Updated
Across 10 gold onyx rings scanned with GemstoneAI, the middle value was $580. Half came in between $380 and $880.
From 10 scans by 10 people in the GemstoneAI app, July 1, 2026 to November 7, 2026, with test and staff accounts left out and no one person making up more than a quarter of them. Each figure is a first-read fair market estimate from photos, about what a mainstream jeweler would sell a similar item for. They are not appraisals, sale prices or offers. How GemstoneAI values jewelry.
Black onyx is almost always dyed chalcedony and costs little as a stone, so the gold or silver around it carries most of the value.
In gold, the metal sets a floor. 14K gold is worth about $76.28 a gram as metal today, so 5 grams of 14K holds about $381.39 of gold. Read the stamp, usually inside a band, on a clasp or on an earring post: 14K or 585, 18K or 750, 10K or 417. Without a readable stamp, GemstoneAI usually prices gold as 14K. GP, GF or HGE after the karat means plated or filled, which holds far less gold.
A signed maker, age and good condition push a value toward the top of the range. Small or included stones, heavy wear and missing stones pull it toward the bottom.
Photograph it, then take a close-up of the stamp. GemstoneAI identifies the stone, reads the metal and gives a first-read value with similar items for sale. Your first scan is free.
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Across 10 GemstoneAI scans, the middle first-read value was $580, and half came in between $380 and $880. Yours depends on the stone's size and quality, the metal and its weight, and the maker.
Less than these figures. They are fair market estimates, about what a mainstream jeweler would sell a similar item for, and dealers and pawn shops buy below that. Know the melt value of the gold first, since no fair offer should fall far below it.