SKX013 Double Domed Sapphire Crystal - Micro Bevel

Name: SKX013 Double Domed Sapphire Crystal - Micro Bevel
Brand: Lucius Atelier
SKU: SKX013-DDSC-DSB
Price: 64.0 SGD
Availability: InStock

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$64 SGD

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The Double Domed Sapphire. Micro Bevel. For the SKX013.

Sapphire sits second only to diamond on the Mohs scale — it shrugs off the scratches a stock crystal collects. This one is cut 28mm for the SKX013: a full double dome that rises 5mm and gives the compact diver real curvature presence.

Both faces curve, with a micro-bevelled edge for a clean line where crystal meets bezel, and it's designed to sit flush with our SKX013 slope bezel inserts. Double-sided anti-reflective coating in blue or clear — at least three layers per face — keeps the dome glare-free.

The vintage dome.
Curvature you can see across the room — clarity you can read up close.

Second to diamond.
Sapphire ranks just under diamond on the Mohs scale — the scratches that dull a stock crystal simply don't land.

Double-sided AR.
Anti-reflective coating on both faces, blue or clear — at least three layers each — so the dome stays glare-free.

Full dome, micro bevel.
A 5mm rise with curves on both faces — the fine bevel keeps the bezel line clean.

Fits the SKX013 family.
SKX013, SKX015, SKX017 and all 7S26-0030 cases. Seats with a crystal press.

Heads up — fit & install

Fits the SKX013, SKX015, SKX017 and all 7S26-0030 cases. Seats with a crystal press — there's no safe press-free way to seat a sapphire; if you don't own a press, a watchmaker or mod specialist fits it in minutes. A crystal gasket is required but not included — the crystal seats with the gasket already in your case. Gaskets are cut to match a specific case, and ours are cut for our cases, so one from us would not seal a stock Seiko case correctly. If the gasket in your case is hardened, cracked or deformed, fit a replacement matched to your case reference — any Seiko parts supplier stocks them. (New gaskets come fitted only with our watch cases.) Designed to sit flush with our SKX013 slope bezel inserts.

New to this? The sapphire crystal install guide walks through it.

Specs
What's Included
Fitment
How To Mod

Specs
1. Quality Swiss Production Quality, ISO 9001 Certified
2. Material Sapphire
3. Crystal Shape Double Domed
4. Crystal Diameter 28mm
5. Crystal Thickness 3.5mm
6. Crystal Dome Height 5mm
7. Cyclops Lens No
8. Anti-Reflective Coating Surface None, Single Side (Underside) or Double Side (Topside and Underside)
9. Anti-Reflective Coating Colour Clear, Blue
10. Tint Clear AR: Colourless. Blue AR: Slightly brown.
11. Optical Distortion None
12. Fit Models SKX013, SKX015, SKX017 and all 7S26-0030 Watch Cases
1. 1x Sapphire Crystal
2. Gasket not included — a crystal gasket is required; your case's existing gasket is reused. Gaskets are cut to match a specific case, so ours ship fitted with our watch cases only; if yours is worn, source a replacement matched to your case reference.
All photos of watches with modification parts are for illustration purposes only and are not included with the sapphire crystal purchase.
Fits the SKX013, SKX015, SKX017 and all 7S26-0030 cases.

Seats with a crystal press — see the install guide under How To Mod.

Pairs with:
1. SKX013 Bezel Inserts (Slope)
2. SKX013 Bezels
1. How To Modify Your SEIKO Watch — Sapphire Crystal
2. Seiko Modding: The Complete Build Guide (2026)

Are sapphire crystals really scratch-proof?

Effectively, yes, for daily wear. Sapphire ranks second only to diamond on the Mohs hardness scale, so keys, desk edges and door frames simply don't leave a mark. Only diamond — or another material approaching its hardness — can scratch it. That's why every crystal we make is sapphire rather than mineral glass.

Flat or double domed — which sapphire should I choose?

Flat is the low-profile, original-style look. Double domed curves on both the top and the underside — it catches light differently across the dial and gives the watch a warmer, vintage character. Neither is tougher than the other; both are sapphire. It's a styling call.

What's the difference between single-sided and double-sided AR coating?

It's which faces carry the anti-reflective layers. Single-sided AR is applied to the underside only; double-sided coats both the topside and underside for maximum clarity — noticeably fewer reflections between you and the dial. Every coated face carries at least three AR layers. Some of our crystals also come uncoated, if you prefer the bare sapphire look.

Blue or clear AR coating — what's the difference?

The colour of the reflection, not the clarity. Clear AR is colourless — reflections just disappear. Blue AR kills glare the same way but flashes a subtle blue at an angle, with a slightly brown tint face-on (a standard characteristic of all blue AR). Both do the same optical job; pick the look you prefer.

Which crystal pairs with slope bezel inserts?

The raised profiles: our high top big bevel flats and double domed micro bevels are designed to sit flush with our slope bezel inserts — the crystal edge meets the insert's incline and the two read as one continuous line. It's an aesthetic pairing, not a fitment rule: any crystal with the right diameter fits the case, whichever insert you run.

Will an SKX007 crystal fit an SKX013?

No — the diameters are different, so they aren't interchangeable. The SKX007 family (7S26-0020, plus SRPD/SRPE) takes a 31.5mm crystal, the SKX013 family (7S26-0030) takes 28mm, and Seiko 5 SNK models take 30mm. Match the crystal to your case and check the Fit Models line in the Specs before ordering.

Do I need a crystal press to install a sapphire crystal?

Yes. A crystal press seats the sapphire straight and evenly — there's no reliable press-free method that doesn't risk cracking the crystal or breaking the water seal. If you don't own a press, a watchmaker or watch-mod specialist can fit it in minutes.

Do sapphire crystals come with a gasket?

No — the crystal ships on its own, with no gasket in the box. You do need a crystal gasket to install it, but in practice that's already sorted: the crystal seats with the gasket that's in your case, so you simply reuse the existing one. We don't sell gaskets separately because a gasket is cut to match one specific case — ours are cut for Lucius Atelier cases, so a gasket from us would not seal a stock Seiko case correctly. New gaskets come fitted only with our watch cases. If the gasket in your case is hardened, cracked or deformed, replace it with one matched to your case reference — any Seiko parts supplier stocks them.