ABSTRACT
Alluvial diamonds are found on the island of Borneo, Indonesia.The deposits are found around the Landak River in western Kalimantan, in Linhaisai minette in the headwaters of the Barito River in central Kalimantan, and also in the Banjarmasin-Martapura area of southeastern Kalimantan where rivers drain from the Meratus Mountains into the Danau Seran Swamp. Mining activities date back to 600 A.D. and fine diamonds with fancy colours such as blue, pink and canary-yellow have been reported. The authors visited the mines in the Banjarmasin-Martapura area early March 2002 to study mining and trading activities. They purchased 14 specimens of diamond for further study. This paper provides a general outline and description of the diamond morphology and surface features of southeastern Kalimantan diamond. Some spectroscopic features of these diamonds were studied and recorded.

PEARL RESOURCES OF CHINA

Zhang Hui, Zhang Beili
National Gems and Jewelry Information Center, Beijing, China

ABSTRACT
An abundant pearl resource exists in China, together with a long history of harvesting natural pearls and the utilization of pearl cultivation in areas of China such as seawater pearl cultivation localities in Guangdong, Guangxi and Hainan provinces and fresh-water pearl cultivation localities in Zhejiang and Jiangsu provinces. The Zhuji pearl market in Zhejiang, and the Weitang pearl market in Jiangsu, also play key roles in the global marketing of Chinese freshwater cultured pearls.

China has a huge production of cultured pearls, but their market values are relatively low Opportunities and challenges co-exist in the Chinese pearl industry. Taking maximum advantage of China's pearl resources, adjusting the industrial structure of the industry, and further exploitation of both domestic and international markets are inevitable choices for the healthy long-term development of Chinese cultured pearl industry.

PROFESSIONAL GEM LIGHT 2
An advanced laboratory hand lens lighting system

ABSTRACT
Lighting for hand lens use has been neglected by manufacturers owing to a limited market and a lack of defining parameters for such a specific piece of equipment. Users of the hand lens for gemological examination tend to use any basic system of illumination, as the hand lens is generally considered to be a simple instrument that is used only when microscopy is unavailable. In fact the microscope has more visual limitations than a quality hand lens that uses a sophisticated lighting system.

RUBELLITE FROM MOMEIK TOWNSHIP MYANMAR

Prof U Tin Hlaing¹, Aung Khaing Win²
1 Geology Department, Pinlong University, Myanmar
2 Geology Department, Yangon University, Myanmar

ABSTRACT
Colourful tourmalines, occurring either as euhedral single crystals, or mushroom shaped aggregates and hotryoidal masses, occur in pegmatites that intrude peridotite near Molo village in Myamnar's Shan State. Minerals associated with these unusual tourmalines include quartz, orthoclase feldspar, beryl, petalite and hambergite. In this paper the location, geological occurrence, and properties of these tourmalines and their associated minerals will he described.