1. ShowsAre you ready to get your color game on? The Tucson, Ariz., gem shows open this month, to the delight of gemstone lovers the world over. Find out about Greenland’s new ruby and pink sapphire source from True North Gems at the American Gem Trade ­Association ­GemFair (at the Tucson Convention Center Feb. 3–8). Stock up on ­trending stones like Csarite and ­Zambian emerald at the nearby GJX show. And check out finished jewelry at the second annual JCK Tucson at the JW ­Marriott Tucson Starr Pass Resort & Spa Feb. 2–7. With some 40 shows in the Arizona desert (visit ­tucsonshowguide.com for the full list), allow plenty of time to explore, and be ­prepared to blow your budget.2. WatchesAt an Antiquorum auction in December, an anonymous collector purchased an Omega Constellation Calendar wristwatch owned by Elvis Presley and later gifted to his friend, the musician Ch