

QUICK SUMMARY
Hamilton has expanded its Jazzmaster Open Heart collection with a pair of new dial colours. One is green and the other is midnight blue with a sparkling finish.
Available in two sizes and with several strap options, the watches are priced from £990.
Hamilton has added a pair of new colours to its Jazzmaster watch series, including one green dial and one with a blue texture inspired by a type of quartz.
First is the green model, which is available in a 42 mm case and with several strap options, including a five-link bracelet and a brown leather strap.
But arguably the more interesting addition to the Jazzmaster Open Heart family is the blue model. This is available in 36 and 42 mm case sizes, and has a finish that Hamilton says is inspired by aventurine, a form of translucent quartz with sparkles of mica.
As with other variants of the Jazzmaster, both new watches have the Open Heart dial design that gives a glimpse at the automatic mechanical movement within. There’s also an exhibition case back on the rear for an even better look at the H-10 caliber mechanism, which has an impressive 80 hours of power reserve and a Nivachron balance spring for protection against magnetism.
As with the green dial, the blue version is available on a five-link stainless steel bracelet or a leather strap, in this case colour-matched to the midnight blue dial. The dial is protected by a sapphire crystal and Hamilton says the watch has 50 metres of water resistance, so it’s safe to shower and swim with but shouldn’t be taken to any serious depth.
Despite the relatively complexity of the design, the Jazzmaster shows only the time, and there’s no date window or further complications. It’s all about the shimmering dial and that semi-skeletal Open Heart design.
Available now, the 42 mm watches are priced at £990 on both the bracelet and leather strap, while the larger 42 mm version is £1,065.
Sign up to the T3 newsletter for smarter living straight to your inbox
Get all the latest news, reviews, deals and buying guides on gorgeous tech, home and active products from the T3 experts
Alistair is a freelance automotive and technology journalist. He has bylines on esteemed sites such as the BBC, Forbes, TechRadar, and of best of all, T3, where he covers topics ranging from classic cars and men's lifestyle, to smart home technology, phones, electric cars, autonomy, Swiss watches, and much more besides. He is an experienced journalist, writing news, features, interviews and product reviews. If that didn't make him busy enough, he is also the co-host of the AutoChat podcast.
-
One of my favourite watches of last year just got even more delectable
The Zenith Chronomaster Original Triple Calendar is even sweeter in this rose gold case
By Sam Cross
-
New Panerai Submersible Chrono Marina Militare Experience Edition has one feature I wish more watches had
And it comes with a three-day immersive experience
By Sam Cross
-
New Christopher Ward C12 Loco marks the dawn of a new era for the brand
It features a new movement and an open balance
By Sam Cross
-
I loved the Ressence Type 7 at Watches and Wonders – but the real gem has lurked in its catalogue for six years
You've never seen a watch like this
By Sam Cross
-
A Week on the Wrist with the Casio G-Shock 2100 Fine Metallic – classy cool which can survive it all
This classic G-Shock gets a taste of luxury
By Sam Cross
-
One of the best dive watches I tested last year is a bargain with hundreds slashed from the price!
The Seiko Prospex 1965 Diver is a steal for this price
By Sam Cross
-
Blue watches are making a comeback, but not in the shade you might think
Blue dials are my favourite watch trend of 2025 – here’s why
By Bethan Girdler-Maslen
-
Girard-Perregaux Laureato 38 mm gets a blue diamond upgrade
We’re totally besotted by these diamond-bezelled beauties from Girard-Perregaux
By Alistair Charlton