There is a lot of Fake Lomonosov Porcelain, you can see this on Ebay and other sites. The Chinese have counterfeited some of the patterns. You can see if they are selling a lot of Chinese imports along with Lomonosov its generally counterfeit.
How to get genuine Lomonosov Porcelain
1. The best way is to buy Factory Direct
2. Check the bottom stamp.
3. Ask to see factory contract
Here is what you will see for advertisement:
This is counterfeit
Set of 6 Lomonosov Design Dinner dessert plates 6.5" Beautiful hand painted design enhanced with 22 Karat gold accents under glaze. Recommended hand wash only since made of fine porcelain and gold plated. NOT SAFE FOR MICROWAVE USE.