2.49 Ct. Multi Color Boulder Opal (Ironstone Opal) from Australia

This listing presents one beautiful opaque 2.49 carat boulder opal, ironstone opal, in a trillion shape, with exact dimensions 10.33 x 10.64 x 2.99 mm. The gem has been executed in a tablet cutting style, described on the piece as tablet cut, and it exhibits intense color intensity with an excellent polish. There is no enhancement performed on this natural material, and the origin is Australia, a region renowned for high quality boulder opal specimens. The Natural Gemstone Company confirms the weight, measurements, cut style, enhancement status, and origin as part of our standard documentation, and we present this stone with net and accurate specifications for design and appraisal purposes.

From a lapidary and gemological perspective the tablet cut is a shallow, broad facet plan that maximizes the visible opal layer while preserving the ironstone backing for stability. The cut in this trillion form yields a controlled crown plane that emphasizes broad flash and patchwork color patterns rather than faceted brilliance, which is appropriate for Boulder Opal, Ironstone Opal, where play of color is diffraction based. Color grading for this specimen is best described as intense, with dominant greens and blues that shift with angle and light source. The patterning reads as a mix of broad flash areas and infilling nebulous cloud structures that break into smaller pinfire specks at steeper viewing angles, providing dynamic visual complexity. Because the tablet profile maintains a low pavilion and a stable ironstone base, the observed color is saturated and concentrated at the surface, allowing designers to present a vivid face up appearance without sacrificing durability.

Craftsmanship notes address the balance between weight retention and presentation. At 2.49 carat and a thickness of 2.99 mm, the cutter retained a generous face area of 10.33 x 10.64 mm, producing an economical yield while preserving the opal layer and ironstone matrix. The polish quality is excellent, indicating meticulous pre polish and final easel or wheel work to remove micro abrasions and bring out the true luster inherent to opal material. Edge rounding is minimal and precise, which aids setting security in bezel or partial bezel mountings, while the flat tablet back makes the stone well suited for flush set, inlay, or channel style applications where a low profile is desirable. Given the ironstone backing, this boulder opal presents improved toughness relative to thin opal doublets or single crystal opal slabs, but care in mounting and design is still recommended to avoid concentrated impact at the apex corners of the trillion shape.

For the buyer and for designers seeking a premium natural specimen, this stone represents a confluence of technical considerations and aesthetic potential. The combination of trillion geometry and tablet cut produces a strong face up color presence, while the intact ironstone matrix provides mechanical stability and a naturally occurring contrast that enhances green and blue diffraction. The Natural Gemstone Company offers this piece with full disclosure on enhancement, origin, weight, and dimensions, and we can provide guidance on setting recommendations, orientation for optimal play of color, and matching for paired designs. This boulder opal will serve well in bespoke rings, pendants, and designer inlays, and it is suitable for collectors who prioritize original natural material and precise lapidary execution.