1. "CIRO was founded in 1917 in London, prior to the First World War. The "CIRO-Pearl" is the cornerstone of the company. There were no cultured pearls at this time and true pearls were very precious. The "CIRO-Pearl" was the first affordable and attractive alternative to true pearl jewellery. In the roaring twenties, CIRO branches were founded in New York, Paris and Berlin. By the time cultured pearls hit the market, CIRO was already an established brand".
http://www.ciroshop.at/en/company/content/36
2. CIRO of BOND Str. (mostly Watches, New York, USA) - ca 1921 - 1940s
I'm not sure of the relationship between the two above. You might like to consider getting them appraised - More information on appraisals can be found Here...
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