C14 dating diamonds
A variety of shapes are possible, including thin rods and irregular shapes, and some are associated with feathers.These metallic inclusions can create a magnetic attraction. While synthetic diamonds grown by the high-pressure, high-temperature (HPHT) method have been commercially available since the mid-1990s, the technology has made great strides in the last decade.The ruby weighs 8.92 ct and measures 13.2 × 11.0 mm; the sapphire at the bottom left weighs 3.67 ct and measures 9.1 mm in diameter. The company sold these goods through the late 1970s, though the samples from the 1960s and beyond differ slightly from their earlier counterparts.Karl Schmetzer and his coauthors explore the variant of the Verneuil process that Wiede’s used to grow these synthetics.In the issue’s lead article, GIA’s Sally Eaton-Magaña, James E. Breeding provide insight into the HPHT-grown material available on the market, including statistical data about the cut, color, and clarities available as well as identification criteria for gemologists.These natural pearls, reportedly from the pre- to early Columbian era, represent some of the 85 samples examined in the study.
Our lead article surveys the HPHT-grown diamonds seen in GIA labs since 2007.Since my background is biological, I thought that discipline would be the obvious place to start—in particular, something about microbes doing interesting things under the surface of the Earth. It was one of the first posters in the aisle, so prominent to the casual passerby: Dinosaur bones and diamonds!My brain, attracted to both old and shiny objects, sent me in closer to investigate.Oyster beds in the Caribbean were heavily exploited during the first half of the sixteenth century before oysters became scarce.A supplier came into possession of 85 pearls, reportedly from Central or South America and dating from the pre- or early Columbian era.