What curse did the opal necklace have?

The Opal Necklace was a cursed Dark object, made of opals, that was, for a period of time, on sale at Borgin and Burkes. It was claimed to have taken the lives of nineteen different Muggles. It was also used by Draco Malfoy in a failed attempt to assassinate Albus Dumbledore, that ended up cursing Katie Bell instead.

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Is the opal necklace a Horcrux?

Is Quirrell a Horcrux? Quirrell is, in effect, turned into a temporary Horcrux by Voldemort. He is greatly depleted by the physical strain of fighting the far stronger, evil soul inside him.

How did Voldemort make a Horcrux?

After robbing Hepzibah, Voldemort made another Horcrux by killing a homeless Muggle, then hid the locket in a remote cave protected by Dark magic and Inferi. Correspondingly, is ron weasley a pure blood? His first appearance was in the first book of the series, Harry Potter and the Philosopher's Stone, as the best friend of Harry Potter and Hermione Granger. He is a member of the Weasley family, a pure blood family that resides in "The Burrow" outside Ottery St. Catchpole.

In respect to this, why does bellatrix call harry a half-blood?

Because to a pureblood fanatic like Bellatrix, Harry is a Mudblood because one of his parents (Lily Evans) was a Muggleborn. Anyone with Muggle ancestry is one, including Snape since his father was a Muggle (Tobias).