Few anniversary traditions carry as much weight as the gemstone milestones: ruby for the 40th wedding anniversary, sapphire for the 45th. These are not arbitrary pairings — they reserve the two most enduring colored gemstones on earth for the marriages that have endured longest. This guide explains where the tradition comes from, and how to choose an anniversary ruby or sapphire that lives up to the occasion.
Why Ruby Marks the 40th Anniversary
The traditional anniversary gift list, formalized in the early 20th century by the American National Retail Jeweler Association, assigns materials of increasing rarity and permanence to each milestone — paper for the first year, silver for the 25th, gold for the 50th. Ruby was given the 40th because it has symbolized passion, protection, and devotion for well over two thousand years. In ancient Sanskrit texts, ruby is called ratnaraj — the king of gems.
There is also a practical logic to the pairing. Ruby is corundum, the second-hardest natural gem material after diamond, rating 9 on the Mohs scale. A ruby given on a 40th anniversary is expected to outlast not just the marriage it celebrates but the generations that follow. It is one of the few gifts that functions equally as jewelry, heirloom, and store of value.
Sapphire and the 45th: The Stone of Fidelity
Sapphire holds the 45th anniversary, and its symbolism could not be more fitting: for centuries, blue sapphire has represented loyalty, constancy, and truth. It is the reason sapphire became the classic betrothal stone of European royalty long before diamonds took that role — a tradition revived when Princess Diana's sapphire engagement ring passed to Catherine, Princess of Wales.
Sapphire also offers a flexibility ruby does not: it occurs in nearly every color. Couples who want to honor the tradition without defaulting to blue can choose a pink sapphire for romance, a yellow sapphire for optimism, or a teal sapphire for something distinctly modern. All are corundum, all carry the same durability, and all satisfy the 45th-anniversary tradition.
How to Choose an Anniversary Stone Worth the Milestone
For a 40th or 45th anniversary, the stone should be chosen to the same standard you would apply to an important engagement ring. Three factors matter most:
- Color first. In both ruby and sapphire, color drives the majority of value. Look for vivid, well-saturated color that is neither too dark nor washed out. For rubies, the most desirable range runs from pure red to slightly purplish red; for blue sapphires, a rich velvety blue with strong saturation.
- Treatment disclosure. Most rubies and sapphires on the market are heat-treated, which is stable and accepted — but it must be disclosed, and it affects price significantly. An unheated sapphire or unheated ruby with a lab certificate confirming no treatment carries a meaningful premium and stronger long-term value, which many couples feel suits a milestone gift.
- Independent certification. For any significant anniversary purchase, insist on a report from a respected laboratory such as GIA or GRS confirming the stone is natural, identifying any treatment, and — where possible — stating its geographic origin.
Loose Stone or Finished Jewelry? The Case for Bespoke
One of the best-kept secrets of anniversary gifting is buying the gemstone loose and having it set locally. Starting with a certified loose stone lets you select the ruby or sapphire itself on its merits — color, clarity, cut, certificate — rather than accepting whatever stone happens to be in a pre-made piece. It also opens the door to a bespoke design: a ring, pendant, or pair of earrings built around the stone and the story behind it.
For earrings, matched pairs deserve special mention. Two stones matched for color, size, and cut are considerably harder to assemble than two individual stones, which is why matched sapphire pairs are a favorite choice for milestone anniversaries — the symbolism of a perfectly matched pair speaks for itself.
A Note on Budget and Value
Anniversary buyers often assume fine rubies and sapphires are out of reach, but the market spans an enormous range. A beautifully cut heated sapphire of one to two carats can be surprisingly accessible, while fine unheated stones of three carats and above compete with — and often outperform — diamonds as long-term stores of value. The key is buying from a source that prices transparently and discloses everything. At Thai Gems, we have manufactured and sourced sapphires and rubies in Bangkok for over 70 years, selling certified stones directly from the cutting source without retail markups.
Whether you are marking a 40th with ruby, a 45th with sapphire, or simply celebrating another year together, explore our full range of rubies and sapphires at thaigems.com — every stone clearly disclosed and available with independent certification. Contact us for help selecting a stone worthy of the milestone.