Onyx necklaces bring depth and weight to your jewelry rotation. This chalcedony mineral forms in volcanic lava cavities, producing the dense black stone prized since ancient Egypt. With a Mohs hardness of 6.5-7, onyx holds up well to regular wear. Our collection of 13 onyx necklaces features natural stones set in .925 sterling silver, ranging from $479 to $6998. Each piece ships free within the US.
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Onyx rates 6.5-7 on the Mohs hardness scale, making it durable enough for necklaces worn regularly. The stone resists scratching better than softer gems like opal or pearl.
Real onyx feels cool to the touch and warms slowly in your hand. It has a waxy luster when polished and shows no air bubbles, which would indicate glass imitation.
Clean onyx with a soft cloth and lukewarm water. Avoid ultrasonic cleaners, harsh chemicals, and prolonged sun exposure, which can fade the stone over time.