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Keep everyday jewelry design tools close at hand. GuiYiJu brings ring sizing, casting weight estimates, 3D model inspection, and photo watermarking to your iPhone—for designers, makers, students, and small studios. RING SIZES & PRINTABLE PDFS Convert ring size, inner diameter, or inner circumference across Taiwan, Hong Kong, Japan, US, UK, and European systems. Choose which systems to display, save multiple sizes, and generate an A4 PDF at 1:1 scale to save, share, or print. The size data is bundled with the app, so conversion and PDF generation work offline. WAX & RESIN WEIGHT CONVERSION Enter the weight of a wax or resin model to estimate its weight in your chosen metal using material densities. Enter grams or Taiwan mace and see both units in the results. Adjust densities and copy a report for your workflow. One Taiwan mace equals 3.75 grams. 3D JEWELRY MODEL INSPECTION Import STL or OBJ files, rotate and zoom, and inspect dimensions and orthographic views. Review suggested part classifications and preview metal finishes or gemstone materials. Estimate the metal portion's weight and compare materials. A sample ring is included to help you get started. LOGO WATERMARKS Choose your artwork photos and logo, then adjust the watermark's position, size, and opacity. Work on individual photos or apply one setup to a batch. Import logos from supported AI, PDF, SVG, and common image files; export PNG or JPG images to Photos. Single-photo and batch work are saved separately so you can return to unfinished work. TWO INTERFACE LANGUAGES & FILE SHARING The app uses its Chinese interface for Traditional or Simplified Chinese system languages, and English for other system languages. You can also choose Chinese, English, or Follow System in Help. Share supported photos, logos, or models from another app to open the relevant tool. Website articles and videos remain in their original language. GUIYIJU ARTICLES & CONTACT Browse GuiYiJu's website for projects and tutorials, optionally enable notifications for new posts or videos, and find official contact channels. Online content requires an internet connection. Notifications use manual or iOS-scheduled background checks; delivery timing depends on the system, battery, network, and usage conditions. Website notifications are not a paid subscription. PLEASE NOTE • Print ring PDFs at actual size / 100% and check the calibration ruler. • Weight estimates depend on material density and model geometry. They do not include casting or finishing losses. • Review suggested 3D classifications yourself. Unusual cuts, damaged meshes, or fused parts may not be identified correctly. Appearance does not determine a real material. • AI means the Adobe Illustrator file format. Import support depends on file contents; missing fonts or unsupported effects may prevent a file from loading. • Performance varies with your device and file size. Core tools process selected photos, logos, and models on your device. Website browsing and third-party resources use the internet; see the Privacy Policy. Support: guiyiju@guiyiju.com Website: https://www.guiyiju.com/