Turquoise Inlay Letter J Vintage Silver Pendant

Beautiful intricate artisan made letter J turquoise inlay silver pendant. This vintage pendant is marked Mexico on the inside bail. There are additional letters I can't quite identify. They are normally the maker's mark or workshop. I believe it is sterling silver, but I can't confirm. The pendant without the bail measures 1 inch in length and approx 1/2 inch at the bottom. Weighs 5.4 grams. Excellent Vintage condition.