Antique Estate Bar Pin set in 10k Gold w/ Red stone

Antique Estate Bar Pin set in 10k Gold . marked on back. Appears to be a Ruby. but I can not guarantee that since it was not tested. it's a deep ruby {red} stone. Found at estate auction. 2 1/8" long. setting is 1/8" wide. Looks very old. Filigree design stone is ~1/8 " long. ~1/16" wide. I have no personal knowledge. I'm not a jeweler. please ask questions. pin is as pictures indicate. to order email.