1.45 Ct. Boulder Opal from Australia

This specimen is a 1.45 carat, oval shaped, opaque Boulder Opal, measuring 9.58 x 6.01 x 3.17 mm, presented in a tablet cut with a distinctly low profile and broad table. The tablet cut used here favors a flattened plane rather than a high dome, permitting an expansive play of color across the surface and maximizing the perception of color intensity at shallow viewing angles. The piece exhibits vivid color intensity, predominantly electric greens and deep ocean blues, with multi color patches that shift with movement due to diffraction from the silica sphere structure inherent to opal. The stone retains a natural ironstone backing characteristic of Australian Boulder Opal, visible as a narrow brown rim along the girdle, which provides structural support and aids in stable mounting. The polish is excellent, producing clean light return across the tablet with minimal surface grain, and there are no indications of enhancements, impregnation, or filling. Origin is Australia, and the cutting choices reflect preservation of color bar continuity and optimum thickness for both durability and color saturation.

From a lapidary and setting perspective the cutter prioritized color orientation and edge retention, trimming to a controlled oval outline that preserves broad color patches while maintaining a thin, even thickness of 3.17 mm suitable for inlay and low profile settings. The absence of faceting means finish quality is dependent on even abrasion and sequential polishing stages, and this piece demonstrates meticulous lapidary technique in its uniform reflectivity and smooth transition from face to edge. For jewelry application the tablet cut and ironstone backing recommend a low bezel, flush inlay, or custom seated pendant to protect the thin profile, with designers often preferring settings that expose the table for maximum play of color while securing the ironstone margin. Care instructions include avoiding ultrasonic cleaners and thermal shock, and using gentle cleaning with mild, non alkaline soap and a soft cloth. The Natural Gemstone Company presents this Boulder Opal as a natural, untreated specimen ideal for collectors and designers who value technical craftsmanship, stable structure, vivid color, and authentic Australian provenance.