Hotel guide · All-inclusive · Montego Bay, St James

Muthu Diamond Lagoon (formerly Grand Decameron Montego Beach): what to know before you book

Reopening December 2026 (as Muthu Diamond Lagoon). It isn't taking guests yet. Check the date before you book; the guide below has open alternatives.

Curved pool with loungers beside the sea at Muthu Diamond Lagoon in Montego Bay
On this page
  1. My local take
  2. At a glance
  3. Pros and cons
  4. Location
  5. FAQ
  6. Sources

My local take

If you’re searching for Royal Decameron Montego Beach, it’s changing hands and names. In January 2026, MGM Muthu Hotels agreed to buy it and its sister hotel, Royal Decameron Cornwall Beach, from Decameron, according to the Jamaica Tourist Board. It has been closed since Hurricane Melissa in October 2025, and on September 15, 2026, the Jamaica Information Service said it’s slated to reopen in December 2026 as Muthu Diamond Lagoon. MGM Muthu’s own website still says Opening Soon, with no date, and the Jamaica Tourist Board lists it as closed under the old Decameron name.

Cornwall Beach, the Decameron a short way along the same road, is going the same way: JIS lists it for a December 2026 reopening as Muthu Crystal Cove, and MGM Muthu’s site also shows it as Opening Soon.

My take: don’t book either until MGM Muthu publishes a date and takes bookings on its own site. I’ll update this page when it reopens. For an all-inclusive near Montego Bay that’s open now, look at Iberostar Rose Hall Suites or Deja Resort, a small all-inclusive on the same Hip Strip. More options: the best all-inclusive resorts in Montego Bay.

At a glance

Name
Muthu Diamond Lagoon Montego Bay (formerly Royal Decameron Montego Beach, later Grand Decameron Montego Beach)
Status
Closed; the Jamaica Tourist Board still lists it under the Decameron name
Reopening
The Jamaica Information Service said in September 2026 that it is slated to reopen in December 2026 as Muthu Diamond Lagoon
Operator
MGM Muthu Hotels, which agreed to acquire the hotel from Decameron in January 2026
Booking
MGM Muthu's website lists it as Opening Soon, with no date

Checked October 2026 against the sources below. See sources. Something changed? Tell me.

What to know before booking

  • Closed: the Jamaica Tourist Board still lists it as closed as of October 2026.
  • The December 2026 reopening comes from JIS; MGM Muthu hasn't published a date.
  • Some booking sites may still show the old Decameron name and availability.

Location

The resort is on the Hip Strip (Jimmy Cliff Boulevard) in Montego Bay, walking distance from bars, restaurants and Doctor’s Cave Beach. See the Hip Strip guide, and where to stay in Montego Bay for open resorts nearby.

Questions people ask

Is Royal Decameron Montego Beach open?

No. It is closed, and the Jamaica Information Service says it’s slated to reopen in December 2026 as Muthu Diamond Lagoon.

What is Decameron Montego Beach called now?

Muthu Diamond Lagoon Montego Bay. MGM Muthu Hotels agreed to acquire it from Decameron in January 2026.

What happened to Decameron Cornwall Beach?

It’s also moving to MGM Muthu Hotels and is slated to reopen in December 2026 as Muthu Crystal Cove, according to the Jamaica Information Service.

Where can I stay in Montego Bay instead?

Iberostar Selection Rose Hall Suites and Deja Resort on the Hip Strip are open all-inclusives, and Half Moon has partly reopened.

Sources & updates

Update log

  • — Rewritten as a status page: closed after Hurricane Melissa.
  • — Renamed Muthu Diamond Lagoon (formerly Grand Decameron Montego Beach): new operator MGM Muthu Hotels, December 2026 reopening per JIS; added the Cornwall Beach to Muthu Crystal Cove rename.
  • — Link refresh: Status page: swapped Grand Palladium for Deja Resort on the same Hip Strip and linked the Montego Bay best-of list (local take and FAQ).
  • — Moved source citations out of the text
  • — Removed repeated advice
  • — Trimmed hurricane references to where they change the advice
  • — Re-checked reopening status against MGM Muthu's hotel page, the Jamaica Information Service and the Jamaica Tourist Board reopening schedule; no change.

Spotted something out of date? Tell me and I’ll check it.

Compare with similar resorts

Nearby things to do

More in Montego Bay