About RichPiece

RichPiece is a small, independent site built around six calculators for fine jewelry and precious metals, plus a reference museum. There is no company behind it beyond that — it is a free, advertising-supported resource, not a jewelry retailer, appraiser, or auction house. What follows is a straightforward walk through what each tool does and how it works, so you know exactly what you’re using before you use it.

Valuing your metal

Three tools deal with the metal itself. The Gold Value Calculatortakes an item’s weight, its karat, and a spot price you supply, and works out the intrinsic melt value in grams, troy ounces, pennyweight, or kilograms — the arithmetic behind “what is the gold in this worth,” nothing more. The Silver Value Calculatordoes the same for coins, flatware, or silver jewelry, letting you pick the fineness — 999, 925 sterling, 900, or 800 — against the current silver spot price. And the Gold Karat & Purity Calculator handles the conversion problem underneath both: karat to purity percentage and millesimal fineness, or a purity percentage back to karat, across the full 10k–24k range. None of these three quote a retail or resale price — they compute melt value from numbers you enter, which is a different (and simpler) question than what a piece would actually sell for.

Sizing up a stone

The Diamond Price Calculator estimates a price from carat weight and a price-per-carat figure — either a 4Cs quality-tier preset or a dealer quote you paste in yourself. It is only as good as the price-per-carat input; the calculator does the multiplication, not the grading. The Gemstone Weight Calculator solves a more physical problem: estimating the carat weight of a stone — mounted or loose — from its length, width, and depth, its specific gravity, and its cut, so you don’t have to unmount or weigh it to get a working number.

Getting the fit right

The Ring Size Converteris the practical odd one out: enter a finger measurement — inner diameter or circumference, in millimetres — and see it converted across US, UK/AU, and EU (ISO) sizing scales at once, useful whether you’re ordering a ring across borders or just double-checking a jeweler’s sizing chart.

Beyond the calculators

If you want context rather than a number, the Gems & Jewelry Museumis a browsable reference covering gemstones from diamond to emerald, the gold, platinum, and silver that hold them, the rings, necklaces, and crown jewels made from them, and the luxury watches and timepieces of horology — every entry, image, and fact sourced from Wikipedia and Wikimedia Commons. The blog and learn sections carry longer guides on the same topics for anyone who wants more than a calculator.

What this is, and isn’t

Every calculator here uses standard, published formulas and conventions — nothing proprietary, nothing hidden. But every result is an estimate built from the numbers you provide and a spot price at a moment in time; it is general informational content, not professional appraisal, gemological, or financial advice. Before you buy, sell, or insure a piece based on a number from this site, verify it with a certified appraiser or gemologist. RichPiece is not affiliated with any mint, grading laboratory, jeweler, or standards body it references, and the site runs on advertising, which is how it stays free. Questions, corrections, or a tool you think is missing? Get in touch.