January – June 2024 Volume 28 Number 5 - Gemmological Association of Australia

IN THIS ISSUE

January – June 2024 Volume 28 Number 5

ARTICLES

Figure 1. A carving of “lemon ‘n’ lime” chrysoprase from the open cut deposit at Marshall Pool, Western Australia, showing gradation of colour typical of the best material. Size: 60mm x 40mm.

“Lemon ‘n’ Lime” Chrysoprase: A Brief Overview of Chrysoprase from Marshall Pool, Western Australia

This article begins with the origin and colour of chrysoprase, provides a little of its history, then describes the geological sources of the Marshall Pool variety. The chemical, gemmological and mineralogical properties of this chrysoprase are outlined, followed by...

Figure 1. Green tourmaline from Zambia which is highly transparent and mostly free of inclusions. Left: 44.60ct crystal; right: 9.62ct faceted tourmaline which were part of the study sample.

Green Tourmaline from the Hofmeyr Mine, Eastern Zambia

Zambia is recognised internationally as a major producer of copper, cobalt, and emerald from its Copperbelt province. In the east of Zambia, gem-bearing pegmatites contribute to the mineral wealth of the country producing deep blue aquamarine, morganite, tourmaline, and many...

The Sergio: An Exploration of the World’s Largest Carbonado – Part 1

In a recent article on black diamonds in this journal (Hansen and Rennie, 2022), we wrote about “The Sergio” carbonado found in the Bahia province, Brazil in 1895, and named after the field worker who extracted it from the river...

Figure 1. Treble clef brooch measuring 43mm x 17mm. Photo courtesy of the author.

Antique Treble Clef Brooch – a Family Heirloom

During the late nineteenth century Edward Fischer was responsible for most of the gold and silver sporting trophies in Victoria. In 1876 he was commissioned to manufacture the first locally produced Melbourne Cup (Melbourne Cup, 2024) in the Etruscan-style with...