I am the original poster. The ring is very simple. The bit that would unlock a lock is closest to the 15c Mark. It's a very simple key with an oval at the end. Is there an email account I can send pictures too? The opal is in very good condition. Still very beautiful. The gold claws are a little worn down but the gem is perfect.
Megan
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Key Marks on Antique Jewelry by: Yvonne
Good Morning Meagan!
thanks for writing in. Your question relates to antique hallmarks so I have moved your submission into the hallmark guru forum.
Meagan, the "key" imprint could be one of several marks. It is hard to tell without a photo. There are a few "key" marks and possibilities. We cannot dismiss the possibility of it being an export mark. Do you have Dutch Ancestry by any chance? The key in a rectangle was also the Dutch Tax Mark on Gold and Silver for Export for over 100 years, from 1814 - 1953.
Are there any other marks besides what you have described, or any more background information that might help? The exact shape of the key is important. How has your Gran's Gem Opal a popular gem during this period, stood up to the test of time?
