Diamonds are not stamped: perhaps the metal setting is stamped. Take your jewelery to a local jewelery shop and ask that the diamond be tested.
L stamped inside a ring
It may be the trademark for the name of the jewelery company it's from or perhaps a certain someones initials.
Self Addressed Stamped Envelope
A stamp on jewelery is usually the jewelers stamp (initials of the jeweler). It is used to identify the manufacturer of the piece.
probably a manufacturer stamp
Its gold filled not real
noggin ruckus
J.C. Penny
there is a square with a "j∆"
Did you ever find the answer to your question. I just went through my jewelery box and have an old broach with 187 stamped on the back of what looks like a gold piece. I can't find any information on it on the website. I quess I'll take it to a jeweler.
The letters RSG stamped on a ring means that the ring was preassembled. Any gems in the ring that is stamped RSG have not been certified.