Hettiarachchi, L2023-09-212023-09-211984-05-28**http://dl.lib.uom.lk/handle/123/21455Gem Industry cannot be studied in isolation. It has to be studied along with the Diamond Industry in particular and Jewellery industry. With the Jewellery Indus-. try coming into the scene, and with precious metals involved, it gets connected with the supply and demand of money. This is particularly so as diamonds, gems and gold have sometimes been considered as items comprising investment portfolios throughout the world. Supply and demand of diamonds, gems and gold therefore over the years reveal interesting areas of study. Technological development, scientific advancements and changes in consumer, tastes have always played their part in the gem industry too. An attempt has been made, therefore - in this paper to show as far as possible the different interactions in these areas. It is very appropriate to discuss at this stage, the presentenConference-Full-textEngineeringDepartment of Mining and Mineral Engineering1984Symposium on mineral resources of sri lanka and its developmentsUniversity of Moratuwa, Katubedda, Moratuwa.pp. 25-31Proceedings of the symposium on mineral resources of Sri Lanka and its developments