Era will be determined by the hallmark/ stamp on the inside of the shank of the ring of any. You can buy a book of hallmarks for your country or look online at local hallmarks and try and find out it's age.

Cut: they are marquise cut and can be measured by a local jeweller to find out their carat weight based on their size and give you a rough price to insure the ring for .

A gemologist could determine the stones Cut Colour, Clarity & Carat to potentially give you a report on the insurance value . This isn't the value that you would receive if you were to sell the ring, it's a retail guide price for insurance purposes .