The Diamond Certification Laboratory of Australia (DCLA) has warned of a coated pink diamond being submitted to the lab for certification and color authentication.
After routine examination of the 0.70 carat stone, the DCLA discovered that when the diamond is viewed under high magnification with reflected diffused light, a patchy iridescent coating is visible on the surface.
"This coating is also easily visible on the pavilion facets of the stone when viewed through the table. However, when the diamond is observed under magnification with regular diffused light, the pink coloration appears evenly distributed, particularly when viewed face up," explains a spokesman for the DCLA, which says it has seen a number of treated stones of late. The DCLA, which will not issue a diamond certificate for treated or synthetic diamonds, notes that it is of particular concern when such treated diamonds are accompanied by seemingly legitimate reports or paperwork.