Although called "black diamonds," carbonados are a polycrystalline material. Learn how they may have originated in ancient supernova explosions.
There is a new piece of software available that will be of interest to many of you. It is called the Diamond Calculator. More information available here!
Gemologists are seeing more and more HPHT diamonds. While detection equipment is costly, you can assess the likelihood of treatment without it.
Visit one of the top gem hunting spots in the US. Go alone or with the family. A gemology-themed vacation can be fun, educational, and (maybe) profitable.
This is an explanation of the GIA's Diamond Cut Grading System complete with clear photographs demonstrating each of the grades.
Everything you need to know about diamonds from someone who isn't trying to sell you a diamond. Advise on how to choose a diamond and evaluate the 4Cs.