard setting designs while allowing jewelers room to showcase the play of color with minimal surrounding metal.

At The Natural Gemstone Company we select, photograph, and describe each gem to help you create lasting expressions of beauty, and this Australian Boulder Opal is a fine example of the kind of natural, untreated material we stand behind. We offer professional guidance on setting style, metal choice, and mounting techniques to accentuate the stone without compromising its natural matrix, and we can assist with custom design, matching companion stones, or creating a one of a kind piece that highlights the trillion shape and tablet cut. Secure packaging, insured shipping, and transparent provenance accompany every purchase, and we invite you to contact us for additional photos, measurements, or to arrange a private viewing. This opal is ready to be transformed into a meaningful jewel, and our team at The Natural Gemstone Company is available to answer questions, provide recommendations, and facilitate a confident purchase.