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Weight from a picture, certainly not, it would need to be measured very precisely to get a "rough estimate" on it's weight.
Here some calculations. As you can see here, a half mm in length, weight goes up 25%. (from 1 C to 1.25 C)
Marquise, navette Diamond carat size chart. How big are carat sizes
Value, certainly not from a picture, quality has a lot to do with that, as much as 400% difference in stones of the same size.
And what it would cost in a store is a lot different than what a person would get for one "used".
If you got it for about the value of the gold you did good, if you paid much more....well just take it to a jewelry store, pawn shop, coin store etc, and see what they offer you.
In reality it doesn't matter what others think, if you think you got a good deal, then you did, and that's all that really matters.
Most jewelers will take a look at it no charge - they usually cant give you a total weight without removing the stones though
Ive found many diamonds in my 39 yrs of detecting - Id say the center stone is either a 1/4 or 1/3 carat (Im leaning towards 1/3) at the most
but it could be 1/2 - tough with pics (may be 1 carat total)
http://www.treasurenet.com/forums/members/29748-albums1617-picture634798.html\
IVE ONLY FOUND A FEW MARQUIS- MOST OF MINE HAVE BEEN ROUND
SAMPLE OF SOME I STILL HAVE
http://www.treasurenet.com/forums/members/29748-albums1590-picture634956.html