Ba Zi Day Master guide · 8 of 10

Yin Metal: The Jewel

Xin (辛), the eighth of the ten Heavenly Stems.

4 min read · 7 November 2026
The short answer

Xin (辛) is Yin Metal. Its classical image is a jewel, fine silver or a polished blade: precious, precise and refined. People born on a Xin day are traditionally read as perceptive, elegant and perfectionist, with high standards for themselves and everything they touch.

The imageThe Jewel

A diamond starts as carbon under unimaginable pressure. A pearl starts as a grain of grit the oyster couldn't get rid of. Every jewel has a hard story behind its shine.

That's Xin. It is the Day Master of refinement. Xin people often have an eye for quality, a sharp mind and a sensitivity they hide well. They shine under pressure, and they've usually been under quite a lot of it.

StrengthsWhat Yin Metal brings

PrecisionXin notices the detail everyone else missed and gets it exactly right.
EleganceJewels are Xin. There's often taste, style and a sense of presentation.
ResilienceJewels are formed under pressure. Xin people often grow most through hardship.
ValueXin knows its worth, or at least is learning to.

The shadowWhere Yin Metal gets stuck

A jewel scratches easily. Xin's trap is sensitivity to criticism, perfectionism and pride: wanting to be seen as flawless, and finding it painful to admit mistakes. Xin can also be cutting with words when hurt. Learning that your value doesn't depend on being perfect is the lifelong lesson.

In loveYin Metal in relationships

In love, Xin is devoted, thoughtful and quietly romantic. It wants a partner who truly sees its worth. The growth edge is letting someone see the uncut stone, not just the polished surface, and not testing a partner to prove they'll stay.

At workYin Metal and career

Xin excels in work that rewards precision and quality: science, finance, design, fashion, jewellery, editing, medicine, law, research, any field where the detail is the difference. It may struggle where sloppiness is tolerated.

BalanceWhat helps Yin Metal thrive

Classically, a jewel needs Yang Water (壬, clear water) to wash it and let it shine: expression, communication and cleansing reflection. Fire refines it, but too much harsh Fire melts it, so pressure helps only up to a point. Too much Earth buries it: a jewel needs to be seen. Your whole chart shows the real balance.

How it connectsYin Metal and the five elements

In Ba Zi, every element feeds one element and controls another. From the point of view of a Yin Metal Day Master, here's what each element represents:

Same element · CompanionMetal: friends, siblings, peers, and rivals. Support, and competition.
Feeds you · ResourceEarth: learning, mentors, rest, the people and habits that nourish you.
You feed · OutputWater: your creativity, expression and what you give to the world.
You control · WealthWood: what you work on and earn from. Money, tasks, results.
Controls you · PowerFire: discipline, authority, rules and pressure. It shapes you, or wears you down.

Its natural partner among the ten stems is Yang Fire (丙 Bing). The two stems "combine," which is traditionally read as an attraction, though real compatibility always depends on both full charts.

Born on a Xin dayFamous Yin Metal Day Masters

Marie Curie and Ada Lovelace, two of history's most precise minds, were both born on Xin days: the jewel refined under pressure.

Calculated by SkyConfluence from documented birth dates. Birth times aren't known, so these are by calendar date.

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FAQQuick questions

What does Xin Metal mean in Ba Zi?

Xin (辛) is Yin Metal, the eighth Heavenly Stem. Its image is a jewel or fine silver, traditionally linked with precision, elegance, resilience and high standards.

How do I find my Day Master?

Your Day Master is the Heavenly Stem of the day you were born, taken from the 60-day cycle used in Chinese calendars. You can calculate it from your date of birth with the free calculator on SkyConfluence's Day Master page.

Which Day Master pairs with Yin Metal?

In Ba Zi, each stem has one "combination" partner. Xin (辛) combines with Bing (丙, Yang Fire), traditionally read as a natural attraction. Real compatibility depends on both full charts, not one stem.

All tenThe other Day Masters

甲Yang Wood乙Yin Wood丙Yang Fire丁Yin Fire戊Yang Earth己Yin Earth庚Yang Metal辛Yin Metal壬Yang Water癸Yin Water
Sources and notes Imagery follows the classical Ba Zi tradition, including the Di Tian Sui (滴天髓) and the Qiong Tong Bao Jian (穷通宝鉴), retold in plain English. Background: Heavenly Stems, Four Pillars of Destiny. Famous examples: day pillars calculated by SkyConfluence from documented birth dates (Gregorian calendar, by calendar date; birth times are not known, so a late-evening birth could fall on the next day in some schools). Ba Zi is a traditional system of symbolism, offered for reflection and entertainment, not prediction.