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GemFYI

Comprehensive gemstone encyclopedia — gemstones with physical, optical, value, and cultural properties. Categories include precious, semi-precious, organic, and synthetic gems. Covers Mohs hardness, refractive index, color science, birthstones, origins, treatments, and jewelry suitability.

For agents: Gemstone encyclopedia covering physical, optical and value properties, birthstones, origins and treatments, plus gem comparison and carat/ring size calculators.

gemstonesgem encyclopediamohs hardnessbirthstonesgem comparatorjewelry

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-22T03:25:01.517Z. Cached copy · Source on gemfyi.com

# GemFYI

> Comprehensive gemstone encyclopedia — gemstones with physical, optical, value, and cultural properties. Categories include precious, semi-precious, organic, and synthetic gems. Covers Mohs hardness, refractive index, color science, birthstones, origins, treatments, and jewelry suitability.

## Data Scope
- Gemstones with physical properties (Mohs hardness, specific gravity, crystal system, cleavage, luster)
- Optical properties (refractive index, birefringence, dispersion, pleochroism, fluorescence)
- Color data (primary color, color range, color cause, allochromatic vs idiochromatic)
- Value and market data (price tiers, price per carat ranges, value factors)
- Cultural data (birthstone months, zodiac signs, anniversary years, symbolism)
- Treatment information (common treatments, disclosure guidelines)
- Jewelry use data (durability rating, popular cuts, care instructions)
- Gem origins with quality tiers (legendary, premium, commercial)
- Gem comparisons (N² pages) with side-by-side analysis
- Glossary terms organized by gemology category
- Guides in series with full markdown content
- Interactive tools: comparator, property ranker, carat converter, price estimator, and more
- 15 languages supported with i18n

## URL Patterns
- Append `.md` to any URL for plain-text markdown format.
- i18n: URL prefix `/{lang}` for non-English (ko, ja, zh-hans, es, fr, de, pt, ru, vi, tr, ar, hi, th, id).
- `/` — Homepage with featured gems and stats (e.g. `/`)
- `/gems/` — Browse all gemstones (e.g. `/gems/`)
- `/gems/{slug}/` — Gemstone detail page (e.g. `/gems/diamond/`)
- `/compare/` — Gem comparison index (e.g. `/compare/`)
- `/compare/{slug_a}-vs-{slug_b}/` — Gem comparison (e.g. `/compare/diamond-vs-moissanite/`)
- `/category/{slug}/` — Gem category (precious, semi-precious, etc.) (e.g. `/category/precious/`)
- `/colors/` — Browse gems by color (e.g. `/colors/`)
- `/colors/{color}/` — Gems of a specific color (e.g. `/colors/red/`)
- `/origins/` — Gemstone origins and mining regions (e.g. `/origins/`)
- `/origins/{slug}/` — Origin detail (e.g. `/origins/kashmir/`)
- `/birthstones/` — Birthstone guide by month (e.g. `/birthstones/`)
- `/birthstones/{month}/` — Birthstone for a month (e.g. `/birthstones/april/`)
- `/glossary/` — Gemology glossary (e.g. `/glossary/`)
- `/glossary/{slug}/` — Glossary term (e.g. `/glossary/birefringence/`)
- `/guides/` — Gemstone guides (e.g. `/guides/`)
- `/guide/{slug}/` — Guide article (e.g. `/guide/diamond-buying-guide/`)
- `/tools/` — Interactive gemstone tools (e.g. `/tools/`)
- `/tool/{slug}/` — Tool page (e.g. `/tool/gem-comparator/`)
- `/gems/{slug}/buying-guide/` — Buying guide for a gem (e.g. `/gems/emerald/buying-guide/`)

## Browse Gems
- [All Gemstones](https://gemfyi.com/gems/)
- [By Category](https://gemfyi.com/category/precious/)
- [By Color](https://gemfyi.com/colors/)
- [Birthstones](https://gemfyi.com/birthstones/)
- [Origins](https://gemfyi.com/origins/)
- [Gem Comparisons](https://gemfyi.com/
…

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