The DOXA SUB 300 Carbon Divingstar makes the familiar cushion-shaped dive watch in a very different way: a black forged-carbon case and bezel frame a bright yellow dial, while a titanium chamber and screw-down caseback sit inside. DOXA lists the 42.5 mm watch at 45 mm long and 13.4 mm thick. Its appeal is the unusual look and the light wrist feel reported by hands-on reviewers; the trade-off is a premium over steel and none of the traditional heft or metallic finish of a steel SUB 300.
What the Carbon Divingstar is
This is the yellow-dial carbon version of the SUB 300, reference 822.70.361.31—not the steel SUB 300 Divingstar and not the SUB 300T. DOXA’s official product page specifies a forged-carbon case and bezel, a titanium chamber, and a screw-down caseback. The product description also calls out a domed, anti-reflective sapphire crystal.
Forged carbon gives the case a patterned black appearance rather than the uniform metallic surface of steel. The contrast makes the yellow dial the visual focus. Fratello reviewer Balazs Ferenczi noted that the yellow worked well with the black indexes and hands in his own assessment; that is a subjective impression, not a guarantee that the color combination will suit every buyer.
Does it wear too big?
DOXA lists the case at 42.50 mm in diameter, 45.00 mm in length, and 13.40 mm in height. The cushion shape gives it a broad presence, but the 45 mm length is useful context alongside the diameter when estimating how it may sit on a wrist. Dimensions alone cannot predict fit: wrist shape, strap adjustment, and personal preference all matter.
#1 Best Overall
- LIMITED-EDITION DIVE WATCH WITH PREMIUM MATERIALS - The Aquadeep Submerge Carbon elevates the Aquadeep platform with premium materials and limited-edition exclusivity. Developed for enthusiasts seeking a more distinctive and collectible timepiece, it blends professional dive-watch functionality with contemporary design and advanced material technology.
- FORGED CARBON FIBER DIAL WITH HIGH-VISIBILITY DETAILS - At the center of the Submerge Carbon is a forged carbon fiber dial that creates a naturally layered texture unique to each watch. Paired with bright yellow accents for enhanced readability, the dial offers a bold and technical appearance inspired by modern performance equipment.
- NH37 AUTOMATIC MOVEMENT FOR MODERN MECHANICAL PERFORMANCE - The Aquadeep Submerge Carbon is powered by the Japanese NH37 automatic movement, providing dependable self-winding operation and consistent performance. Designed for mechanical watch enthusiasts, it combines reliability with the enduring appeal of an automatic movement.
- TITANIUM CASE WITH CARBON BEZEL TECHNOLOGY - Combining a DLC-coated titanium case with a carbon bezel, the Submerge Carbon showcases a more advanced material package than the standard Aquadeep. The lightweight construction enhances comfort while reinforcing the watch's modern, performance-oriented character.
- PREMIUM COLLECTOR'S DIVE WATCH DESIGN - With 300 meters of water resistance, the Submerge Carbon is built for real-world diving while emphasizing exclusivity, modern materials, and distinctive aesthetics. Rather than focusing on a higher depth rating, it differentiates itself through forged carbon construction, limited-edition status, and a more premium overall execution.
Hands-on accounts describe the watch as notably light and comfortable. Time and Watches reported a weight of 87 g (3.06 oz) for a tested SUB 300 Carbon in its 2021 review, which included Caribbean and Divingstar versions. That is the publication’s reported measurement, not a weight listed on DOXA’s product page, and it should not be assumed to apply to every configuration. Ferenczi also described an exceptionally light, comfortable feel during his own wear and travel. He summed up the practical question with: “You need to see and feel it on your wrist.”
If you are concerned that 42.5 mm will feel too large, try it on if possible. The compact-looking case length may help, while the broad cushion form remains noticeable; the reported lightness changes how it feels, not its physical dimensions.
Rank #2
- 𝗛𝗘𝗔𝗩𝗬 𝗗𝗨𝗧𝗬, 𝗛𝗜𝗚𝗛 𝗣𝗘𝗥𝗙𝗢𝗥𝗠𝗔𝗡𝗖𝗘 𝗗𝗜𝗩𝗘 𝗪𝗔𝗧𝗖𝗛: Built for diving enthusiasts, this high-performance watch is designed to withstand depths of up to 500 meters, making it ideal for high-impact water sports, scuba diving, and saturation diving.
- 𝗘𝗫𝗖𝗘𝗣𝗧𝗜𝗢𝗡𝗔𝗟 𝗟𝗜𝗚𝗛𝗧𝗪𝗘𝗜𝗚𝗛𝗧 𝗗𝗨𝗥𝗔𝗕𝗜𝗟𝗜𝗧𝗬: Crafted from Grade II Titanium with a sandblasted finish, our timepiece is 40% lighter than steel, offering ultimate comfort without compromising on durability. Hypoallergenic and highly resistant to corrosion from sea water and chlorine, it's built to withstand the toughest conditions while maintaining its sleek appearance.
- 𝗨𝗡𝗠𝗔𝗧𝗖𝗛𝗘𝗗 𝗖𝗟𝗔𝗥𝗜𝗧𝗬 & 𝗥𝗘𝗔𝗗𝗔𝗕𝗜𝗟𝗜𝗧𝗬 𝗢𝗙 𝗧𝗜𝗠𝗘: Experience unparalleled clarity and readability with our double dome sapphire crystal glass. No matter the angle, this feature ensures that time is easily readable, allowing you to stay on track with confidence and precision.
- 𝗨𝗟𝗧𝗜𝗠𝗔𝗧𝗘 𝗖𝗢𝗠𝗙𝗢𝗥𝗧 𝗢𝗡 𝗬𝗢𝗨𝗥 𝗪𝗥𝗜𝗦𝗧: Our timepiece comes with a rubber strap designed for unparalleled comfort, flexibility, and adaptability to your wrist's contours. Perfect for individuals leading active lifestyles or seeking all-day comfort, it ensures a snug and pleasant fit every time.
- 𝗥𝗘𝗡𝗢𝗪𝗡𝗘𝗗 𝗕𝗥𝗔𝗡𝗗 𝗔𝗡𝗗 𝗖𝗢𝗟𝗟𝗘𝗖𝗧𝗜𝗢𝗡: As part of the esteemed UNDONE brand, the Aquadeep Submerge belongs to a collection designed for serious divers and underwater enthusiasts.
What the specification offers
| Feature | DOXA specification or published report |
|---|---|
| Reference | 822.70.361.31 — DOXA |
| Case and bezel | Forged carbon; titanium chamber and screw-down caseback — DOXA |
| Dimensions | 42.50 mm diameter × 45.00 mm length × 13.40 mm height — DOXA |
| Crystal | Domed, anti-reflective sapphire — DOXA product description |
| Movement | Automatic, self-winding, COSC-certified chronometer; 28,800 vph; 38-hour power reserve — manufacturer specifications |
| Functions | Hours, minutes, seconds, and date — DOXA |
| Bezel and water resistance | Unidirectional carbon bezel with meter markings; 30 ATM / 300 m / 984 ft stated water resistance — DOXA |
| Crown | Screw-down — DOXA |
| Strap and clasp | FKM rubber strap, folding clasp with black PVD coating, and ratcheting wetsuit extension — DOXA |
| Lug width | 20 mm — DOXA |
| Weight | 87 g / 3.06 oz reported for a tested watch by Time and Watches in 2021; not stated on DOXA’s product page |
The 300 m figure is DOXA’s stated rating, not a test conducted for this review. The brand specifies a screw-down crown and a unidirectional bezel with a meter scale; the table records the maker’s specifications rather than independent verification.
Carbon Divingstar versus the steel SUB 300 Divingstar
The closest comparison is the steel SUB 300 Divingstar. DOXA lists that model with a 42.5 mm steel case and options for a rubber strap or a beads-of-rice bracelet. Its official product page is the place to check current configurations. The main choice is not simply color: it is a patterned, light-feeling carbon watch on rubber versus a conventional metal case with a bracelet option.
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- Unique Carbon Fiber Dial: Each dial is crafted from carbon fiber, ensuring a unique, pattern exclusive to your watch. This high-tech material adds a distinctive style for both underwater missions and surface-level sophistication
- Rugged Style: Featuring an angular, multi-faceted case, this watch delivers a tough tool-watch aesthetic built for demanding environments. Its robust construction is ideal for professional diving, underwater exploration, and outdoor adventures
- Premium Materials: With accurate 9015 automatic movement, BGW9 lume, sapphire crystal, screw-down crown and case back, 316L stainless steel. Its robust construction handles extended diving, sailing, and harsh conditions with lasting reliability
- Lume & Waterproof: 200m water resistance meets BGW9 super-lume for true dive readiness. This combination ensures clear visibility in deep or murky water and reliability during extended underwater exploration
- Dimensions: Featuring a 11.5 mm thin profile, 6.5 mm crown, 40 mm case, 45.8 mm lugs to lugs, and total weight of 144 g, 220 mm in total length with 20 mm lug width, fitting wrists 6"–8.5"
| Consideration | SUB 300 Carbon Divingstar | Steel SUB 300 Divingstar |
|---|---|---|
| Case character | Black forged carbon with a patterned appearance | Steel with a conventional metallic finish |
| Wear feel | Reviewers describe a notably light feel; Time and Watches reported 87 g / 3.06 oz for its tested watch in 2021 | Steel has a different, more substantial feel; no directly comparable weight is stated here |
| Listed case diameter | 42.5 mm — DOXA | 42.5 mm — DOXA |
| Strap or bracelet options | Rubber strap listed by DOXA | Rubber strap or beads-of-rice bracelet listed by DOXA |
Price comparisons need to be made within the same market and at the same time. DOXA’s regional listings showed USD 4,390 on the US page and EUR 4,190 on the European page on October 8, 2026; these are different markets, not exchange-rate equivalents or universal prices. For historical context only, Fratello reported a 2021 launch-era carbon price of EUR 3,790 and described steel models as around EUR 2,500 depending on configuration. Those dated euro figures should not be treated as current offers or used to calculate today’s premium.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who should consider it?
- Choose the Carbon Divingstar if you want the black forged-carbon pattern, the high-contrast yellow dial, and a lighter-wearing take on the SUB 300 design.
- Look closely at the steel model if you prefer a metallic finish, want the option of a beads-of-rice bracelet, or value the more traditional heft of a steel watch.
- Try either version on if case shape and wrist fit are decisive. The listed diameter is the same, but the material and available configurations change the wearing experience.
The Carbon Divingstar is a distinctive alternative rather than a straightforward upgrade for every SUB 300 buyer. Its case material and reported lightness are meaningful differences, but the premium only makes sense if those qualities matter more to you than steel’s familiar finish and bracelet choice. Check DOXA’s regional listing for the price and configuration available where you live.
Quick Recap
Best Value
- Carbonox+
- Sapphire Crystal
- 316L Stainless Steel Back
- Swiss Automatic - SELLITA SW220-1
Rank #4
- Self-winding automatic movement - an Eco-friendly choice for discerning customer. Powered by everyday movement of your arm
- Automatic self-winding movement with analog display and sapphire crystal dial window
- Date calendar, water-resistant, luminous, chronograph
- Black rubber carbon fiber case with black dial
- Water resistant to 50 ATM / 500 meters / 1650 feet : suitable for professional marine activity serious surface water sports and skin diving
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
