What is 750 Italy 0n white band ring?

Answer 1

"750" means the band is 18Kt gold. It also means that it is 75% pure gold (25% alloy metals).

Gold karats* (Kt) are essentially a fraction:

24Kt is 100% pure gold. 24/24

18Kt is 75% pure gold. 18/24 (Sometimes stamped 750)

14Kt is ~58.5% pure gold. 14/24 (Sometimes stamped 585)

Etc.

STERLING SILVER jewelry is usually stamped 925, which means it is 92.5% pure silver.

FINE SILVER jewelry is usually stamped .999, meaning it is 99.9% pure silver.

Platinum jewelry is usually stamped 900 or 910, meaning it has 90% or 91% pure platinum content.

"Italy" means it was made in Italy.

*In the US and Canada, "Karats" are used to measure % of precious metal content, not to be confused with "Carats", which is used measure the weight of gemstones. (20grams = 100ct)