When we got engaged in 1975, my engagement ring was a .20 diamond. It was on the yellowy side in colour. It was in a white gold setting with 4 claws which made it look square although it was a round diamond. The band was yellow gold. It cost £67.00...
On my 50th birthday, my husband took me to the Jewellery Quarter in Birmingham to choose a piece of jewellery and I chose a three stone ring, the diamonds in which was approximately the same size as my original diamond.
I wear that (alongside the new wedding ring which I bought to match the size of the band on the new ring). My original engagement ring sat safely in its box. Until we were burgled. They took quite a lot of pieces of sentimental value, like my grannie's 22ct broad wedding ring which was such a part of my memories (holding her hand and seeing her ring...) and I don't think I have ever really forgiven them.
To the extent that a few years ago I bought a second hand solitaire diamond ring, which (after the stone fell out of its 4 claw setting) I had reset into a six claw "Tiffany style" setting which I chose in the Jewellery Quarter. I alternate between the singe stone and the three stone ring.
And I always take my rings off at night, when I'm showering, washing up etc.
With some of the insurance money, I bought myself a diamond half hoop eternity ring, which I sometimes wear instead of my wedding ring.
I haven't changed the husband (but he's not really the jewellery-buying type...)