Best find yet, gold ring

I found this last weekend. Going to be hard to top.
14 grams, 3 real diamonds
It has 2 stamps inside, one 750 and a 375. I think theres 2 different gold purities in it, anyone who can cast light on this is welcome. I did a displacement test and got an sg of 12.5 which is 10k gold

Well, I tested this with my acid kit today and it's 18k. Mystery solved.
 
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