Consider acquiring the necessary knowledge yourself. Identifying antiques made in China is not that difficult. Obtain books, CDs, etc., and use every opportunity to inspect relevant pieces of porcelain closely. This will give you the foundation to verify or authenticate antique porcelain to some degree on your own. (If you happen to read Chinese, you can purchase books in Chinese language at very reasonable prices on this type of subject online, directly from China.)
What is required for deciding the age and authenticity of porcelain?
Key is knowing unique qualities and features of shape, color, etc. of each period.
In each period the decoration was somewhat different, unique.
Then there are age signs and production (quality) flaws that differ depending on the period and kiln an item was made in.
CDs with sample item pictures, shards for identifying the decoration, and visiting porcelain collections in museums will all help to deepen your knowledge and experience. If you are in a location where you do not have ready access to museums with a ceramics department, you can view fakes and some genuine items online. Check out the website mentioned below. This collector's private collection is the real stuff! With time, as you become more and more experienced you will begin to recognize some of the features genuine, antique porcelain invariably has. AYou will be able also detect the telltale signs of fakes and reproductions.
Learning about Chinese porcelain is an ongoing process. And, the more you learn the less you seem to know. There is really no quick method to getting to know antique Chinese porcelain!
Reference books, samples, etc. may show you the essentials, but you still need to accumulate the experience yourself. Only then can you authenticate Chinese porcelain reliably. If you know someone with special knowledge in this area, use their help. Having someone pointing out problems can only help and speed up progress!