4.20 Ct. Boulder Opal from Australia

Opal has long been celebrated as a gemstone that carries the memory of the earth and the sky, a jewel whose shimmering presence has inspired myths and admiration across centuries, and this is especially true of the Australian Boulder Opal. Mined from ancient ironstone seams, Boulder Opal preserves the very matrix that cradled it for millennia, and each piece reads like a small chapter of geological history, layered and patient. This particular stone from The Natural Gemstone Company weighs 4.20 carat, and it is fashioned into an elegant oval shape, with dimensions of 15.94 x 7.14 x 4.67 mm. The tablet cut chosen for this gem accentuates its broad, luminous surface, allowing the opal to present an uninterrupted field of color that seems to shift as light and angle change. The gem is opaque, a characteristic often prized in Boulder Opal because it intensifies the play of color against the dark ironstone backing, and its profile reveals the natural relationship between the precious opal and the host rock, a relationship that has been honored rather than erased by cutting and polishing.

Viewed closely, the multi color opal displays an intense color intensity that speaks to both the quality of the material and the skill of the cutter, and the excellent polish gives each flash and patch of color a depth that invites prolonged appreciation. This stone presents vivid blues and greens that move across the surface, suggesting oceanic depths and northern lights in miniature, while darker tones and subtle patterning create contrast and personality. The tablet cut presents a broad canvas, making this opal ideal for settings where the face of the gem is meant to be admired without distraction. Importantly, there has been no enhancement applied to this gem, so the rich colors are wholly natural, a direct expression of the stone itself and the landscape from which it came. Boulder Opal, with its natural ironstone edge, offers a unique design language, providing both visual contrast and a practical mounting surface, which makes it suitable for a variety of jewelry types, from an intimate pendant to a statement ring or a finely crafted brooch.

A gem of this character is best thought of as an heirloom in waiting, a classic object that will carry its story through generations, and The Natural Gemstone Company is proud to present it with provenance and care. For designers and collectors who value tradition and legacy, the opal’s history and its enduring beauty make it an ideal centerpiece, whether set in warm yellow gold to enhance its vivacity, in cool white metal to emphasize the blues, or in a custom setting that preserves the ironstone edge for a rustic, authentic feel. To preserve its brightness, it is best to avoid harsh chemicals and sudden temperature changes, and to clean it gently with a soft cloth and mild water, because its natural structure responds to careful stewardship rather than aggressive treatment. If you seek a gem that embodies the intersection of ancient earth processes and timeless design, this 4.20 carat oval Boulder Opal, with its dimensions of 15.94 x 7.14 x 4.67 mm, tablet cut, intense color intensity, excellent polish, no enhancement, and Australian origin, offers a rare and authentic expression. Contact The Natural Gemstone Company for further information, to discuss bespoke settings, or to request detailed images and certification, and allow this stone to become a part of your legacy, a living piece of natural history that will delight for years to come.