What’s your gemstone really worth?
Honest price ranges, quality grading in plain English, and where to buy without getting ripped off. No inflated “retail” anchors. No paid rankings.
Value, graded like an appraiser
Every guide ends with a clear verdict, a value rating out of five, and the fair price range — never a single tempting figure. All value guides →
How we price a stone
Transparent, repeatable, and impossible to buy your way into.
The 4 C’s, decoded
Colour, clarity, cut, carat — what each one really adds or subtracts in dollars.
Real market ranges
Dealer, auction and retail data — published as a range, never one tempting figure.
Treatments & fakes
Heated, dyed, glass-filled, lab-grown — and how each one moves a fair price.
No paid rankings
Sellers can’t buy a better verdict. Affiliate links are labelled and never sway a score.
Scam Watch — 5 red flags before you pay
- “70% off retail.” The retail anchor is usually invented. Judge the price, not the discount.
- No weight or origin. A fair seller always gives carat, treatment and source.
- “Too vivid” colour, low price. Often dyed or glass-filled — ask for a lab report.
- Vague “certificate.” Know which labs actually mean something.
- Countdown timers & pressure. A fair price doesn’t expire in 10 minutes.
What is a gemstone actually worth?
Gemstone pricing can feel like a black box, but it isn’t. The value of almost any coloured stone comes down to four factors — colour, clarity, cut and carat weight — plus whether it has been treated and where it came from. For most coloured gems, colour does the heavy lifting: a deeper, purer, more saturated hue can be worth many times a pale version of the same stone. Size matters too, but only once colour is accounted for, and rarity multiplies both.
Fair Carat exists to translate that into plain English and honest price ranges, so you can tell in seconds whether a stone is fairly priced. We don’t sell stones and we don’t take payment for rankings. Every value guide triangulates dealer, marketplace and auction prices and publishes a range — never a single tempting figure — alongside a clear verdict and a value rating out of five. We also flag the treatments and lookalikes that quietly change a fair price, from heated and dyed material to glass imitations and lab-grown stones. New to this? Start with the aquamarine, amethyst and garnet guides.
Gemstone value guides
Gemstone value, answered
The questions buyers ask us most — answered in plain English.
How is a gemstone’s value determined?
By four core factors — colour, clarity, cut and carat weight — together with treatment and origin. For coloured stones, colour saturation is usually the single biggest price driver, followed by size. Whether a stone is natural, treated or lab-grown, and where it was mined, then adjusts the figure up or down.
Does heat treatment make a gemstone worthless?
No. Heating is a standard, stable and widely accepted treatment for many gems (aquamarine, citrine, tanzanite and more). It shouldn’t scare you — but it should be disclosed, and it usually means the stone is worth less than an untreated equivalent of the same quality.
What does “70% off retail” actually mean?
Usually very little. The “retail” anchor is often invented to make a discount look dramatic. Ignore the percentage and judge the actual asking price against a fair per-carat range for that stone, colour and size.
Are lab-grown gemstones worth anything?
Yes — they’re real gemstones with the same chemistry as natural stones, and they’re a legitimate, attractive choice. They simply cost far less than natural equivalents, so they should always be priced and disclosed as lab-grown, not sold at natural prices.
What’s the most important value factor for coloured stones?
Colour — specifically saturation and tone. A vivid, pure hue can be worth many times a pale, washed-out stone of the same type, size and clarity. Learn to judge colour in daylight and you’ll spot most over-pricing instantly.
How can I avoid overpaying for a gemstone?
Always get the carat weight, treatment and origin in writing, judge the colour yourself, and compare the price against a fair per-carat range rather than a “discount.” For anything high-value, ask for a report from a recognised lab and consider a certified appraisal.