Updated
Across 54 gold diamond necklaces and pendants scanned with GemstoneAI, the middle value was $930. Half came in between $450 and $2,100.
From 54 scans by 35 people in the GemstoneAI app, April 16, 2026 to November 6, 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.
Diamond necklaces and pendants in yellow gold had a middle value of $650 across 37 scans, against $1,200 in white gold across 15.
| Gold color | Middle value | Middle half | Scans |
|---|---|---|---|
| Yellow gold | $650 | $350 to $1,650 | 37 |
| White gold | $1,200 | $790 to $2,500 | 15 |
Sorted by the estimated size of the main stone. The size is the app's estimate from the photo, not a measurement.
| Main stone | Middle value | Middle half | Scans |
|---|---|---|---|
| Under 1/4 carat | $560 | $270 to $1,150 | 22 |
| 1/4 to 1/2 carat | $450 | $330 to $670 | 11 |
| 1/2 to 1 carat | $2,000 | $950 to $3,300 | 14 |
| 1 carat or more | $2,800 | $1,750 to $4,600 | 7 |
Diamond value turns on the 4Cs: carat, color, clarity and cut. A lab-grown diamond looks the same as a natural one and costs far less, and a photo cannot tell them apart, so a lab report settles it. Lab-grown vs natural diamond.
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 54 GemstoneAI scans, the middle first-read value was $930, and half came in between $450 and $2,100. 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.
In GemstoneAI scans, white gold ones had a middle value of $1,200 (15 scans) and yellow gold ones $650 (37 scans). At the same karat the two golds hold about the same amount of gold, so the gap reflects the stones and designs set in them, not the metal.
Gold diamond necklaces and pendants whose main stone the app estimated at 1 carat or more had a middle value of $2,800 across 7 GemstoneAI scans, with half between $1,750 and $4,600. Color, clarity and cut move a stone of the same size a long way.