AI Appraisal Estimate

This is a high-quality loose gemstone identifying as a Crystal Australian Opal, weighing approximately 0.5 grams and measuring 1 inch by 1 inch. The stone is cut in a classic oval cabochon shape with a high dome, showcasing a translucent to semi-transparent body tone characteristic of 'Crystal' variety opals. Under light, it displays a vibrant 'play-of-color' including brilliant flashes of neon green, electric blue, orange, and hints of violet scattered across the surface in a charming pinfire and small-floral pattern. The craftsmanship is evident in the smooth, symmetrical polish of its surface. According to the provided provenance, this specimen is 58 years old, placing its origin in the mid-1960s, a period known for high-quality yields from Australian mines like Coober Pedy or Andamooka. The condition is described as perfect, showing no visible signs of crazing, fractures, or surface abrasions. The clarity and intensity of the spectral colors against the clear base indicate a premium specimen suitable for high-end jewelry settings or investment-grade mineral collections.

Based on the provided description and details, I have assessed this Oval Cabochon Crystal Australian Opal. The specimen weighs approximately 0.5 grams (about 2.5 carats) and measures 1 inch by 1 inch. The 'Crystal' variety is highly sought after for its translucent to semi-transparent body tone, which allows for exceptional light penetration and vibrant 'play-of-color'. The reported neon green, electric blue, orange, and violet flashes in a pinfire and small-floral pattern indicate a high-quality gem. The mid-1960s Australian origin (likely Coober Pedy or Andamooka) adds desirable provenance. The condition is noted as perfect, with no crazing, fractures, or abrasions, which is crucial for opal valuation. At approximately 2.5 carats, a high-quality crystal opal with strong play-of-color currently commands between $200 to $400+ per carat in the retail market, depending on the brightness and pattern. Given the described perfection and vibrant colors, I estimate the fair market value to be around $800. However, please note that this appraisal is based solely on the provided text. Authenticating Australian origin, confirming the absence of treatments (like doublets or triplets), and accurately assessing the brightness and pattern of the play-of-color require physical, in-person examination by a qualified gemologist using specialized equipment.