Diamond calculator

How much is your diamond worth?

A diamond price calculator estimates the wholesale buy-back value of your diamond using the four Cs and current Rapaport-derived market prices. No personal details required.

Shape
Carat 1.00ct
0.20ct 5.00ct

Don’t know the grade?

Indicative buy-back range
£4,050 – £4,950

1.00ct round · G colour · VS1 clarity · based on GIA Triple-Ex, Nil-Fluorescence pricing.

Final offer depends on actual cut grade, fluorescence, and any treatments — confirmed in person.

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Sample valuations

Recent buy-back examples.

A guide to what we’ve recently paid for stones in common specifications. Refreshed quarterly against current Rapaport pricing.

1.00ct round, F, VS1, GIA Triple-Ex
£4,200 – £5,400
0.50ct round, G, VS2, GIA
£900 – £1,200
2.00ct cushion, H, SI1, GIA
£6,500 – £8,200
1.50ct oval, F, VVS2, GIA
£8,400 – £10,600
Calculator FAQs

About this tool.

A diamond price calculator estimates the wholesale buy-back value of your diamond using the four Cs — carat, colour, clarity and cut — together with current Rapaport-derived market prices. Our calculator is based on GIA Triple-Ex, Nil-Fluorescence pricing for round brilliants, with shape adjustments applied to fancy cuts.

The range reflects the variables we can’t see from the form alone — actual cut grade, fluorescence, polish, symmetry, and any treatments. Once your stone is in our hands we confirm a single firm price, in writing.

Use the ‘I don’t know’ defaults (G colour, VS2 clarity) for a safe central estimate. Or send a photo on WhatsApp and we’ll help identify the grade for free.

We do buy uncertified stones, but typically at 10–20% below the certified equivalent — the discount reflects the trade risk of grading without an independent report.

We refresh the calculator’s underlying data quarterly against Rapaport price lists and our own daily Rapnet trading. Last updated: May 2026.