DAY MASTER
Xin 辛 — Yin Metal, The Jewel
If your Day Master is Xin, you were born under Yin Metal — the gem, the jewel, the finely wrought ornament. Where Geng is the sword, you are the blade's polished edge: precision rather than force. You are here to refine everything you touch, including yourself.
Personality
A jewel's value lies in its cut, clarity and finish — and that is how you move through the world. You are refined, precise and quietly exacting, with an eye that catches the flaw in the diamond before anyone else notices the stone. You care about quality in every sense: work, words, manners, aesthetics. Presentation matters to you, not from vanity but from a deep belief that how a thing is done is part of what it is. You are sensitive beneath the polish — criticism lands on you harder than you ever let on, because you hold yourself to standards most people cannot even see. You dislike chaos, coarseness and being rushed; you prefer one exquisite thing to ten adequate ones. Others experience you as elegant, discerning and slightly unreachable. They are not wrong: gems are beautiful partly because they are hard.
Strengths
Your precision is extraordinary. You refine, edit, polish and perfect — you take the rough draft of anything and find the finished version hiding inside it. This makes your judgment exceptionally valuable: you spot the error, the off note, the missing detail that changes everything. You also have natural grace and presentation skills; you know how to make work, and yourself, land well. Because you are Yin Metal, your strength is subtle rather than loud — you influence through standards, taste and quiet insistence on excellence, and entire teams rise to meet the bar you set. You are resilient in a particular way too: gems are formed under immense pressure and emerge unbreakable. Hardship does not crush you; it facets you.
Blind spot
The jewel's shadow is perfectionism with a wound underneath. You can polish past the deadline, past the point of value, past the joy — unable to release anything, including yourself, as simply good enough. Criticism cuts you disproportionately: one careless remark can echo for days, because part of you suspects the flaw is real. You may hide behind polish, presenting an immaculate surface while keeping people at a gem's distance, then feeling lonely inside the display case. Image-awareness can tip into vanity or into harsh judgment of people who do not meet your standards. And you sometimes forget that your sensitivity is not a defect to be buffed out — it is the very thing that lets you see what others miss.
In love
In love you are romantic, attentive and quietly intense. You notice everything about a partner — the small preferences, the shifts in mood — and you court with thoughtfulness rather than grand gestures. You need a relationship that feels as good on the inside as it looks on the outside, and you will not stay long where you feel criticised or taken for granted; your pride and your tenderness are the same organ. The risk is performing the relationship: curating an image of couplehood while your real feelings stay unspoken behind the shine. You do best with someone who admires your refinement but gently insists on the unpolished you. When you feel truly safe, the brilliance softens into something rare — devoted, playful and deeply loyal.
At work
You flourish where quality and presentation decide value: design, fashion, jewellery and luxury goods, editing and publishing, finance and analysis, law, medicine and dentistry, branding, and any craft where precision is the product. You make an exceptional specialist, critic, editor or quality gatekeeper — the person whose sign-off means something. You work best in refined, orderly environments with autonomy over your own standards; chaos and corner-cutting genuinely distress you. As a leader you inspire through excellence rather than force, though you should watch that your high bar does not become contempt for those still climbing toward it. Price your polish properly: the world pays for flawless, and flawless is what you do.