The rose gold ring, dated to around 1860, features a rectangular faceted light purple amethyst stone with an etched Rose of Sharon flower.
Other items include a hand-painted jewellery box with a gold floral design, dress rings, a pair of Moroccan silver earrings and red pear-drop earrings. A number of necklaces were also taken including one described as a round Incan sun necklace.
The items were stolen from the family home in Holloway Hill, Godalming between December 22 and January 2. It is believed that the intruder forced open a side window and gained entry to the home while the family were away.
Detective Sergeant Charley Bryant said: “The ring was a special anniversary gift and is of huge sentimental value to the family. Although there are similar amethyst rings with the Rose of Sharon engraving they all differ in appearance and this particular unique piece is irreplaceable.
“We need the public’s help in trying to trace its whereabouts. I would urge anyone in the antique or jewellery business to keep an eye out for it and to let us know if they believe they have seen it being offered for sale.
“The beloved ring may not be of a high value but it is priceless to the owner and her husband – any information may help us return it to them and bring those accountable to justice.”
He asked anyone with information to contact 101 quoting crime reference number 45170000590 or you can use the online reporting system found at https://report.police.uk/.
Alternatively, the independent charity Crimestoppers can be contacted anonymously on 0800 555 111.