Thailand has more than its share of jewels, and many of them will be on display in January at the Fifth Bangkok International Jewellery Fair, along with gems from Hong Kong, Germany, Japan and elsewhere. The Thai Government said 200 exhibitors from 10 countries will participate in the show, but 70 per cent of the dealers will be from Thailand. The fair is scheduled for January 8 to 11 at the Queen Sirikit National Convention Centre in Bangkok. Displays will include a range of silver, gold, gemset jewellery, gemstones and accessories. Opal House, one of Hong Kong's largest opal dealers, would have a booth at the fair, said the company's executive director, Ann Cheng. ''Through the Bangkok Fair, we can contact many Japanese and Europeans,'' Ms Cheng said. ''The fair gives us good potential to reach the markets we target.'' Opal House specialises in middle-of-the-range products, although its prices reach higher levels for the more exclusive products. Ms Cheng said she hoped to launch a new line at the Bangkok Fair. The new products were still being developed, she said. Soontorn Pornprakit, president of the Jewellers' Association, said: ''The Bangkok International Jewellery Fair will provide the Thai jewellery traders with a perfect opportunity to showcase their quality products to buyers from all over the world. ''I believe that an international trade fair like this jewellery show can serve as an efficient promotional channel for our jewellery industry,'' he said. Among the Thai companies attending the fair will be Rose Factory, which manufactures 18-carat gold jewellery. The jewellery was popular with Europeans, the company said. Rose Factory produces about 12,000 pieces per month. Many other Thai companies will bring rough and cut stones, for which Thailand is famous. There will be a cornucopia of rubies and sapphires, although semi-precious stones will also be displayed. Because of its low manufacturing costs, Thailand produces much of its own jewellery which will be brought to the fair by companies such as J. Gems, Sri Suwan Jewellery Co. Ltd and Ferre Jewellery Creation. Loose stones will be exhibited by Emerald Mines Co. Ltd, C. S. Gems Centre Ltd, Star Lanka ROP and others. This year, more of the companies attending the fair manufacture or export silver jewellery, including Dang Fashion Accessories Co. Ltd, whose hand-crafted silver with semi-precious stones is popular among teenagers throughout the world. ''Our jewellery is affordable for teenagers,'' said Miss Wanpen, the company's export manager. ''Since the world economy is not so healthy, we must maintain our quality but decrease the cost,'' she said. Also popular is the marcasite and silver jewellery of J. R. Jewellery Co. Ltd., Thailand.