Ruby is the gemstone designated for the 40th wedding anniversary, a milestone universally known as the Ruby Anniversary. The association is recognised by authoritative trade bodies including the National Association of Goldsmiths in the United Kingdom and Jewelers of America, and it carries a symbolic logic that is difficult to dispute: ruby is among the rarest, most durable, and most coveted of all coloured gemstones, qualities that mirror the achievement of a four-decade marriage.

The Symbolism

Ruby's deep red colour has been linked across cultures and centuries to passion, vitality, and enduring commitment. As a variety of corundum — second only to diamond on the Mohs hardness scale at 9 — it is a stone built to last, a quality that resonates with the longevity a 40th anniversary represents. The intensity of a fine ruby's colour, described in the trade as pigeon's blood when it reaches its most prized saturated red with a faint blue undertone, offers a visual language for the depth and richness of a long partnership.

Choosing a Ruby for the 40th Anniversary

Rubies of gem quality originate from a number of celebrated localities, each with a distinct character:

• Mogok, Myanmar (Burma): The historic benchmark for ruby quality. Mogok stones are prized for their fluorescence under ultraviolet light, which gives them a glowing inner fire even in subdued conditions. A certified, unheated Mogok ruby commands a significant premium.
• Mozambique: The Montepuez deposit, producing commercially since around 2009, has become the most important ruby source in the world by volume. Mozambique rubies can achieve exceptional colour saturation and are now well-established in the fine jewellery market.
• Mong Hsu, Myanmar; Luc Yen, Vietnam; Greenland: Additional sources that contribute to the global supply at various quality levels.

For a 40th anniversary gift, the most meaningful choice is typically a ruby that has been assessed by a reputable independent laboratory — the Gübelin Gem Lab, SSEF, or GIA — with particular attention to whether the stone is unheated or has undergone heat treatment. Heat treatment to improve colour and clarity is standard practice and widely accepted in the trade, but an unheated stone of fine quality carries a notable premium and a certificate confirming this status adds both provenance and value.

Treatment Considerations

The majority of rubies on the market have been heat-treated to enhance colour and reduce the visibility of inclusions. This is a stable, permanent treatment that does not require special care. A smaller proportion of stones on the market have been treated with lead-glass filling, a more invasive process that significantly improves apparent clarity but requires careful handling and is disclosed as a substantial treatment by all major laboratories. Buyers should request laboratory documentation and confirm the treatment status before purchase, particularly at higher price points.

Settings and Jewellery Forms

Classic settings for anniversary rubies include platinum or 18-carat gold mounts — white metal allows the red of the stone to dominate, while yellow gold imparts a warmer, more traditional character. Rings, pendants, and earrings are all appropriate forms. A suite combining a ring with matching earrings or a pendant is a particularly considered gift for a milestone of this significance. Burmese and Mozambique rubies are frequently seen in pieces by major jewellery houses, and the secondary market for signed pieces featuring fine rubies is active at auction.

Care

Ruby is a robust gemstone suitable for everyday wear. It may be cleaned safely with warm soapy water and a soft brush. Ultrasonic cleaning is generally safe for heat-treated stones but should be avoided for any ruby that has undergone lead-glass filling. As with all fine gemstones, storage away from harder materials and periodic professional inspection of the setting are advisable.

Further Reading

• GIA Ruby Overview — gia.edu
• AGTA Ruby — agta.org