Article Search Results

Show Filters
Showing 3 results for "*"
Grayish blue aquamarine
Aquamarine with Unusually Strong Dichroism

This aquamarine's most striking feature was its unusually strong dichroism, displaying very deep blue and pale bluish green colors.

Read More

Giant Clam Pearl
A Large Baroque Tridacna Gigas (Giant Clam) Pearl

This giant clam pearl was noteworthy for its size and interesting coloration, and its pronounced banding when viewed with transmitted light.

Read More

Water Immersion Reveals Dye in Fire Opal

A simple test easily detected dye treatment in fire opal.

Read More