1. The charismatic leader (Ole Nydahl) surrounded by groupies and Ole Clones. This is known as a cult of personality. He also has no authentic credentials, and is not qualified to hold the title of Lama.
2. The manipulation of information. Books Ole Nydahl doesn't agree with or are critical of him are banned from the centres. Members are also discouraged from seeking teachings from any other source.
3. Abuse of members lower in the heirachy by those higher up.
4. Questions or criticisms from members are dismissed and supressed. The member is then made to feel guilty and told it is their fault.
5. Diamond Way has it's own words and language, to separate members from the public. New members are also given fancy new Tibetan names to make them feel important and separate them from their old life.
6. There is one rule for those lower in the heirachy, and another for those at the top. For instance, DW teaches that adultery is wrong (in common with authentic Buddhism), but at the same time, Ole Nydahl is known to have had affairs with several of his students, and had a mistress called Caty Hartung as well as his wife, Hannah.
7. The true beliefs of the group (only some of which are contained here) are kept secret from members until they are sufficiently brainwashed, and before that are lied to, just as DW lies to the public about it's true beliefs.
8. Everything in DW has a price, and the money flows to the top of the heriachy. There is also huge pressure to donate money, whether you can afford it or not. Members are milked for everything they have, while Ole Nydahl lives a life of luxury, flying round the world and having everything paid for him.
9. DW uses brainwashing techniques.
10. Former members are harassed, slandered and told to shut up about their experiences.
These are all hallmarks of cults.