Casio’s July 9, 2025 U.S. announcement introduced two Kurogane-Iro MR-G G-SHOCK references: the MRGB2000BG-3A with a dark green DLC titanium bracelet and the MRGB2000RG3A with a Dura Soft fluoro-rubber strap. Both use a deep blue-green finish inspired by heated iron associated with traditional Japanese armor. Casio announced a U.S. launch price of $3,300 for each; that is a dated launch figure, not a verified current price or availability.
Which Kurogane-Iro MR-G models did Casio announce?
Casio America announced the pair on July 9, 2025. Their shared design theme and color are similar, but the band material—and the exact reference—distinguish them.
| Model | Band | U.S. launch detail |
|---|---|---|
| MRGB2000BG-3A | Solid titanium bracelet with dark green DLC finish | $3,300 announced launch price; Casio said it would be available July 9, 2025, at select jewelers, gshock.com, and the G-SHOCK Soho store |
| MRGB2000RG3A | Dura Soft fluoro-rubber strap | $3,300 announced launch price; Casio said it would be available July 9, 2025, at select jewelers, gshock.com, and the G-SHOCK Soho store |
Those prices and sales channels describe Casio America’s 2025 announcement only. They do not establish what either reference costs or where it is currently in stock.
What does Kurogane-Iro mean in this design?
Casio describes Kurogane-Iro as the deep blue-green shade iron takes on when heated for traditional Japanese armor and helmets. On the MRG-B2000BG-3A, Casio applies green DLC coating and deep-layer hardening to the titanium exterior. The result is a contemporary treatment of an armor-associated color, rather than a claim that the watch itself uses traditional armor-making materials.
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The dial details extend the Japanese design references: Casio says the edge evokes a folding fan or screen, while the indexes echo the curve of Japanese swords. The overall effect is samurai-inspired, expressed through the finish and shapes rather than a literal replica of a sword or helmet.
What are the MRG-B2000BG-3A’s specifications?
Casio’s official product page lists these manufacturer specifications for the bracelet model. They are not independent test results.
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- Smartphone Link Functions; Battery Level Indicator; New Layer Guard Structure; Tough Solar; Dual Dial World Time; Chronograph
- 200 Meter Water Resistance; Shock Resistance; Neobrite; Bluetooth Capability
- Quartz Movement
- Case Diameter: 53.8mm
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
| Specification | Casio-listed detail |
|---|---|
| Case size | 54.7 × 49.8 × 16.9 mm |
| Weight | 150 g |
| Case and bezel | Titanium |
| Band | Solid titanium; tight-lock, one-press, three-fold clasp |
| Construction | Shock resistant and magnetic resistant |
| Water resistance | 200 meters (20 bar) |
| Time adjustment | Bluetooth smartphone connection and Multi Band 6 radio control |
| Power and display | Solar power; Super Illuminator LED |
| Crystal | Sapphire crystal with anti-reflective coating |
Connected functions
Casio lists the CASIO WATCHES app with automatic time adjustment, easy settings, world time for approximately 300 cities, watch status display, self-check, and phone finder. The watch combines Bluetooth linking with Multi Band 6 radio control; the product page does not make these functions evidence of a mechanical movement.
Size and wear
At 54.7 mm across its listed case dimensions and 150 g, the bracelet reference is a substantial watch. Those figures are specifically for the MRG-B2000BG-3A; the official information cited here does not establish dimensions or weight for the rubber-strap MRGB2000RG3A. Choose between the references primarily by band preference: a full titanium bracelet or a fluoro-rubber strap.
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- Smartphone Link Functions; Battery Level Indicator; New Layer Guard structure; Tough Solar; Dual Dial World Time
- 200 M Water Resistance; One-Touch 3-Fold Clasp; Chronograph; Neobrite
- Quartz Movement
- Case Diameter: 53.8mm
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
How does the Kurogane-Iro pair relate to other katana-inspired MR-Gs?
Casio has used sword and armor references across different MR-G releases, but those watches are separate models with distinct design stories. They should not be confused with the two July 2025 Kurogane-Iro references.
| Reference | Design element and materials described by Casio | Release or edition detail |
|---|---|---|
| MRG-B2000JS | Inspired by the commissioned Juryoku-Maru: San katana; hybrid titanium bezel combines Ti64 and pure titanium and is processed to evoke the sword’s temper pattern. The band draws on the blue shell-lacquer scabbard design. | Announced October 24, 2024; separate from the Kurogane-Iro pair |
| MRG-B2000KT | Katana-guard-inspired design; titanium bezel hand-engraved with a phoenix by metalsmith KOBAYASHI Masao, with a dark blue-green Kurogane-Iro hue and green DLC | Casio states an edition of 800 worldwide; this is not an edition-size claim for the 2025 pair |
The MRG-B2000KT shows that Kurogane-Iro appears on another MR-G design, while the MRG-B2000JS draws on a specific katana and its scabbard. Their materials, release details, and edition information do not transfer to the BG-3A or RG3A.
Quick Recap
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- MUDMASTER Built for Extreme Environments – Rugged construction is engineered to resist mud, dust, shock, dirt, and debris, making the GG1000-1A5 ready for demanding outdoor conditions.
- Twin Sensor Compass & Thermometer – Built-in digital compass measures direction across 16 points and 0° to 359°, while the thermometer measures temperatures from 14°F to 140°F (-10°C to 60°C).
- Shock Resistant & 200M Water Resistant – Legendary G-SHOCK toughness combines shock-resistant construction with 200-meter water resistance for dependable performance during outdoor adventures and demanding work.
- Super Illuminator LED Backlight – High-brightness white LED backlight features an auto light switch, selectable 1.5- or 3-second illumination, and afterglow for improved visibility in low-light environments.
- World Time & Advanced Timekeeping – Includes world time across 31 time zones and 48 cities, a 1/100-second stopwatch, 60-minute countdown timer, 5 daily alarms, snooze alarm, and full auto-calendar through 2099.
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- Shock Resistant, 200 Meter Water Resistant, Magnetic Resistant
- Auto LED Light with Afterglow, World Time, 4 Daily Alarms and 1 Snooze Alarm
- Hourly Time Signal, Countdown Timer, Full auto-calendar (pre-programmed until the year 2099)
- 12/24 Hour Formats, Accuracy: +/- 15 seconds per month, Battery: CR1220
- Approx. battery life: 3 years, Module 5229, Size of case/total weight: 55.0 x 51.2 x 16.9mm / 73g
What should buyers verify before choosing one?
- Confirm the full reference: MRGB2000BG-3A is the titanium-bracelet version; MRGB2000RG3A is the fluoro-rubber-strap version.
- Check current regional listings for price, stock, and seller status. Casio’s $3,300 figure and named sales channels were U.S. launch details from July 2025, not a current retail quote.
- Use the BG-3A’s published size and weight as a fit consideration if you are sensitive to large or heavy watches; do not assume those measurements apply to the RG3A.
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.
