Zerin Gold

Zerin Gold is a gold dealer, jeweller and jewellery atelier in Freiburg im Breisgau. The site runs on a calm black-and-gold aesthetic with fine serif typography and restrained scroll animations — with gold, it isn’t volume that sells but the impression of solidity. Seven languages cover the customer base, Arabic including a right-to-left layout.

The technically interesting part is the price. A custom provider reads precious-metal quotes from Kitco, converts bid/ask per troy ounce into cents per gram of fine metal using the ECB exchange rate, and caches the result for two minutes — so the site shows dependable numbers without hitting the source on every visit. On top of that sit a margin engine the dealer controls from the admin area and four calculators: scrap-gold value, karat converter, Krugerrand and savings plan. The ticker in the header comes from the same source.

Underneath: Next.js 16 with React Server Components and Server Actions, Prisma 7 on PostgreSQL, Redis for caching, Auth.js v5 with Argon2 and a TOTP second factor for the admin area, Resend for email and Cloudflare Turnstile against form spam. Around 290 URLs with landing pages for the terms people actually search — from “gram altın” to wedding rings — plus Vitest and Playwright tests, hosted in Germany behind Cloudflare.