Celtic Black Onyx Engagement Ring Set in 14K White Gold

This Celtic black onyx ring set centers a pear-cut natural black onyx — deep, velvety midnight black — within a Celtic-inspired setting of interwoven knotwork, matched to a coordinating band, in cool solid white gold. Now available in your choice of karat and color, plus platinum. A modern-gothic two-piece set that carries the symbolism of Celtic heritage: strength, protection, and eternal connection.

Choose your metal & karat

This set is made in solid gold — the metal itself, not plating or vermeil over a base metal. Use the drop-down to choose the karat and color that suit you, or step up to platinum:

Higher karat means more pure gold and a warmer tone; lower karat is harder and more budget-friendly. Not sure which is right? Our 10K vs 14K vs 18K gold comparison guide walks through durability, color, and price. Cool white gold and platinum sharpen the contrast with the black onyx; yellow or rose gold warm the knotwork.

The black onyx

The pear-cut center is a genuine natural black onyx — a form of chalcedony quartz (6.5–7 Mohs) with a deep, velvety black color that reads bold and mysterious. To be clear, this is natural black onyx, not black diamond. Onyx has long symbolized strength, protection, and emotional balance. Our non-traditional engagement ring guide and moissanite explainer are useful reads for this style.

The Celtic design & set

Interwoven Celtic knotwork frames the onyx — a symbol of eternal, unbroken connection. Sold as a two-piece set; each ring can also be worn on its own. Explore more Celtic engagement rings and black onyx engagement rings.

Sizing & care

Black onyx is 6.5–7 Mohs — fine for daily wear with sensible care; avoid hard knocks that could chip the pear point, and clean with warm soapy water and a soft cloth. Both rings should be ordered in the same size; please reference our sizing guide before ordering. An optional written appraisal can be added from the drop-down menu (non-refundable once completed).