G.F. Espo is the manufacturer of the ring.
The value of a 10kt gold-filled (gf) ring with a ruby may vary depending on factors such as the quality and size of the ruby, the condition of the ring, and current market trends. Generally, gold-filled jewelry is less valuable than solid gold jewelry. It's recommended to have the ring appraised by a professional to determine its specific value.
Ok What I think that it means is 14KT = 14karat GF=gold filled and ESPO is the maker. Sometimes when marking the piece the letters don't always line up exactly the way that they should. This is my best guess.
10kt gf typically indicates the item is gold-filled, meaning it has a thin layer of 10 karat gold bonded to a base metal. The gold layer is thicker and of higher quality compared to gold-plated items, but it is still not solid gold. Items marked as 10kt gf are more durable and have a longer lifespan than gold-plated items.
espo was the company that made it. 925 means sterling silver.
10kt
10 mg gold
"The marking ESPO or also found as ESPO-FLEX are the marks of Esposito Jewelry, Inc. a costume jewelry company located in Providence Rhode Island, USA. These marks were first used in 1951." I cut and pasted the above answer from http://www.modernsilver.com/MYSTMARKS.html
Plated with 10kt gold
416 is 10k
When these markings are stamped on a ring 18kt HGT ESPO, HGT stands for heavy gold electroplate meaning the ring is gold with a small amount of 18kt. ESPO is the jewelers stamp, in this case Joseph Esposito of Esposito Jewelry.
"The marking ESPO or also found as ESPO-FLEX are the marks of Esposito Jewelry, Inc. a costume jewelry company located in Providence Rhode Island, USA. These marks were first used in 1951." I cut and pasted the above answer from http://www.modernsilver.com/MYSTMARKS.html