Cant Figure Out This Hallmark

[Pepperlizard]

Can't Figure Out This Hallmark

I found a sterling silver ring at the beach today, but I can't figure out a part of the hallmark that is imprinted inside of the band. It Says SD[].925. I Know that the ".925" means 92.5% silver, but I have no idea what the "SD" means. I have been on the internet for the past hour searching for an answer but all I could come up with was Steven Douglas and Synthetic Diamond, and given that I found two possibilities I am at a fork in the road and don't even know if either of those is correct. Can someone please help me?

 

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[Mackaydon]

It could mean 'silver dipped'.
Don....

 

[koolaidsmile]

I believe it means that the ring is silver and the stones are cubic zirconium

Kathy (koolaidsmile) :-)

 

[koolaidsmile]

It's not silver dipped because it has the 925 mark on it that already means that the percentage of silver in it

Kathy (koolaidsmile) :-)

 

[koolaidsmile]

There's also a very good chance that SD is the designers initials

Kathy (koolaidsmile) :-)