Diamond Mountain Stables
A Quest for Excellence
The DMS Team
DMS Associate Team
Open Horses
DMS Dogs
Friends of DMS
Show Updates
Hay Business

Diamond Mountain Stables (DMS), located in the foothills of the Napa Valley, was established in 1983 by Calistoga High School sweethearts Macella O'Neill and Charles White.

 Their goal was to develop a business, training and competing with jumping horses.
They began with one black race horse and a couple of local students. 

Over the years Macella's life long love of horses and Charlie's keen sense of business 
have garnered an international reputation in the world of show jumpers.

Macella and Charlie have achieved success in every ring across the country and internationally. Macella's riding has taken her to the World Cup finals and she has enjoyed tremendous success with many victories at the most prestigious venues along the way. She's been the leading Norcal and PCHA rider and money winner on multiple occasions. Their students have won medal finals, year end awards, young riders medals and the PCHA Grand Prix Rookie of the Year award and are often found sporting championship coolers and prizes and in the winners circle on any given day.

DMS offers lessons for the beginner as well as those intent on competition in a warm family like atmosphere.

Diamond Mountain Stables Specializes in:

Equine Sales
Feed and Hay Sales