Antique Platinum Old European Cut Diamond Cathedral Set Engagement Ring Signed. The piece is in excellent estate condition and ready to wear. It is signed B 900 Plat. 100 Irid. The cursive B is the mark of Philadelphia Jewelry company Byard Brogan which was founded in 1908. The center stone is approximately .65 carats. There is additional .10 carats of single cut diamonds. The diamonds are all conservative E color and Vs1 clarity. This is an authentic RARE antique cathedral setting, the kind you only see copies of today. 

The ring is a size 8 - 8.25. It weighs a total of 3.9 grams and stands about 6.5mm off of the finger.