Thank you for contacting Mearto with your appraisal inquiry.

It is a very impressive and extensive Iranian/Persian silver set you have sent photos of.

The do not recognise the silver marks but I will take your word for it being silver, and also it looks like silver from the photographs. The quality of silver from Persia is usually quite good so I presume the fineness is somewhere around 900.
It was probably made in the 19th century and must have been in the possession of a wealthy family - the Iranian ambassador as you stated. And it was possibly originally made as a wedding gift.

The estimate provided is for a well-advertised specialised silver auction, where I believe the silver set has the best chance of realising its fullest potential.

Please let me know if you have any additional questions. I’m happy to help.
Thank you