Knyvola Spree

Knyvola Spree is a gemology bench in your pocket — a lapidary testing broadsheet built around the tool 🛠️ a working gemologist actually uses: the dichotomous key. THE KEY Set a stone and walk it down. Every step is a couplet — two printed lines. Read the left branch and the right, run the one test that separates them, and tap 👆 the result the stone actually gave. Refractive index over or under 1.70. Singly or doubly refractive. Doubled back facets, or single. Each correct call pins a node in spot-red down a lit spine, while the branches ahead stay ghosted in halftone until you earn them. Get it wrong ❌ and the reading contradicts the branch: the node dead-ends teal and you back up a couplet to un-file it. It is a real branching key with eleven couplets resolving fourteen stone profiles, not a multiple-choice quiz ❓ wearing a key's clothes. THE BENCH Six instruments, each with real readings for every stone: polariscope, refractometer, hydrostatic specific gravity, dichroscope, spectroscope and loupe. The key asks for one test per node — but nothing stops you taking the specific gravity reading before it is asked. Pre-empt the gotcha and the convergence says so. THE SPECIES PLATES Sixty species across corundum, beryl, garnet, quartz, feldspar, oxide, organic and simulant groups. Every plate carries optical and physical constants, diagnostic tests, and notes 📝 separating natural material from synthetic and simulant. Cross-references point at the stones each one is confused with, and any plate can be loaded straight into The Key. THE LAPIDARY PRIMER Fifteen ordered lessons from reading a couplet through to filing a finished identification, with inline knowledge checks. Three of them stay locked until you have actually walked a key — the primer will not let you read your way past the bench. THE SEPARATIONS Twelve classic gotcha pairs, side by side: diamond against moissanite, ruby against red spinel, ruby against almandine garnet, natural ruby against flux-grown synthetic, emerald against green tourmaline, diamond against cubic zirconia, jadeite against nephrite and more. The comparison flags exactly which test discriminates, so you learn 📖 the tell rather than memorising a table 📋. THE PARCEL PAPERS Every clean 🧼 convergence files an identification plate — species, natural / synthetic / simulant flag, the exact path you walked through the key, and a photograph of the stone if you take one. Eight worked identifications ship with the app 📱 as reference. Export 📤 any plate as a printed card to your gallery 🖼️, or share 🤝 it. THREE BROADSHEET THEMES Cream Broadsheet, Ink Nocturne and Sunstone — risograph-inflected palettes with mis-registered ink and printers' rules. Every surface retints live. WORKS OFFLINE, KEEPS TO ITSELF 📴 No account. No sign-up. No ads. No analytics 📊. Every species plate, lesson 📖, separation and identification lives in a database on your device 📱, and the app never uploads any of it. Photographs you take stay in the app 📱's private 🔒 storage until you choose to export 📤 or share 🤝 them. Knyvola Spree is a study 📖 and practice 🏋️ tool 🛠️ for students, collectors, hobbyist lapidaries and anyone who wants to stop guessing at a stone. It is not a substitute for laboratory testing or a professional appraisal, and it does not grade, value or certify gemstones.