Antioch's Black Diamond Mines Regional Preserve offers visitors a unique opportunity to learn about California's rich mining history.

We’re not 100% set on anything yet, but we’re definitely throwing some ideas around,” said Ryan Long, the sales director for Bay Area Diamond Company, which is hoping to come up with a ...

The 2025 Diamond Certified Local Experts Calendar is sent for free to thousands of Diamond Certified Preferred Members throughout the Greater San Francisco Bay Area. Diamond Certified companies also ...