The Wristwatch Field Guide

Longines HydroConquest Full Black Ceramic

L3.784.4.56.9

The Longines HydroConquest Full Black Ceramic is a current-production diver watch with a black ceramic (zirconia, zro2) case. It is priced well above the $1,199 median for the category.

All Longines watchesExotic-material diver watchesCeramicBlackDiversUnder $5,000
Price
$4,700
Material
Ceramic
Grade / type
Black ceramic (zirconia, ZrO2)
Water resistance
300 m
Reference
L3.784.4.56.9
Type
Diver
Case diameter
43.0 mm
Origin
Switzerland
Movement
Automatic, 25,200 vph
Caliber
L888.3 (ETA A31-L01 base)
Power reserve
72 hours
Complications
Date
Colour
Black
Construction
Monobloc
Caseback
Ceramic
Nickel-free
Not verified (bracelet, strap, or clasp hardware not confirmed)
Bracelet / strap
Black rubber strap with a ceramic double-safety folding clasp
Crystal
Sapphire
Display back
No
Dial
Matte black with applied indices
Dial colours
Black
Lume
Super-LumiNova
Availability
Offered
Status
Current
Not published
Thickness, Lug-to-lug, Weight, Hardness, Surface treatment, Matching bracelet
Medium confidence Verified Jul 2026 Source: Longines (maker) / Monochrome hands-on / aBlogtoWatch hands-on
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Alternatives to the Longines HydroConquest Full Black Ceramic

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Bell & RossBR 03-92 Diver Green Bronze$4,90042.0 mmDiversame category · same style · shared complications · similar price
TAG HeuerAquaracer Professional 300 Date Titanium (green)$4,95043.0 mmDiversame category · same style · shared complications · similar priceBell & Ross BR 03-92 Diver White BronzeBell & RossBR 03-92 Diver White Bronze$4,99042.0 mmDiversame category · same style · shared complications · similar priceBell & Ross BR 03-92 Diver Red BronzeBell & RossBR 03-92 Diver Red Bronze$5,00042.0 mmDiversame category · same style · shared complications · similar price

More exotic-material watches from Longines

LonginesSpirit Zulu Time Titanium 39mm$3,50039.0 mm69 gPilot
LonginesSpirit Flyback Titanium 42mm$5,90042.0 mm17 mm thickPilot
LonginesSpirit Titanium 42mm$3,70042.0 mmPilot
LonginesSpirit Titanium 40mm$3,50040.0 mmPilot
LonginesAvigation BigEye Titanium 41mm$4,40041.0 mm14.5 mm thickPilot
LonginesPilot Majetek Pioneer Edition (Titanium)$5,65043.0 mm13.3 mm thick78.7 gPilot

Frequently asked questions

What is the case material of the Longines HydroConquest Full Black Ceramic?

The Longines HydroConquest Full Black Ceramic has a black ceramic (zirconia, zro2) case with a ceramic caseback. It is recorded at medium confidence pending a maker-stated material.

What size is the Longines HydroConquest Full Black Ceramic?

It is 43.0 mm in diameter, and water resistant to 300 m.

How much does the Longines HydroConquest Full Black Ceramic cost, and is it available?

It is current-production and lists from $4,700.

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