Best dive watches with sapphire crystal

The deepest rating on this site in one of its smallest dive cases: 300m, sapphire and a 72-hour 6R55 with a published +25/-15 seconds a day, at 40mm and 46.4mm lug-to-lug.

Seiko's three-year warranty and a published $296 overhaul make it the most plannable dive watch here to own.

300m and a 46.4mm lug-to-lug in the same watch is unusual. The extender in the clasp is the detail that says Seiko still expects this one to be dived, not just worn.

Sapphire at a level where Seiko still fits Hardlex, with 200m, a screw-down crown and Orient's in-house F6922 — hand-winding and hacking — plus a three-year warranty.

41.8mm and 46.8mm lug-to-lug, on a 22mm strap.

On paper this is the best value in the category and it is not close: sapphire and a hacking, hand-windable in-house caliber at a price where Seiko still fits Hardlex. Orient's three-year warranty is longer than Hamilton's or Tissot's.

Sapphire twice — a double-domed crystal and a 24-hour bezel insert — on a 200m case with a screwed crown, around Miyota's 9075, which Baltic describes as a true GMT.

13.8mm thick. Sold direct; we earn nothing on this link.

Baltic states the Miyota 9075 is a true GMT — the local hour hand jumps independently — which is rare at this level. Add a double-domed sapphire crystal, a sapphire 24-hour bezel, a screwed crown and 200m in a 39.5mm case. Sold direct; we earn nothing on it.

Sapphire, a screw-lock crown and 18 ATM, with a two-year international warranty stated on Spinnaker's own page.

15mm thick and 50mm across the lugs, and Spinnaker does not name the caliber. Check it against your wrist before you buy.

Sapphire and a stated two-year warranty at this price is a good trade. 15mm thick and 50mm across the lugs is not — this is a big watch, and the spec sheet says so plainly.

The three-hand Aquascaphe: a sapphire bezel insert that neither fades like aluminum nor chips like ceramic, on a 39mm, 200m case with a 47mm lug-to-lug.

Baltic states no warranty term on the page we read. Sold direct.

The sapphire bezel insert is the part that matters for keeping: aluminum inserts fade and ceramic chips, and this does neither. Baltic sells direct, so there is no buy button here from us.

Titanium, sapphire and 200m at 38mm with a 44mm lug-to-lug — a 200m case for a wrist nothing else on this list fits.

BOLDR states no warranty term on the product page; the NH38A inside is a movement every independent watchmaker knows. Sold direct.

The NH38A is the movement every independent watchmaker already knows, which is the whole serviceability argument in one line. A 44mm lug-to-lug on a 38mm case is about as wearable as a 200m watch gets.