His friend wears necklaces and earrings, and he wants to advise him
Question

                I have read that it is permissible for men to wear silver or any other precious metals except for gold. 1- What about diamonds, fake gold and gold plated? Also what is the ruling on having arabic engraved on your jewellery, i.e. A ring with Allah written in Arabic. Is this allowed? Another thing is it permissible for men to wear chains, or bracelets? 2-I have a problem, I have a friend at school, who is Muslim, but he does not practice Islam as far as I know. The main problem is that he wears two diamond, with i think a bit of gold ear-rings on his right ear. I told him that its not allowed, gave him some daleel, about wearing gold, and jewellery for men. But I don't think he read it. Can you provide me some daleel on ear-rings which I can give him, and how should I deal with this issue.
Praise be to Allah.
    Firstly: 

    It is haraam for men to wear gold, because of the hadeeth 
    narrated by Muslim (2090) from Ibn ‘Abbaas (may Allaah be pleased with him) 
    which says that the Messenger of Allaah  (peace and blessings of Allaah 
    be upon him) saw a gold ring on a man’s hand. He took it off and threw it 
    aside, and said: “Would one of you go and pick up a live ember of fire and 
    hold it in his hand?” After the Messenger of Allaah  (peace and 
    blessings of Allaah be upon him) had left, it was said to the man: Take your 
    ring and benefit from it (by selling it). He said: No, by Allaah, I will 
    never pick it up when the Messenger of Allaah  (peace and blessings of 
    Allaah be upon him) has thrown it aside. 

    Abu Dawood (4075), al-Nasaa’i (5144) and Ibn Maajah (3595) 
    narrated from ‘Ali ibn Abi Taalib (may Allaah be pleased with him) that the 
    Prophet  (peace and blessings of Allaah be upon him) took a piece of 
    silk in his right hand and a piece of gold in his left and said: “These two 
    are haraam for the males of my ummah.” Classed as saheeh by al-Albaani in 
    Saheeh Abi Dawood. 

    Ahmad (6556) narrated from ‘Abd-Allaah ibn ‘Amr ibn al-‘Aas 
    (may Allaah be pleased with him) that the Messenger of Allaah  (peace 
    and blessings of Allaah be upon him) said: “Whoever of my ummah wears gold 
    and dies wearing it, Allaah will forbid the gold of Paradise to him, and 
    whoever of my ummah wears silk and dies wearing it, Allaah will forbid the 
    silk of Paradise to him.” Classed as saheeh by Shu’ayb al-Arna’oot in 
    Tahqeeq al-Musnad. 

    Al-Nawawi (may Allaah have mercy on him) said in Sharh 
    Muslim: As for gold rings, they are haraam for men according to 
    scholarly consensus. The same applies if they are partially gold and 
    partially silver. End quote. 

    As for fake gold, there is nothing wrong with wearing it, 
    because it is not really gold, so it is not included in the ahaadeeth which 
    forbid gold to men. But it is better not to wear it, because people may 
    think badly of the one who wears it, and others may take him as an example 
    and think that he is wearing real gold. 

    As for gold plated items, what is agreed among the fuqaha’ 
    many fuqaha’, is that if the layer of gold produces any amount of gold upon 
    being scratched or exposed to fire, if  then it is haraam, but if it is 
    simply a colour, and no gold can be produced from then there is nothing 
    wrong with wearing it. 

    See: al-Majmoo’ (4/327) and al-Insaaf (1/81). 

    Secondly: 

    It is permissible for a man to wear rings and watches that 
    contain precious metals or stones – other than gold – such as diamonds, 
    because the basic principle is that they are permissible, and there is no 
    evidence to suggest that that is not allowed, unless they are part of 
    women’s jewellery such as bracelets and necklaces, in which case that is not 
    allowed. 

    It says in Fataawa al-Lajnah al-Daa’imah (24/77): 
    Wearing rings is permissible for men if they are made of silver or precious 
    stones, except for gold. End quote.   

    Thirdly: 

    It is not permissible for a man to wear women’s jewellery, 
    such as bracelets, necklaces and earrings, whether they are made of gold, 
    silver or anything else, because that is imitating women, and the Prophet 
     (peace and blessings of Allaah be upon him) cursed men who imitate 
    women. This has been discussed in the answer to question no.1980 

    Fourthly: 

    You should advise your friend and explain to him that it is 
    haraam for men to wear earrings, and that doing so includes a number of 
    things that are haraam: (i) wearing something that contains gold; (ii) 
    imitating women; (iii) imitating the kuffaar, because it is the custom in 
    some kaafir societies for men to wear earrings. The Prophet  (peace and 
    blessings of Allaah be upon him) said: “Whoever imitates a people is one of 
    them.” Narrated by Abu Dawood (4031); classed as saheeh by al-Albaani in 
    Saheeh Abi Dawood. 

    We ask Allaah to guide us and you. 

    And Allaah knows best.