Rolex GMT-Master II
at RRP level
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ℹ️ 1-month trend
Price change over the past 30 days. Shows the short-term market movement — relevant if you want to buy or sell soon.
ℹ️ 4-month trend
The central metric behind the momentum score. It filters out short-term swings and shows the true, medium-term market trend of this reference.
ℹ️ Volatility
Annualised price fluctuation. Below 10 % = very stable, 10–20 % = normal, above 20 % = volatile. With high volatility the price can change quickly — in both directions. Be cautious about buying without checking the current price.
ℹ️ Momentum score
ChronoCheck's own indicator from 0 to 100, calculated from the 4-month trend, volatility and market direction.
- Above 60 — Upward trend. Good time to sell, prices are rising.
- 40 – 60 — Neutral. Stable price level, no pressure to act.
- Below 40 — Downward trend. Wait or enter at a good price.
ℹ️ Investment Grade A/B/C/D
ChronoCheck's own rating for each reference. A 0–100 point scale, made up of four weighted components:
- Momentum (40 pts) — trend strength from the momentum score.
- Liquidity (25 pts) — number of active live listings.
- Stability (20 pts) — inverse volatility — the calmer, the better.
- Source robustness (15 pts) — number of independent market sources.
- A · 75+ Trend is right, liquidity good, data broad.
- B · 55–74 Solid, but one component weaker.
- C · 35–54 Average, volatility or market breadth weigh on it.
- D · below 35 Downward or too little data — a collector's piece.
Not investment advice. Pure data analysis from aggregated market sources.
What if you had bought back then …
What would a purchase at the median market price back then have become — at today's level of $24,429. A pure return calculation, excluding insurance, servicing and transaction costs.
Data from an aggregated median time series (watch_market_daily). CAGR = Compound Annual Growth Rate, normalized to 365 days. Not an investment recommendation.
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Technical data
Lift angle 52° — important for timing-machine diagnosis: with this value a watchmaker can correctly measure rate deviation, amplitude and beat error. ChronoCheck verifies such technical details directly from the manufacturers' factory specifications.
Rolex Ref. 126713GRNR — Variants and collector names
Known as: Zombie, Bumblebee
Movement variants
- 3285 (2023–today) · 28800 bph
Bezel variants
- 126713GRNR Grey-Black Cerachrom GMT Bezel – Yellow Gold Inlay "Zombie Bezel"
Dial variants
- 126713GRNR-Black-Lacquer-Chromalight-YG — ROLEX (crown) / OYSTER PERPETUAL / GMT-MASTER II / SUPERLATIVE CHRONOMETER / OFFICIALLY CERTIFIED; applied 18k yellow gold stick indices and hour numerals
Crystal variants
- Saphir-Cyclops
Bracelet variants
- Jubilee Rolesor Ref. Jubilee-Gold-Steel
Serial numbers
- ? – ? (2023–?) — Since 2010, Rolex has used fully randomized serial numbers with no correlation to production year. Dating based on the serial number alone is not possible. The serial number is engraved on the rehaut at 6 o'clock. Dating is only possible via Box & Papers.
Since 2022, Rolex has been producing reference 126713GRNR, a GMT-Master II in steel and yellow gold with the grey-and-black Cerachrom bezel that glows fiercely under UV light. That effect is exactly what gave rise to two nicknames in the community. Zombie describes the ceramic itself, which turns a sickly yellow-green under black light. Bumblebee refers to the combination of grey-black and the 18-karat yellow-gold inlay on the 24-hour scale, which reads like bee stripes in daylight. Two names, one and the same bezel code: Grey-Black Cerachrom GMT Bezel with Yellow-Gold Inlay.
## The Dial Carries the Caliber's Signature
Beneath the sapphire crystal sits a black lacquer dial with Chromalight luminescent material and yellow-gold hour markers, listed internally by Rolex as 126713GRNR-Black-Lacquer-Chromalight-YG. Power comes from the Caliber 3285, the standard movement across the GMT-Master II family since 2018, fitted with a Chronergy escapement and 70 hours of power reserve. That's enough to cover a full weekend without ever having to touch the crown.
## On the Wrist, the Reference Is Unmistakable
40 millimeters in case diameter, a Rolesor build in 904L steel and 18-karat yellow gold, plus a bezel no other Rolex model wears in quite the same way. In my workshop, I rarely see the 126713GRNR twice under the same lighting, since customers reach for their phone flashlight almost on reflex the moment the name Zombie comes up. That instant recognizability is exactly what's driving the current demand pressure among dealers and on the grey market.
Brand profile: Rolex
Rolex is the most counterfeited watch brand in the world. Super-clones (VSF, ARF, Clean — the latter inactive since a 07/2025 raid, only old stock remains) reach 95%+ similarity. Authenticity is almost always only identifiable through micro-details and caliber behavior.
- Case back: ALWAYS solid and closed — any viewing window means definitely fake (exception: vintage Ref. 6085 only)
- Minute hand length: genuine Rolex minute hands end EXACTLY at the minute chapter ring. 1 mm too long = fake. The strongest VSF tell.
- Seconds hand: smooth sweep without any hesitation — the slightest tick-tock means fake
- Cyclops lens (on Date models): must magnify exactly 2.5×, the date should nearly fill the entire window
Serial number format: Since 2010, a random alphanumeric combination (e.g. 'G3M9K721'). 2000-2010: a letter plus 6-7 digits. Serial number engraved on the rehaut at 6 o'clock (from ~2005 on). Older models: between the lug holes at 6 o'clock on the case.
Further sources
Buying guide: Rolex GMT-Master II
Market situation and price range
At $24,429 the GMT-Master II sits in a segment where first owners sell regularly — clean pieces with box and papers are not uncommon. The jump from "good" to "very good" usually costs 1,000 to 2,000 euros more at purchase. You get that premium back on resale if the condition is preserved.
Where the price stands
Barely any movement over the past four months (+4.5%). The market for this reference is calm, with no pressure in either direction. Good for buyers who want to compare at their leisure.
Watch out for swings: This reference has an above-average volatility of 29.5 percent. In concrete terms: the price can move by several hundred euros within a few weeks. Check the current value before buying or selling — old listings or auction results from two months ago are of little help.
What to look out for when buying?
- Authenticity: The serial number and reference on the case must match the papers. A professional authenticity check of the Rolex GMT-Master II reliably rules out counterfeits.
- Condition: Check scratches on the case and bezel — professional refurbishment can leave traces.
- Service history: A documented service by the manufacturer or a certified watchmaker increases the value.
- Scope of delivery: Box, papers and warranty card make a noticeable price difference on the GMT-Master II.
- Independent certification: The CPS-52 standard covers 52 checkpoints — from the serial number and the timing machine to water resistance. The result is secured on the blockchain and can be verified at any time.
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