WatchesSep 21, 2023
Timex Wants Your Old WatchWatchesSep 26, 2023
Citizen Launches the Tsuki-Yomi A-T Timepiece
According to the watchmaker, it features the first light-powered atomic timekeeping moon phase movement.
Comprising three models, Citizen’s new “Tsuki-yomi A-T” collection utilizes the “Luna Program” unique mathematical formula to calculate moon phase via signals from multi-band radio transmitters.
New York—Thirty years ago, Citizen launched its first atomic timekeeping watch.
To celebrate, the watchmaker has just released three new models that feature what it says is the market’s first fully analog moon phase movement for light-powered watches.
They’re called the “Tsuki-yomi A-T” collection, which translates to “reading the moon” and reference the ancient Japanese moon god, Citizen said.
Each model has the Eco-Drive Cal. H874 movement. The watch calculates the phase of the moon each day by receiving signals from multi-band radio transmitters, a process that relies on a mathematical formula Citizen has developed called “Luna Program.”
A window at the six o’clock position displays the moon phase, automatically adjusting it per the signals the watch receives.
Related stories will be right here …
To celebrate, the watchmaker has just released three new models that feature what it says is the market’s first fully analog moon phase movement for light-powered watches.
They’re called the “Tsuki-yomi A-T” collection, which translates to “reading the moon” and reference the ancient Japanese moon god, Citizen said.
Each model has the Eco-Drive Cal. H874 movement. The watch calculates the phase of the moon each day by receiving signals from multi-band radio transmitters, a process that relies on a mathematical formula Citizen has developed called “Luna Program.”
A window at the six o’clock position displays the moon phase, automatically adjusting it per the signals the watch receives.
The technology also enables a “North-South” shift, meaning the display changes to match the moon phase view depending on if the wearer is in the Northern or Southern hemisphere.
The Tuski-yomi A-T requires no manual adjustment for the moon phase.
The watches feature Citizen’s “Super Titanium,” meaning titanium that is processed via the company’s proprietary surface-hardening technology called Duractect to create a scratch-resistant surface that is five times harder and 40 percent lighter than stainless steel.
The three models of the new Tsuki-yomi A-T collection feature a blue, silver, or magenta moon as the dial.
Each model has a Super Titanium 43 mm case and bracelet.
Ref. BY1010-57L has a deep blue dial, Ref. BY1010-57H has a silver dial, and Ref. BY1018-55X has a “blood moon” or magenta dial and black Duractect DCL bezel.
The new Eco-Drive Cal. H874 offers world time, perpetual calendar technology and 100 meters of water resistance.
Available now, each model is priced at $850.
More on Watches
The Latest
Lab-GrownJul 13, 2026
Stephanie Gottlieb Changes Her Mind on Lab-Grown DiamondsThe designer, who once said she’d never sell lab-grown diamonds, debuted two capsule collections designed to be fun and easy to wear.
SourcingJul 13, 2026
De Beers Announces Potential Layoffs, 2-Year Production Pause at VenetiaThe diamond miner and marketer is undergoing another round of cost-cutting measures ahead of its sale by Anglo American.
Events & AwardsJul 13, 2026
Registration Opens for JIS Fall 2026 ShowThe annual trade-only buying event is slated for Oct. 16-19 in Miami Beach, Florida.
Brought to you by
Wedding Band Trends 2026: Personalization Takes Center StageColored gemstones, artisan finishes, mixed metals, and meaningful details are shaping demand in bridal jewelry.
Events & AwardsJul 13, 2026
AGTA Accepting Entries for Spectrum 2026AGTA also has announced the lineup of judges for the colored gemstone cutting and jewelry design contest’s various categories.
Weekly QuizJul 09, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
TechnologyJul 10, 2026
There’s a New Blind Box for Luxury Watches Collectibles platform Arena Club’s new Time Boxes could contain a Rolex or Patek Philippe watch.
TrendsJul 10, 2026
Jade Trau Creates a Constellation of DiamondsThe “Constellation Plié” collar, our Piece of the Week, features diamonds arranged in a constellation of shining stars.
Brought to you by
Building the Future of Jewelry Retail: DCA Expands Education, Leadership Development, and Workforce SolutionsDCA is preparing the next generation of professionals by supporting workforce development, leadership growth, and career advancement.
SourcingJul 10, 2026
CFO of De Beers’ Consumer-Facing Division Leaves Company Shaun Wills joined the company in 2024 and was chief financial officer of the De Beers Brands and Consumer Markets division.
CollectionsJul 09, 2026
Boucheron’s New High Jewelry Collection Is an Ode to the Human Touch“Human Being” highlights the similarities and differences between us through five sets of jewelry that celebrate fine craftsmanship.
AuctionsJul 09, 2026
Pharrell Williams’ Joopiter Hires Former Bonhams Exec to Head New Watch DivisionNate Borgelt will lead the digital auction house and content platform’s new division as head of watches.
Events & AwardsJul 09, 2026
Halstead Names 2026 Grant WinnerEnoch Platero, founder and designer behind Enoch Michael, is the first Native American jeweler to win the award.
Events & AwardsJul 09, 2026
AGS, GIA Name 2026 Beatrice Shipley Scholarship WinnerAGS also announced the recipient of its “Women in Leadership” scholarship.
MajorsJul 08, 2026
Kendra Scott Joins ‘Shark Tank’ As Permanent Investor The founder of the billion-dollar jewelry and lifestyle brand will debut as a full-time “Shark” on the upcoming season of the show.
SurveysJul 08, 2026
Signet Jewelers Falls 5 Spots on NRF’s ‘Top 100’ Retailers ListPlus, why retailers should be ready to adjust as the U.S. population may decline this year for the first time since the Great Depression.
CrimeJul 08, 2026
Here’s What Thieves Stole From the Lalique Museum René Lalique’s “Woman Dragonfly With Open Wings” pendant, the first piece the museum acquired, was one of the jewels taken.
MajorsJul 08, 2026
Richline Group Promotes 2 ExecsArien Gessner and Moss Makhoulian have been elevated into newly created roles.
ColumnistsJul 07, 2026
Peter Smith: Diamond Branding and the Origin ParadoxA podcast prompted Smith to share his views on where origin fits into the natural diamond story and the viability of branded diamonds.
Events & AwardsJul 07, 2026
JA Announces 2026 Impact Initiative RecipientsThe association selected eight recipients for the funding program, which is in its second year.
TrendsJul 07, 2026
Amanda’s Style File: Ruby, White and Blue Whether celebrating America’s 250th birthday or the USA’s World Cup run, July birthstone jewelry can double as a patriotic accessory.
CrimeJul 07, 2026
Thieves Steal Millions in Jewels From France’s Musée LaliqueAround 20 pieces of jewelry were stolen from the museum dedicated to French jeweler and glassmaker René Lalique.
CollectionsJul 07, 2026
Robinson Pelham Is Partying Like It’s 1996The “Summer of ’96” campaign and collection celebrate the year the brand was founded for its 30th anniversary.
SourcingJul 06, 2026
Gemfields CEO Sean Gilbertson Steps DownAfter eight years, Gilbertson is leaving his post at the mining company, which is currently facing a slew of operational challenges.
IndependentsJul 06, 2026
Bachendorf’s To Open Fifth Store In DallasThe new location is set to open this winter, featuring the retailer’s first rotating jewelry designer residency.
MajorsJul 06, 2026
Graff Names BTS Star Jung Kook as New AmbassadorThe pop artist appears in the latest campaign for the “Laurence Graff Signature” collection.
CollectionsJul 06, 2026
Pandora’s New Baroque Pearl Collection Is a Whimsical ‘Wonder’One-of-a-kind pearls take the shape of ice cream cones, frogs, submarines, and other imaginative charms.
SourcingJul 02, 2026
London Diamond Bourse Elects First Female PresidentCharlotte Rose said her election is “a sign that this is an industry capable of change.”
