Summarizes the features of 480 nm band diamonds, including chameleon diamonds and those with unmodified orange hues, for rapid identification or advanced gemological testing.

A euhedral prismatic pargasite crystal is identified in pink spinel.

Play-of-color pattern in Ethiopian opal is reminiscent of a turtle’s shell.

A non-nacreous pearl with a netted surface resembles the exterior of a melon.

A diamond feather and its reflection resemble an unidentified flying object.

Examination of a 1.34 ct ruby reveals a unique inclusion formed during heat treatment.

A diamond octahedron from South Africa hosts a rare yellow-orange almandine-pyrope garnet crystal.

Examines correlations between surface microstructures and the orange peel effect in Russian white nephrite, proposing a formation model and revealing distinctive microfeatures specific to the material.

Investigates the morphological changes of macle diamonds during the growth process by exploring their three-dimensional internal zonal structure.

A 37.41 ct natural rough diamond with distinct pink and colorless zones is examined at GIA’s Botswana laboratory.

Organic-rich material is observed through an opening in a hollow natural pearl.

Gersdorffite inclusions in quartz exhibit either triangular or hexagonal shapes when viewed from different directions.