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.

The Ten of Hearts, taken in isolation, means new plans. It is also a card related to the city that you live in.
It is a happy card which, according to the cards surrounding it, means: Success, joy, surprise, triumph.

Having on the right a
Spade ♠: Triumph. – You will take revenge on all your enemies.
Heart ♥: Joy. – Success in love.
Diamond ♦: Surprise coming from far away (from another town or even from another country).
Club ♣: Success in business.

Having on the left a
Spade ♠: New plans and projects implemented.
Heart ♥: Very great joy in your city.
Diamond ♦: Travel for happy change.
Club ♣: Success of all your projects.

EXCEPTIONS.
Between two cards of the same value: Departure of a friend. You will slowly drift apart.
With the King of Spades, the Ten of hearts cancels all the bad predictions of the other cards and it is a good idea to shuffle the cards and consult them with a fresh mind.