Recently though I have seen quite a lot of solitare engagement rings (top tip if you're thinking about it: definitely buy a ring before you propose - she might like it, which will save you heaps of trauma!), and I'm starting to get a feel for it. But what I'd like to know is how/if age affects value.

I've seen a 1930's 1.4ct solitare, set in platinum costing $5300, it is round, seems very white and I can't see any flaws with a looking glass. It doesn't sparkle as much as others I've seen, which is perhaps due to an old cut? But is this too cheap? Is it likely to be a fake at this price, or is it a bargain? Or is this about right for a 1930's solitare?

There could be a few reasons. It could be old cut indeed, not modern round brilliant.

It can be a poor cut.

Its facets can be worn off.

Besides the diamond doesn't have any lab report...

I'll get the lab report in due course and publish it here.

If the diamond is too deep is it possible to get it re-cut??