The Ceramic 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 black ceramic (zirconia, zro2) case. It measures 43.0 mm across, and is water resistant to 300 m. Inside is the L888.3 (ETA A31-L01 base) automatic, 25,200 vph movement, with 72 hours power reserve. Complications: Date. Priced from $4,700. Brand origin: Switzerland.

Ceramic diver watchesBlack ceramicDiversUnder $5,000
Reference
L3.784.4.56.9
Type
Diver
Price
$4,700
Case diameter
43.0 mm
Thickness
Lug-to-lug
Water resistance
300 m
Weight
Origin
Switzerland
Movement
Automatic, 25,200 vph
Caliber
L888.3 (ETA A31-L01 base)
Power reserve
72 hours
Complications
Date
Ceramic
Black ceramic (zirconia, ZrO2)
Colour
Black
Hardness
Construction
Monobloc
Surface treatment
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
Ceramic bracelet
Crystal
Sapphire
Display back
No
Dial
Matte black with applied indices
Lume
Super-LumiNova
Availability
Offered
Status
Current
Medium confidence Verified Jul 2026 Source: Longines (maker) / Monochrome hands-on / aBlogtoWatch hands-on Maker / listing ↗
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Frequently asked questions

What kind of ceramic is the Longines HydroConquest Full Black Ceramic?

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

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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