Disclosure context

About thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 424 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post May 18, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

May 12, 2026Oriental Diamond listed by thegentlemenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 2,458 disclosures indexed across all operators we track. Geographically, Oriental Diamond is reported in JP, a country with 88 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

← All victims

Oriental Diamond

Claimed by thegentlemen · listed 8 days ago

Age

since listed · data leaked

Status timeline

Listed
May 12, 2026
Data leaked

At a glance

Group: thegentlemen
Status: Data leaked
Country: JP
Sector: Manufacturing
Listed on leak site: May 12, 2026

About the victim

AI dossier — public-source company profile

Oriental Diamond Inc. is a Tokyo-based Japanese diamond company founded in 1966, specializing in the import, design, and manufacturing of fine diamond jewelry and loose stones. The company was the first in Japan to earn the De Beers Sightholder qualification, enabling direct sourcing of conflict-free diamonds. Its product portfolio includes branded jewelry collections, bridal diamonds, and kimono wholesale.

Industry: Luxury Goods & Jewelry (Diamond Import, Design & Manufacturing)
Address: Tokyo, Japan
Founded: 1966

Attack summary

Severity: high — Data has been published (not merely threatened), confirming exfiltration of significant business data from a known luxury-sector company; while no explicit regulated PII volume is confirmed, a company handling bridal/retail customers likely holds customer PII, elevating severity to high.

The group 'thegentlemen' claims to have exfiltrated data from Oriental Diamond Inc. and has published the data (disclosed status: data_published), though no specific data size or ransom demand was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Corporate business data
Jewelry/product inventory records
Potentially customer and order records
Potentially supplier and sourcing documents

What the group claims

orientaldiamond.jp Oriental Diamond Inc. is a pioneering Japanese diamond enterprise established in 1966, specializing in the import, design, and manufacturing of fine diamond jewelry and loose stones. As the first company in Japan to earn the prestigious Sightholder qualification, they combine global sourcing with in-house craftsmanship to deliver conflict-free diamonds and elegant collections like Hoshi no Suna. With a heritage of excellence and a diversified portfolio spanning jewelry, bridal, and traditional kimono wholesale, they continue to innovate as a trusted market leader in Tokyo's luxury sector

Sources

Victim siteorientaldiamond.jp

Source

Indexed 8 days ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.