Marked 625 (15k) and Z indicate that it is made in the 1874 according to Birmingham Hallmark date letters. 

There are 6 emeralds and 4 sea pearls. A very rare found in very good condition. 

US size#6.5

1874 Gold Ring with Emerald and Sea Pearl

HK$17,998.00 Regular Price
HK$14,398.40Sale Price