Not only is that a Silver Diamond, but, judging from the tint, it may well be an original which, imo, was the best version of the Silver. I have an original and still love it. I had a re-issue, drilled about like the one pictured, and didnt like it nearly as well. Just a bit of a warning - GUARD THE PRECIOUS or someone will try and tell you it's a blue dot and steal it away from you.
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"I do desire that we may be better strangers." Willie the Shake, As You Like it(III,ii)
I'm 61 years old — too young for Medicare and too old for women to care.