Guides
This is where the reasoning behind the rest of the site gets written out in full — how a birthstone system counts as a source, why the comparison tables show disagreement instead of quietly resolving it, and what to make of a "confidence" label you see on the data. It's methodology, not marketing.
Latest guides
No long-form guides are published here yet — the reference hubs themselves (zodiac signs, months, and the gemstone glossary) came first. Guides will appear in this list as they go live; in the meantime, the editorial standard below applies to every page on the site already, whether or not it lives under /guides/.
Editorial standards
How a system gets dated and attributed
Every birthstone list on this site is treated as a named, datedsystem — not an anonymous fact. Each one records who set it (a jewelry trade body, a historical record, a specific retailer's published list), the year it was set or last revised where a year is knowable, and a plain-English caveat describing what kind of list it actually is. A pre-1912 historical record and a list revised in 2016 are not treated as interchangeable just because both assign a stone to the same month.
Why we show conflicts instead of resolving them
Two sites can each state a single, confident birthstone for the same month or sign and still disagree with each other, because they are quietly drawing on different systems. This site does the opposite on purpose: wherever more than one system has an answer, every answer is shown, attributed to its own source, side by side. A page here saying two systems disagree is reporting a real disagreement in the underlying trade and historical record, not a data error to be smoothed over.
What "confidence" means in the data
Each system-to-stone assignment behind the site carries a confidence rating of high, medium, or low, set independently of how old or well-known the system is. High confidence means the assignment traces directly to a clearly identified, checkable source; lower ratings exist for the schema to record cases where a source is thinner or a stone name is ambiguous, so that kind of uncertainty has somewhere honest to live instead of being rounded up to certainty.
Sources travel with the page, not in a footer
Every factual page on this site carries its own Sources section listing the specific references used, plus the date they were last checked. That retrieved date matters as much as the source itself — a birthstone chart can be revised, so a citation without a retrieval date is a weaker claim than one with it.
Where to start
Until there's a dedicated guide for a given question, these hub pages are the best entry point — each one already applies the standards above.
- Zodiac Birthstones — The traditional tropical zodiac and the modern jewelry-trade convention, compared sign by sign.
- Birthstones — Every calendar month, compared across four standardized lists from 1912 to today.
- Gemstones — An A–Z gemmological reference: hardness, color family, and species for every stone on the site.
- Birthstone Finder — Enter a birth date and see what every system says about it, side by side.