O.S. Sina is a brand name of mineral crystal founded by Orient Star Jewelry Company in Taiwan, and Ke-Tang of Guang-Dong province China in 2004. Given the parent company's years of experiences on running private mining-sites in various gemstone and mineral deposits around the world like South America and Africa, it is possible to offer a wide selection of rough stones in gemstone and crystal to our partners in the industry for their convenience in the procurement process and further improves trading relations with rough stone buyers from the Mainland as well as South Eastern Asia, meanwhile it is able to accelerate the development of jewelry industry of Taiwan and China.

Brand Positioning：
　　Orient、 Star and Sina together translate to a galaxy consists of star with the eternal energy of natural minerals derived from thousands of years of Eastern culture. The endless expressions seen in minerals are captured in the gemstones that occupy a corner of the star-filled galaxy in our mind. Such depiction also reflects the spirit of O.S. Sina which is: No boundary and no limit on how far we will go to satisfy our customers, and we aim to have a constant presence in the mind of customers of all places.

Brand Positioning： Profound Energy, Eternal Classic

　　The town of Ke-Tang is located in Hai-Feng County of south eastern Guang-Dong province, about 290 kilometers from the city of Guang-Zhou, 197 kilometers from Shen-Zhen and 180 kilometers from Shan-Tou. The town is only 1.5 to 2.5 hours away by direct bus service from the airports and train stations of the 3 major metropolitan areas, hence easy access by various means of transportation. The town's jurisdiction is under Shan-Wei city of Hai-Feng County, it is situated in the center of Shan-Wei city, Lu-Feng city and Hai-Feng County with an average of 10 kilometers to any of the there surrounding places.

Ke-Tang in conjunction with adjacent vicinities boasts a total of more than 1,000 wholesalers and processing factories of rough stones in various scales. The total annual capacity of semi-precious gemstones processed exceeds 50,000 tons; the town has become the perennial semi-precious processing center of China and it is also known as the capital for processing crystal accessories around the world. There is practically a processing facility for any type of gemstone available in the global market, for example, there are more than 50 different specimens of natural crystal and not to mention the countless types of quartz and jade that are available. Today, Ke-Tang's production crystal accessories accounts for 71% of world’s total capacity, and they are mostly exported to United States, Italy, Australia, Russia, India and Middle East. Furthermore, the town is home to a state-of-the-art jewelry market for the trading of rough stones of semi-precious stones like crystal, tourmaline and emerald; it is a place for exhibiting finished products as well, and the selections available is simply breathtaking. The market is located at the intersection of National Route 324 (Guang-Shan Expressway) and Ke-Shan Expressway (from Ke-Tang town to Shan-Wei city), and occupies a total space of 30,000 square meters.