One of the processes in pearl oyster cultivation is detecting the pearl nucleus to gain
information whether the pearl nucleus is still attached in the shell or vomited. The common …

A pearl's distinguished beauty and toughness are attributable to the periodic stacking of
aragonite tablets known as nacre. Nacre has naturally occurring mesoscale periodicity that …

The pearl is known as the queen of jewels, and has been used for adornment and as a
symbol of material wealth throughout human history. Pearls are formed by the secretion of …

The science of gemology has its roots in two main functions: observation and interpreta tion
of those observations. With this approach, gemologists have developed quite effective ways …

This article reviews the extraction of DNA (deoxyribonucleic acid) from biogenic gem
materials (pearls, corals and ivory) for determining species identification and …

We report the first successful extraction of oyster DNA from a pearl and use it to identify the
source oyster species for the three major pearl-producing oyster species Pinctada …

Nacre thickness is a major factor influencing the quality and value of half-pearls ('mabé'), yet
accurate determination of nacre thickness, in a non-destructive manner, is problematic …

GemTOF, installed at the Swiss Gemmological Institute SSEF, is a next-generation chemical
analysis technique for gemmology: laser ablation inductively coupled plasma time-of-flight …

NOTES AND NEW TECHNIQUES GEMS & GEMOLOGY SUMMER 2010 123 the length of
one pixel, or expressed as a volume element (voxel, a 3D pixel). To be resolved, features …

Digital radiography and computed tomography are two fundamental diagnostic techniques
in different fields of research, including cultural heritage studies and gemmology. The …