Onyx (July, UK) — The British Alternative July Birthstone
Onyx (July, UK) — The British Alternative July Birthstone
Onyx as a recognised July birthstone in British tradition, listed alongside ruby and carnelian by the National Association of Goldsmiths
Onyx is recognised as an alternative July birthstone in the British tradition, sitting alongside ruby and carnelian on the National Association of Goldsmiths (NAG) United Kingdom birthstone list. The British list differs in several months from the standardised American list maintained by the American Gem Trade Association (AGTA) and the Jewelers of America (JA), and the inclusion of onyx for July is one of the differences most often noted in the trade. The designation reflects historical British preferences and, in particular, the prominence of black onyx in Victorian mourning jewellery, when the stone was widely worn and easily available in high-street retail.
The British and American lists
The American July birthstone list is straightforward: ruby, with no widely recognised alternative. The British list adds onyx and carnelian as alternatives, providing more accessible options for buyers who cannot or do not wish to purchase ruby. The combination of a primary high-value stone with one or two affordable alternatives is a recurring pattern in the British list, and the underlying logic is that birthstone jewellery should be available across a range of price points so that the tradition is not reserved for the wealthiest customers.
The NAG list has been published in various forms since the early twentieth century and was most recently updated in collaboration with the wider British jewellery trade to reflect contemporary practice. Onyx's place on the list has been stable for decades, and most British jewellers will offer it without hesitation when a customer asks for July alternatives.
The Victorian mourning context
The British July onyx tradition is most directly traceable to the nineteenth century, when black onyx — alongside jet, vulcanite, and black enamel — was the dominant material in mourning jewellery. The mourning protocols formalised after the death of Prince Albert in 1861 created an extended market for black gemstone jewellery, and the deep-black dyed chalcedony then becoming widely available from the Idar-Oberstein cutting trade fitted the requirement perfectly. Onyx remained in continuous British retail use through the twentieth century, and its place on the birthstone list reflects the long familiarity of British jewellers and customers with the material.
In the trade
For British retailers, the onyx July designation is a useful selling point for customers who ask about birthstone options across a price range. Black onyx works well in signet rings, pendants, lockets, and earrings, and pairs effectively with both yellow and white metals. Hardness 6.5 to 7 makes it durable enough for any normal jewellery use, with no problematic cleavage. Cleansing should be by mild soap and warm water; the dye treatment used in most commercial black onyx is stable but should not be exposed to strong solvents or prolonged heat, and ultrasonic cleaning is generally safe but should be avoided for cameo work or for material with visible fractures.
Buyers seeking the regional British character of the birthstone tradition can look to dealers and antique jewellers in London, Edinburgh, and the major regional centres, where Victorian and Edwardian onyx pieces appear regularly in the trade. Modern onyx birthstone jewellery is widely available across the British high street and online retail. See also onyx, chalcedony, and the broader entries on birthstone traditions for related material.