WELCOME TO DOUBLE DIAMOND AUSTRALIA Double Diamond Australia is quickly becoming one of the most trusted names in the horse industry. With an ever growing catalog of tack featuring all of the most popular brands, we are your one stop horse shop. We are known for our large range of competitively priced, quality products and of course our superior customer service. We hope to have everything you need for you and your horse. However, if you are unable to find a particular item, please check with us to see if we can locate it for you.