CruKarat Jewel

CruKarat Jewel is a hands-on precious-metal alloy recipe and melt-ticket studio for bench goldsmiths, jewelry students, small-shop casters, and custom-jeweler apprentices. Lock karat fineness, plan master-alloy additions, run scrap blend math, and set pour weights before you light the torch—fully offline, with no account gate and no empty calculator shell. Open a seeded crucible recipe card, tune Au, Ag, Cu, Zn, Ni, and Pd parts on a live fineness bar, preview color tier and workability, then solve a melt ticket from the fine gold and scrap you have on hand. Estimate ingot-mold fill by density and export a shareable melt summary so you stop guessing additions at the crucible. Browse a built-in cabinet of 24+ classic jewelry alloys—14k US yellow, 18k European rose, nickel-white, palladium-white, green gold, 22k coin yellow, sterling-adjacent solder mates, and platinum hardener sketches—shown as layered molten-metal recipe cards with karat badges and use-case tags. Build or fork a custom alloy: lock target karat or fineness, drag part ratios for pure gold, silver, copper, zinc, nickel, and palladium, and watch a live millesimal fineness bar with overshoot and undershoot warnings. Preview approximate alloy color on a warm-rose to cool-white continuum swatch, plus hardness tier, anneal frequency hints, and torch-solder flow compatibility notes tied to the mix. Compose a melt ticket from metals on hand: enter fine-gold weight, scrap lot karat and mass, and optional melt-loss percent, then compute exact master-alloy and base-metal additions needed to hit the locked karat. Solve multi-lot scrap blends toward a target fineness—add several scrap bags with different karats, see the weighted average, and get trim additions so the pot lands inside a safe fineness band. Estimate pour weight from ingot or sprue-button mold cavity dimensions using alloy-specific density, with fill-percent and leftover heel guidance before casting. Compare two alloys side-by-side on fineness, color tier, relative hardness, scrap-friendliness, and recommended jewelry use (shank, bezel stock, filigree, casting grain). Export a clean melt-ticket summary via the system share sheet as plain text or simple PDF, listing recipe parts, additions, loss assumption, and pour estimate. In-app Privacy Policy and Terms screens stay always available, with accurate privacy labels for a fully offline bench utility—no gem-ID, faceting, or stone-mount overlap, just torch-ready karat control.