The 70th wedding anniversary is traditionally associated with platinum, the rare, naturally white precious metal that has long served as a benchmark of enduring value and refinement. Unlike the gemstone materials assigned to most other anniversaries, platinum is a metal rather than a mineral species — yet its symbolic weight is considerable: its extraordinary rarity, resistance to corrosion, and near-indestructibility make it a fitting emblem for a marriage of seventy years. The 70th anniversary is formally recognised as the platinum anniversary by Jewelers of America and by the National Association of Goldsmiths in the United Kingdom.

Why Platinum

Platinum's selection for this milestone is rooted in both material and metaphorical logic. As one of the rarest elements in the Earth's crust — far scarcer than gold — platinum carries an inherent prestige that aligns naturally with the exceptional rarity of a seven-decade marriage. The metal does not tarnish, does not corrode, and retains its mass even with prolonged wear; unlike gold alloys, which gradually shed material through abrasion, platinum develops a surface patina over time that many connoisseurs regard as evidence of character rather than deterioration. These qualities — permanence, resilience, and quiet distinction — mirror the qualities celebrated at a 70th anniversary.

In the jewellery trade, platinum is typically encountered as an alloy of 95% platinum with 5% iridium, ruthenium, or cobalt (marked Pt950), though higher purities exist. Its density (approximately 21.45 g/cm³) gives platinum jewellery a satisfying heft that distinguishes it immediately from white gold. Its naturally white colour requires no rhodium plating to maintain its appearance, making it genuinely low-maintenance for heirloom pieces intended to pass between generations.

Anniversary Jewellery Traditions

Because platinum is a metal rather than a stone, 70th anniversary gifts most commonly take the form of jewellery pieces in which platinum itself is the primary material — rings, bracelets, or brooches — often set with diamonds or other colourless and near-colourless gemstones that complement the metal's cool, bright tone. Diamond is a natural pairing: both materials are associated with permanence, and the combination of platinum and diamond has been a hallmark of the finest jewellery houses since the Edwardian period, when advances in metalworking first allowed platinum to be worked into the delicate millegrain and knife-edge settings that defined that era's aesthetic.

For those who prefer a coloured stone, white sapphire, white topaz, or even a fine colourless goshenite beryl can be mounted in platinum without visual conflict. Some couples choose to remodel existing family jewellery — resetting stones inherited from earlier generations into a new platinum mount — as a way of marking the anniversary while creating a tangible link across family history.

Rarity of the Milestone

A 70th wedding anniversary presupposes a union of extraordinary longevity. Statistically, reaching this milestone requires both partners to have married relatively young and to have enjoyed exceptional health and longevity. The platinum anniversary is therefore among the rarest of all anniversary designations in practice, which reinforces the aptness of its material: platinum itself is mined in quantities roughly thirty times smaller than gold on an annual basis, with the principal sources concentrated in South Africa's Bushveld Igneous Complex, Russia's Norilsk region, and, to a lesser extent, Zimbabwe and Canada.

In the Trade

Jewellers and gemmologists advising clients on 70th anniversary pieces will typically emphasise platinum's long-term value as an heirloom material. Its prong settings hold gemstones more securely over decades of wear than equivalent white-gold settings, because platinum does not thin as rapidly with repeated polishing. For a gift intended to commemorate seventy years and to survive further generations, these practical virtues reinforce the symbolic ones. Hallmarking requirements vary by jurisdiction, but in the United Kingdom, platinum articles above the minimum weight threshold must be assayed and hallmarked by one of the four Assay Offices, providing a permanent record of metal purity.