GIA Graders Spot Unusual Inclusions in Natural Diamonds

Graders at the Gemological Institute of America (GIA) recently came across some natural diamonds with interesting inclusions, some of which resembled animal life. 

A round, 1.55-carat, G-color, I-clarity diamond contained heavy feather inclusions that resembled a swarm of butterflies, the GIA reported in its latest issue of Gems & Gemology. The lab observed a feather breaking the pavilion surface face-up through the crown. Mirror and prism images within the diamond created the appearance of a white butterfly. However, since the inclusion was visible through the upper half and bezel facets of the diamond, five prism images were formed, creating a “kaleidoscope” effect, the GIA explained. 

Meanwhile, a round, 0.30-carat, F-color, VS2-clarity diamond submitted for grading housed a small feather in the table with a mirror reflection. That reflection, together with inclusion resembled a “tiny fish swimming under the warm rays of the sun,” the GIA noted. While feathers are common within diamonds, unique and precise shapes such as fish and butterflies are very unusual, the lab said. 

A third diamond also contained remarkable inclusions. The round, 0.90-carat, F-color, VS2-clarity, type Ia diamond had a feather that reached the surface of the table. When viewed through the pavilion, the mirror image caused by the faceting created an effect resembling a “distinctive theater mask,” the GIA noted. 

“This striking inclusion showcases the wide variety of inclusions that are possible in diamonds and leaves a memorable, almost haunting impression,” the lab added.

Images: The mask inclusion, the fish, and the butterflies (clockwise from left). (The Gemological Institute of America)