Collector’s Piece: Natural Glass var. Obsidian from Caldas, Columbia

Collector’s Piece: Natural Glass var. Obsidian from Caldas, Columbia

Dimension: 10.5cm x 9.7cm x 7cm

Weight: 668g

Locality: Department of Caldas, Columbia


A lab CERTIFIED, Natural Glass var. Obsidian in a rare intense aqua blue color mined in the volcanic district of the Department of Caldas in Columbia. This beautiful large cabinet Obsidian has seeming natural conchoidal fracture and vitreous luster. It is completely transparent, exceedingly lustrous and way more beautiful in person! Comes with a high quality acrylic display stand and a certificate of authenticity as pictured.


I’d been lucky to have acquired one lot of these gorgeous natural glasses back in 2019, it came in different colors and transparency but only a few display striking and vivid aqua blue color like this piece. Every single piece has been sent to the mineral testing center of the PR China Land & Resources Ministry to certify for its authenticity so they are guaranteed to be 100% natural.


Obsidian is formed by rapid cooling of viscous lava from volcanoes. These amorphous volcanic glasses are usually black to grey-black in colors. It also occurs as red, brown-green, green, yellow, orange, and rare transparent colorless. The transparency is commonly opaque but some are found completely transparent. Air bubbles are sometimes imparted in the course of magma flow.