Diamonds are not a dog’s best friend.

A woman has been admonished on Reddit for trying to pose her engagement ring on her dog’s nose – and shouting in surprise when the pup swallowed the sparkler.

“WCGW [what could go wrong] if I try to show off my new engagement ring?” Redditor DanyHeatley50in07 wondered, sharing now-viral footage that’s been upvoted 31,000 times since hitting the platform on Monday.

According to The Sun, the fiancée was trying to pose her pet with the bling for a photo-op announcing the engagement.  

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As seen in an 11-second clip of the must-see moment, the woman instructed her golden retriever to “sit” and “stay,” placing the ring on its nose. After a moment of calm, the dog expertly flicked off the item into its mouth like a treat.

"Oh!" the unseen woman exclaimed, as a man in the background yelled “Thor!”

Unsurprisingly, most Redditors agreed that the stunt was a doggone dumb idea in the first place.

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“Well what the f--- did you think was going to happen?!” one user asked in a chiding comment that’s racked up nearly 4,000 points.

“Now it's a teething ring,” a more forgiving user said. “I bet the dog spit it out though.”

“First command I taught both my puppies was ‘out’ and it means to drop whatever they have in their mouth. Took a long time but it's come in handy plenty of times,” one dog owner shared.

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Other animal lovers said they were truly alarmed by the bad behavior.

“This lady deserved that. You don't put inedible objects on a dog's snout like it's a treat. What if the ring harms the dog's digestive tracts?” one wondered.

“That’s irresponsible. Take care of your animals!” another exclaimed.

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“Whoever was gonna marry her... I'd think about it again lol,” one joked.