"hsin yi co., ltd." who is one fo the leading for manufacture, wholesaler and exporter of cubic zirconia (a & aaa quality), synthetic stones, glass stones for hand cut, european machine cut “hearts & arrows” (hsin yi star & ouma quality) and also korean machine cut. our office and factory are based in thailand, more important is that we have experience more than 27 years in producing cubic zirconia and are able to fit your request. currently our product which named "ouma" is popular in the market, perhaps you already know it. it is cut by european machine with the " 8 arrows & 8 hearts " effect. this effect also treated as the trademark of this outstanding product. the effect of "8 arrows & 8 hearts " reveals how precise was each facet being cut and polished in the other words, reached the maximum brilliance level with the minimum tolerance. (+/-0.01mm). it is sold in fully vacuumised packing with name “ouma” on it that gives a guarantee to customers about the perfection of its quality products. attaching is our packing. thus, "ouma" is best suitable for high quality silver and gold jewellery production with wax setting process because of its nature of no breakage, perfect girdle, constant size, heat resistance, and no color change quality which results in high quality jewellery production. for more details, you can visit our website: www.hsinyigems.com .