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Every kiss begins with ... an engagement ring that costs MORE THAN MOST PEOPLE MAKE THEIR WHOLE FRICKIN' LIVES -- if you're Gabrielle Union and Dwyane Wade, that is.

Dwyane popped the question Saturday night with an 8.5 carat cushion cut diamond ring (pictured below) made by go-to celeb jeweler Jason of Beverly Hills ... and TMZ has learned it goes for nearly 1 million bucks.

We're told Dwyane had been on the hunt for months for the stone of her dreams ... and his jeweler made 3 trips to Miami looking for the perfect jewel ... and third time was a charm.

Bravo.
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