Diamond 44M
| LOA 44.06 m | |
| Beam 9.16 m, draft approximately 2.31 m | |
| Gross tonnage 471 GT, full-load displacement around 340 tonnes | |
| Hull GRP (fibreglass) | |
| Guests up to 10 in 5 suites, crew 8 | |
| Exterior design Giorgio M. Cassetta | |
| Twin MAN V12 diesels (1,400 hp each), top speed around 15 knots | |
| Sun deck reported at around 102 sq m, Class 44M is the successor model |
Benetti's flagship in composite
The Diamond 44M sits at the top of Benetti's fibreglass range, the point where the composite line reaches towards custom-yacht scale. At just over 44 metres it delivers volume and presence usually associated with metal builds while keeping the efficiency of a series product. The model became one of the yard's steady sellers, with multiple hulls launched in quick succession. It proved there was strong demand for a large composite Benetti. Benetti built it in a steady series, which helped keep delivery times and pricing predictable.
The design also showed how far the yard could push GRP construction in terms of size and volume. Its 471 GT are substantial for a fibreglass yacht. That combination of scale and series pricing gave the Diamond a clear place in the market. It became a reference point for buyers weighing composite against steel at this length. For many buyers that predictability matters as much as the volume itself.
Cassetta's classical hand
Giorgio M. Cassetta styled the exterior, giving the Diamond a poised, fairly classical profile in place of an aggressive one. Hand-finished detailing and clean bridge structures lend the boat a considered, timeless look. The proportions read as elegant and balanced across the three decks. It is a design meant to age gracefully rather than chase a trend. The three-deck profile reads as calm and confident from any angle.
The headline exterior space is the sun deck, reported at around 102 square metres, which the yard describes as the largest in its size category. That deck gives owners a vast area for dining and entertaining under the sky. The rest of the outdoor spaces are generous in keeping with the boat's volume. Cassetta's styling ties it all together with restraint. It gives owners a genuine outdoor room high on the boat.
Benetti's largest composite yacht brings metal-build volume to a fibreglass hull.
Volume for ten guests
The Diamond 44M accommodates up to 10 guests across five suites, with room for eight crew in five cabins. The interior benefits from the boat's beam of 9.16 metres, which opens up wide saloons and generous cabins. Owners can tailor the interior within the semi-custom framework to suit their taste. The volume on offer is a core part of the appeal. That beam is a big part of why the boat feels larger inside than its length suggests.
The layout follows a conventional tri-deck logic that owners and crew know well, which aids both living aboard and resale. Main-deck social space is ample, with private owner accommodation set apart. The finish meets the yard's established standard for the range. It is a practical, spacious interior in place of an experimental one. Crew areas are sized to run the boat properly on longer trips and charters.
GRP at flagship scale
The Diamond is built in fibreglass, riding on a displacement hull of 44.06 metres with a 9.16-metre beam and a draft near 2.31 metres. Twin MAN V12 diesels of 1,400 hp each give a top speed around 15 knots and an economical cruise near 11 knots. Full-load displacement is around 340 tonnes. The boat is tuned for comfortable, efficient passage-making rather than speed. The modest cruising speed reflects a design built for range and comfort over pace.
Building a yacht of this volume in composite is itself the engineering story, requiring careful structural work to keep weight and stiffness in balance. Fuel and water capacities support extended cruising between ports. The systems follow proven Benetti semi-custom practice. Reliability and repeatability were clearly priorities in the design.
Who the Diamond 44M suits
The Diamond 44M suits an owner who wants large-yacht volume and a big sun deck without moving to a full-custom steel build. It offers series-build reassurance and a known cost base at a generous size. The classical Cassetta styling appeals to buyers who prefer elegance to edge. It works for both private use and charter. Charter operators have valued the deck space and guest volume the model provides.
In the market the Diamond competed with other 40-metre-plus semi-custom yachts, where its volume and deck space stood out. Benetti has since introduced the Class 44M on the same hull, with Cassetta again on the exterior, which points to the platform's staying power. A healthy number of Diamond hulls now exist, giving buyers brokerage options. For volume-focused owners, it remains a strong case. The arrival of the Class 44M underlines how well the base design has held up.
Engines and systems
| Engines | Twin MAN V12-1400 diesels, 1,400 hp (1,029 kW) each at 2,300 rpm. |
|---|---|
| Fuel and water | Approximately 60,000 litres (15,850 US gal) fuel; approximately 8,000 litres (2,113 US gal) fresh water, per broker-published specification. |
| Hull and tonnage | GRP composite hull, 44.06m LOA, 9.04m beam; gross tonnage quoted as 471 GT (Benetti) or 456 GT (broker spec sheet) - the two published figures do not agree. |
| Draught and displacement | 2.3m draught; full-load displacement approximately 362 tonnes (798,072 lb). |
| Design | Exterior by Giorgio M. Cassetta; interior by Achille Salvagni; naval architecture in-house at Benetti. |
| Generators, stabilisers, thrusters, watermaker | Not published in any source found for this page. |
What owners and crew report
A real series with at least six hulls delivered, but no first-hand account surfaced
Boat International's own launch coverage tracks the Diamond 44M through at least a sixth hull built at Viareggio, so this is not a one-off - yet no named owner, captain or charter-guest account of actually living aboard one turned up in this research, only launch reporting, brokerage specification pages and the yard's own material.
Yotters research desk
What is good, and what to watch
Strong points
- A proven platform, not a first-of-type gambleAt least six hulls were built between 2020 and 2024, an unusually long run for a semi-custom composite yacht this size, and it won 'Most Innovative Yacht (30-50m)' at the 2020 World Yachts Trophies on the first hull.
- Real numbers behind the volume claim471 GT (Benetti's own figure; a broker spec sheet for one hull states 456 GT) on a 44-metre composite hull is genuinely large for fibreglass construction, and the roughly 102 sqm sun deck is a real, usable outdoor room, not a marketing line.
- A resale market that already existsMultiple hulls are in circulation on the brokerage market now that the Class 44M has taken over as Benetti's current composite flagship, which gives a buyer real comparables and real liquidity that a brand-new model cannot offer.
What to watch
- Discontinued, not currentBenetti stopped building the Diamond 44M in 2024 and replaced it on the same platform with the Class 44M; anyone buying now is buying a superseded generation, with whatever gap that implies against the newer model's updates.
- Composite, not steel, at a length where buyers often expect steelAt 44 metres many rivals of similar size are steel-hulled; the Diamond's GRP construction is exactly what makes the series pricing and delivery times possible, but a buyer who equates hull material with prestige should weigh that trade-off consciously.
- A minor published-figure mismatch worth checking with a brokerBenetti's own material and at least one brokerage spec sheet quote 471 GT against 456 GT for gross tonnage - not a large gap, but the kind of number a serious buyer should confirm against the specific hull's own tonnage certificate rather than either published figure.
Practical detail
| New price (as launched) | Approximately EUR 24.0 million, per broker-published pricing at launch - not a Benetti-quoted figure. |
|---|---|
| Production run | Built 2018-2024, at least six hulls delivered; succeeded by the Benetti Class 44M on the same platform. |
| Range and speed | 3,800nm at 11 knots; 14 knots cruise; 15 knots top speed. |
| Guests and crew | 10 guests in 5 cabins (1 master, 2 VIP, 2 twin); 7 crew in 5 cabins. |
| What is not published | No independent sea-trial or owner account was found; gross tonnage is quoted differently across sources (471 GT vs 456 GT) and should be confirmed hull-by-hull. |
Questions owners ask
How big is the Benetti Diamond 44M?
LOA 44.06 m. Beam 9.16 m, draft approximately 2.31 m.
Who is the Benetti Diamond 44M for?
An owner who wants large tri-deck volume and a standout sun deck in an efficient composite semi-custom package rather than a custom steel build.
What is the Benetti Diamond 44M good at?
A proven platform, not a first-of-type gamble. At least six hulls were built between 2020 and 2024, an unusually long run for a semi-custom composite yacht this size, and it won 'Most Innovative Yacht (30-50m)' at the 2020 World Yachts Trophies on the first hull.
What are the drawbacks of the Benetti Diamond 44M?
Discontinued, not current. Benetti stopped building the Diamond 44M in 2024 and replaced it on the same platform with the Class 44M; anyone buying now is buying a superseded generation, with whatever gap that implies against the newer model's updates.
What do owners and crew report about the Benetti Diamond 44M?
Boat International's own launch coverage tracks the Diamond 44M through at least a sixth hull built at Viareggio, so this is not a one-off - yet no named owner, captain or charter-guest account of actually living aboard one turned up in this research, only launch reporting, brokerage specification pages and the yard's own material. (Yotters research desk)
Design
| Exterior | Giorgio M. Cassetta (Cassetta Yacht Designers) |
|---|---|
| Interior | Cassetta Yacht Designers (model design, individual hulls custom, e.g. 'INK' by Achille Salvagni) |
| Naval architecture | Pierluigi Ausonio with Benetti |
Who it is for: An owner who wants large tri-deck volume and a standout sun deck in an efficient composite semi-custom package rather than a custom steel build.