Free Resources

Collector's Tools

Free tools for buyers, collectors, and dealers. All estimates are for reference only — not appraisals.

Diamond Price Estimator

Estimate a diamond's retail market range. Enter carat, color, clarity, shape, and cut for an instant price window.

Market range estimates for ruby, sapphire, emerald, Paraíba tourmaline, alexandrite, spinel, and tanzanite.

Answer 5 questions about a piece and discover its likely era — Georgian, Art Deco, Retro, and more.

Search stamps and marks from the UK, France, Italy, Germany, USA, Russia, Switzerland, and Austria.

Convert between US, UK, EU, and Japanese ring sizes with diameter and circumference references.

Calculate the melt value of gold, silver, or platinum jewelry using live spot prices.