A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.
Read More
A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.
Read More
The authors used Vis-NIR spectral measurements combined with LA-ICP-MS data to investigate the usefulness of absorption spectra.
Read More
The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds coloured grey to blue to violet.
Read More
Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.
Read MoreUsing a multi-step process, Lucent Diamonds has developed a new treatment process for certain natural diamonds that creates colours from pink-purple to red to orangey brown.
Read More
This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.
Read MoreExamination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.
Read MoreThe author has uncovered many ancient references to the simulation or enhancement of gemstones.
Read MoreAn overview of the potential effects that heat treatment can have on corundum.
Read More
