Comparable Sales

by GemstoneAI

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Auditable resale comparables

The defensible value behind every stone.

Pull real secondary-market comparables for any gem or piece of jewelry, sold and asking prices from specialist dealers, auction houses, and vetted marketplaces. Get a weighted value range you can stand behind in an appraisal, with every figure linked to its source.

Sign in to the tool How it works

Sold vs. asking labeled. Source links on every comp. Export to PDF, JSON, or your own systems.

2.05 ct unheated Ceylon sapphire

High

Estimated value

$8,400

Range $6,200 – $11,500 · 9 comps · 4 sold

  • Unheated 2.1ct Ceylon, cushion

    thenaturalsapphirecompany.com

    close$9,950Ask

  • GRS unheated 1.98ct blue, Sotheby's

    sothebys.com

    close$7,200Sold

  • 2.0ct Ceylon blue, heated

    leibish.com

    loose$3,400Ask

Built for the way appraisers actually defend a number.

Credible sources first

Specialist gem dealers and auction houses lead the search; thin marketplace listings are filtered out, not averaged in.

Sold vs. asking, weighted

Realized prices carry more weight than asking. Off-tier listings are flagged and de-weighted so a few outliers can't distort the range.

A range with a confidence

A tier-anchored low / fair / high with a stated confidence level, not a single number pretending to certainty.

Export the way you work

A branded PDF comp sheet for the file, JSON for your systems, or a direct hand-off to a partner platform.

Every comp links to a verified source.

No invented listings, no guessed prices. If a figure can't be confirmed on the live web, it doesn't make the sheet.

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