Both the young ladies seem to have rings on their right hand (unless the image has been reversed). Could that indicate a common event/ceremony they have both experienced? Could they both be engaged? If so, the dates of their weddings might help date the photo. They are also both seem to be wearing lockets.
The seated lady's hands are not clear, although you might be able to see a wedding ring. I like her cameo brooch.
The gentleman has an interesting pin in his button hole, and the ubiquitous watch chain. He seems to wear no rings though, except for a rather large one on the little finger of the left hand (a signet ring?). He also might be getting a bit portly, considering he has unbuttoned his bottom waistcoat button inorder to sit down!!
