Axiom Coin Exchange in Chula Vista has operated as a rare-coin and precious-metals dealer from 314 E Street since 1973, making it one of the longest-running numismatic businesses in the South Bay. The shop buys and sells American and foreign coins, gold and silver bullion, and estate collections, handling the same precious-metals trade that anchors the buy-sell-appraise model at Gold & Diamond Buyers of San Diego on Third Avenue. Inventory spans Morgan and Peace silver dollars, American Eagle bullion, pre-1933 gold coins, and world currency from European and Latin American mints. Authentication and grading services help sellers understand NGC and PCGS encapsulation standards, a numismatic literacy mission that aligns with the historical-preservation focus at Bonita Museum & Cultural Center. The shop's appraisal capability covers full estate lots — multi-drawer collections combining circulated silver, proof sets, and uncirculated commemoratives — with authentication handled through loupe inspection and precious-metals XRF testing.