it is not g25, it is actually .925, as in .925 silver (92.5% pure silver).
To measure the inside diameter of a ring using a vernier caliper, you must use the small jaw or the internal jaw of a vernier caliper.
28
It may be PB, not PD? part of the B may be worn away...if you have a loupe or magnifying glass you should look closely... a P or PB after the karat mark stands for Plumb...which means it is exactly 14K gold. 14K gold is softer than 10K and wears away easily, especially on rings. Or,... it could also be a makers mark.
uc= Rn/pD
PD 925
It is probable the catalog number of a seller.
PD EP stands for Pro Deo Et Patria-for God and Country.
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