Hi I just returned from holiday in Beijing and visited this place which is opened only one third of the year according to the tour guide, we were advised not to buy pixiu and placed it without knowledge. Accordingly this place is operated by the Chinese govt and the staffs or the in charge graduated with architectural degree and fs is a must I think. According to her, there are different size and colours which must be match to the buyer. A mismatch in size or colour would render it useless for the buyer. Hope it helps. Btw pixiu must be made of jade.