10k gold ring with ADL initials.

Abraham David Loewenstark1854..1886 
(registered Jan 1846)

 Antwerp Diamond Laboratory

http://ocgold.com/blog/?p=16784

here is few links. here's the problems when checking out gold and diamonds....You can not tell from a photo if their real or not, you must have a hands on test of gold and stones...your ring looks old,but not a 1800's old look, the stamp is to perfect.(understand).like a mechine did it.. ADL stamps can be found and many rings and pendents on EBay and other sites.. but they are not  1800s ,, with that said,, you need to have it tested before any type of worth can be put  on it...Good Luck..................most 10k rings don't have real dimonds...  let me know if the diamonds test real..

any pawn shop will test it for you....if you ask nice..

I disagree with the comment that most 10k don't have real diamonds. I worked with jewelry for years and most "do" have real stones. Electroplated usually doesn't. He's correct in saying to have it checked.

(I disagree with the comment that most 10k don't have real diamonds.)sascijo? 

I miss quoated myself on my owm comment, I should have said most 10k rings that I have scraped and tested, did not have real diamonds. I can show you a small box full of fake stones, I found more fakes then real. 

I know I'm jumping into this late, but for anyone else who might come along and be interested. I'm quite familiar with Abraham David Loewenstark's jewelry. I can't see the mark in these photos. He did mostly work with gold and more often 10K than 14K, but this is not his style.

Almost every piece he made had a semi-precious stone, usually a ruby or sapphire, with tiny diamond "chips" to accent the stone. He had a traditional, simple late Victorian and Edwardian style. Nothing too elaborate. He chose excellent main stones and set them beautifully in a way that made them eye-catching, but not gaudy.
I have a lovely pendant by him if anyone would like to see an example of his work. Just message me!