Don’t let the laid-back locale fool you. Millions of dollars change hands at the Miami antique showMiami Beach is known for its bathing beauties, Art Deco architecture, and see-and-be-seen nightclubs. But when the Annual Miami Beach Antique Jewelry & Watch Show comes to town, ­jewelry takes center stage.From Oct. 14 to 16, estate jewelers from around the world will descend on the Miami Beach Convention Center to peruse the finest selection of estate jewels this side of the Atlantic. The event welcomes members both of the trade and the public, so the range of merchandise runs the gamut.For example, Paul Lubetsky, president and CEO of Windsor Jewelers in New York City, is bringing some closeout pieces that he’ll sell below cost. But he’ll also have a $5 million Oscar Heyman ring featuring a 1.75 ct. red diamond and 5.81 cts. t.w. colorless stones. He’ll offer the ring with ano