The Diamond Resorts credit card is a Mastercard and thus can be used anywhere Mastercard is accepted, and Mastercard is accepted everywhere around the globe, so you won’t have any problems. However, if you think about rewards redemptions, things are not that easy. You can redeem your rewards as statement credit towards Diamond Resorts purchases as well airfare and car rental purchases, provided those purchases are more than $50.
If this is limiting to you, you may try regular rewards credit cards. They allow you to redeem rewards for any purchases, some of them work like regular cash back cards.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.