Description

Gemstone Specifications
​Gemstone Type: Natural Opal
​Weight: 4.89 carats (ct)
​Shape & Cut: Oval Cabochon cut (a smooth, rounded top without facets)
​Colour: Play of color (the shifting iridescent colors characteristic of opals)
​Measurements: Approximately 16.30*12.30*3.60{ mm}
​Refractive Index (R.I.): 1.44 – 1.46
​Specific Gravity (S.G.): 1.98 – 2.20

​Certificate Details
​Laboratory: Cambay Gemmological Lab (CGL), Mumbai.
​Certificate Number: cglm113318
​Certification: The document notes it is an ISO 9001:2015 certified lab.
​Important Disclaimer: A note at the bottom states: “Origin & enhancement not checked for the above specimen.” This means the lab has confirmed the stone is a natural opal, but they did not verify where it was mined or if it has undergone treatments (like smoking or dyeing) to enhance its appearance.
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Visual Elements
​The Stone: A small, oval-shaped opal is visible in the top-right compartment of the case. It shows flashes of green and blue light.
​Security Features: There is a QR code on the right side and an official seal from “Cambay Gemmological Lab, Mumbai.”
​Note: When buying or evaluating gemstones, the “Play of Color” and the thickness of the stone (the 3.60 mm depth) are key factors in determining its value and how it might be set into jewelry.