Category: Gem Notes


While the mineral might be well known among collectors, its extreme rarity means few in the public or even gem and jewelry trade know about it.

Montana Sapphire

The latest Gem Note dives into the differences in sapphires sourced in Montana and why it’s so hard to price Rock Creek and Missouri River corundum.


This issue, the tables turn to look at a mineral family prevalent in the industry—it’s available in a wide range of colors and from a wide range of localities.


It’s a common mineral, found on every continent, but faceting rough is rare—unfortunate, since its lighter versions can display dispersion almost twice that of diamond.


Named after Dr. Federico Pezzotta from the Natural History Museum of Milan for his work on Madagascar’s granitic pegmatites, this rare mineral species is relatively new.


There has never been commercial production of this rare member of the sodalite group, celebrated for its striking blue color.


Introduction: Jeremejevite is not well known among the general public and it is safe to say, it is not a common gem seen or familiar within the gem and jewelry industry. Unlike many gems within the…


INTRODUCTION Wulfenite is a mineral species crystallizing in the tetragonal system, lead molybdate, with the formula PbMoO4. It was named after the Austrian mineralogist, Franz Xavier Wulfen. Wulfenite is almost always found as thin, tabular crystals…


Kyanite can be extremely attractive as mineral specimens (Figure 1) and is actively sought after by collectors.