Isolated, the Jack of Diamonds represents the postman or, better said, the messenger. It also symbolizes a young soldier or an unfaithful servant (assistant, employee); sometimes a young blond man, traitor and of bad morals.
If the consultant is a young man, it is the announcement of new lovers.
If it is a young girl or a single woman, it is the certainty that, soon, a suitor will make himself known; he will be blond and pretty boy.
If, on the contrary, the consultant is married, he will soon learn of a somebody’s else marriage; but this card, surrounded by it, has many and varied meanings.

The Jack of Diamonds with a
Spade ♠: Treachery, infidelity.
Heart ♥: Certainty of marriage and news of birth.
Diamond ♦: Young risk-taking man, adventurer of misconduct.
Club ♣: Somebody will ask to borrow money from you.

Having on the left a
Spade ♠: A dark man you have every reason to fear.
Heart ♥: Love. Letter coming soon.
Diamond ♦: Null card.
Club ♣: Money that will be lost. Theft.

EXCEPTIONS.
The Jack of Diamonds, with the
King of Diamonds: News from a young adventurous man.
Between two sevens: News of a pregnancy.
Touching the Ten of Diamonds: Distant journey. (The other card touching it becomes null and void.)
Touching the ace of Clubs: News of an inheritance. (The other card touching it becomes null and void.)
Between two face cards: deceit, treachery, infidelity.
Between two aces: The Jack of Diamonds says nothing; he is absolutely silent.

Divorced woman or a widow, seduced and abandoned girl, jealous and vindictive nasty brunette; such is, isolated, the Queen of Spades, whose presence in the game is almost always fatal.

This card has on the right a
Spade ♠: A nasty brunette woman will slander you.
Heart ♥: A woman jealous of you will soon set a trap for you.
Diamond ♦: You will go to court about a divorce or another marital matter; you will win the case.
Club ♣: Obstacles caused by a young brunette woman, mostly but not exclusively about money.

Having on the left a
Spade ♠: A brown (brunette) girl, offended by you, keeps a relentless hatred for you; she looks for all possible ways to take revenge for the wrongs you have done to her. Whatever you do, you will not escape her revenge.
Heart ♥: Seduction by a dark, aggressive and forceful woman. She is used of getting her way. – Affront.
Diamond ♦: Unresolved disputes over a brunette woman. – Obstacles to your future success.
Club ♣: Certain loss of money. – Still, it is much better to suffer this loss and be rid of a relationship or a casual involvement with a brunette girl rather than continue with it.

EXCEPTIONS.
Between two Diamonds: Avoid taking a trip, signing on anything, starting new initiative, moving around; you would have a serious accident outside your home.
With the King and the Jack of Hearts: A brunette woman will be flirting, flattering, hoping to take advantage of you. She will use various tricks to deceive your good faith.
With the King of spades – two very bad cards make a very good omen. It means a fundamental change of character – turning from evil to good, finding conscience and generosity in people that are neither trustworthy, nor generous. It also means a happy relationship of two people, who previously were profoundly lonely and unhappy.

Like the Ace of Clubs, this card is the card of fortune.
Success, abundance, prosperity, unexpected succession, success in everything; such is the meaning of isolated Ten of Clubs.
Regardless of the place it occupies in the game being played, placed next to any card, this Ten is a very positive omen.
Judge for yourself:

Having on the right a
Spade ♠: Inheritance from a distant relative or another unexpected large financial gain.
Heart ♥: Joy. – Success in everything.
Diamond ♦: Gift from a friend.
Club ♣: A substantial sum of money lost, but then recovered with interest.

Having on the left a
Spade ♠: Change of job position. Exciting job prospects.
Heart ♥: Assured and unexpected wealth.
Diamond ♦: A gift from a man who is not from your town.
Club ♣: Money that is not expected.

EXCEPTIONS.
Between two figures of Kings or Jacks: Support of men.
Between two ladies: Rich wedding leading to a rich family. – Sincere friends.
Between a King and a Lady: Protection of married couple. Believe it or not – they care about you much more than you deserve.
Near the Queen of Spades: Money from a widow (or divorced or lone person). The other card with the Ten of Clubs is null; it does not speak.