Another - perhaps better - option is having a cooler or thermos full of HOT water that you can fill your gloves with prior to your second dive. A lot of people who dive on our boat do this and report far better results with this approach vs diving with a "fresh" set of gloves. (A fresh set of gloves will still fill with cold water pretty quickly, whereas a "wet but hot" pair of gloves take longer to displace the warmth with cold.) This works great for your hood as well.
Also, if you are diving wet be sure to immediately GET OUT OF YOUR SUIT during the surface interval. Wearing a wet wetsuit on land will wick heat away from your body like nothing else. It's not enough to just cover up the wetsuit and hope for the best. Get out, get dry, get warm! Your body temp will have dropped appreciably during your first dive; you need to re-warm it as much as possible before the next dive or you'll be even colder on that one. And stash your wetsuit somewhere warm too, where you can hang it up if possible. At a minimum don't leave it out in the cold or rolled up in a ball somewhere.
