UPDATE ******ANTIQUE METAL RINGS FROM FARM ESTATE NON-MAGNETIC,

FOUND THESE IN A OLD WOODEN BOX IN A SHED ON A FARM ESTATE PICK. AFTER A GOOD CLEANING I FOUND ONE TO BE MARKED STERLING WITH AN ARROW GOING THRU A U, THE OTHER APPEARS TO HAVE A GOLD TINT GOING THRU IT, STILL UNSURE. SOMEONE STATED MAYBE MADE DURING WW2 WHEN THEY WERE USING LESS METAL???? UNKNOW ANYTHING ABOUT THEM. NON-MAGANETIC. THE ONE ALMOST LOOKS LIKE A HALF OF A MARBLE IN IT. CAN'T BE SURE THAT WHAT IT IS.. ANY HELP WITH I.D. WOULD BE GREATLY APPRECIATED.