Let’s start the bidding at $8,000. That’s the going price for a “Rocks on Rocks Martini,” available at Dopo La Spiaggia, in Sag Harbor.

The drink is a more-or-less conventional martini whose stratospheric price tag is a reflection not of the bartender’s talents but of the cocktail’s garnish — a 5-carat diamond tennis necklace draped over the rim of the outsize glass.

The jewelry was designed by Manhattan luxury jeweler Jimmy The Rock Diamonds.

If you are considering buying the drink but feel guilty flashing your bling in public, be advised that $1,000 from each sale goes to the charity of your choice.

6 Bay Street, Sag Harbor, NY, 631-725-7009.

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