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Core element 辛, 1 of 10

Xin Metal Day Master (辛)Yin Metal: the jewel.

Like a precious jewel refined under pressure, Yin Metal personalities are sensitive, perceptive, and exquisitely refined. Their beauty comes from depth.

The Metal Oracle
Jewel. Refined, precise, shines once it is polished.Shown: the Metal Oracle, one of its 8 guardians.

Short answer

Xin (辛), also called Yin Metal, is one of the ten Day Masters in BaZi: the core element that stands for you in a birth chart. Its image is the jewel, the polished gem. As a Day Master it describes your core temperament: Their beauty comes from depth.
On this page

Who you are

Yin Metal is the jewel. Pressure made it, polish shows it off, and it sees far more than its calm surface suggests. You often look composed and elegant. Underneath, a lot is going on.

You feel things sharply, more than you let on, and you apply that to the quality of everything: ideas, craft, friendships, your own work. Your standards are high not from vanity but because you can see the gap between excellent and good enough.

The catch is the pressure that made you. You may carry a quiet feeling of not yet being good enough. That drives your craft, but it can make you hard on yourself, and sometimes hard on people who are doing their best.

Where you shine

Sharp eye

You spot the weak point in a strong argument and the small shift in someone's tone.

Taste

You have a real sense of quality. What you make is worth a second look, because you won't stop until it's right.

Clear analysis

You can weigh arguments and find the problem with precision.

Deep feeling

Behind the calm is a rich inner life. The bonds you choose run very deep.

Choosy but loyal

You don't give trust easily. When you do, it lasts.

What to watch for

Perfectionism

Your standard is hard to hit every time. When you or others miss it, the disappointment is outsized.

Stung by criticism

You are skilled at critique but feel it sharply yourself, and recover slowly.

Guarded

Your polish protects you. Even trusted people may wait a long time to get close.

Comparing

You measure yourself against the very best, and judge yourself unfairly.

At work

You excel where precision and taste are the job: jewellery, watchmaking, medicine, law, editing, art direction, quality control, data science. You do your best work with real standards and room to work your way. You can lead a small, skilled team and lift everyone's work. Jobs that reward volume over quality, or fake enthusiasm, are a poor fit.

In love

You are very choosy in love, for good reason: a bad match costs you a lot. You study people before you trust them. Once committed, you bring rare depth. The risk is a loop: you criticise, or you feel criticised and pull away. You do best with someone who loves your depth, lets you be imperfect, and stays steady through your quiet spells.

Your element: Metal

The Metal element embodies precision, boundaries, and the capacity to let go. In classical Five Element thought, Metal belongs to autumn and its emotion is grief, the ability to value what matters, release what doesn't, and draw clear lines. When balanced, Metal becomes discernment, discipline, and the courage to cut away excess. When excessive, it turns into rigidity, cold perfectionism, or an inability to move past loss. Metal personalities see the world with rare clarity, but must learn that not everything worth keeping is flawless.

Classical linkMetal
SeasonAutumn
DirectionWest
Core emotionGrief (悲)
TraitsDisciplined, Discerning, Principled, Detached, Refined

Earth feeds you, Fire tames you. Read about the Metal element or see how the elements get along.

Your Yang twin

Yang Metal, the sword

Same element, a different way of carrying it. Like a finely forged sword, Yang Metal personalities are decisive, courageous, and direct. They cut through complexity with clarity and conviction. Read about Yang Metal.

For the curious: the proper names
Day Master 日主
The classical name for your core element: the top character of your day pair.
Xin 辛
The Mandarin name of Yin Metal, the jewel. One of the 10 sky signs (Heavenly Stems 天干).
Geng 庚
The Mandarin name of Yang Metal, the sword.
Ten Gods 十神
The forces in your chart. Your strongest force picks which guardian below is yours.

FAQ

Questions people ask

What is the Xin Metal Day Master in BaZi?
BaZi writes your birth moment as 8 Chinese characters, and the top character of your birth day stands for you. Classical books call it the Day Master; we call it your core element. Xin (辛) is one of the 10 possible: Yin Metal, the jewel. Like a precious jewel refined under pressure, Yin Metal personalities are sensitive, perceptive, and exquisitely refined. Their beauty comes from depth.
How do I know if I am a Xin Metal Day Master?
It comes from the day you were born. In the Chinese calendar every day carries one of 60 pairs of characters, in a cycle that has run without a break for well over 2,000 years, and the top character of your birth day's pair is your core element (the Day Master). You cannot work it out from your birthday in your head, so use a calculator: Elemental Fate's free one does it in about a minute.
What element is Xin Metal?
Xin is Metal (金). Every element comes in an outward (yang) and an inward (yin) form, and Xin is the inward (yin) one. Chinese tradition also links Metal with autumn and the west.
What is the difference between Xin and its Yang counterpart?
Both are Metal, in its two forms. Xin (the jewel) is the inward (yin) form: more adaptable, subtle and refined. Geng (the sword) is the outward (yang) form: more direct, bold and outgoing. Same element, a different way of carrying it.
Which archetypes have a Xin Day Master?
8 of Elemental Fate's 80 guardian spirits have Xin (Yin Metal) as their core element: The Metal Magistrate, The Metal Duelist, The Metal Keeper, The Metal Trader, The Metal Oracle, The Metal Mystic, The Metal Artisan, The Metal Rebel. Which one is yours depends on the strongest force in your chart, and your birth month decides that.

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