Top 50 Diamonds by Certification Score in United Kingdom
Ranked by certificate rigour. GIA and AGS stones with complete grading, clear symmetry, and verified provenance come out on top. Pricing shown in GBP.
Last updated 31 July 2026 · Based on 50 active listings ranked by certification
What Certification Score Rewards
Certification score measures the rigour and completeness of the grading report behind each diamond. It weights the grading lab (GIA and AGS lead; IGI and HRD follow; newer or less-consistent labs are lower), the presence of a polish and symmetry grade (required for Excellent-cut claims), and the completeness of the proportions data. It's not measuring the diamond itself. It's measuring how confident you can be that the grades on paper match what you'll receive.
Use this list when you're buying at a price point where certification rigour matters most. Say, above $10,000, or when the stone will be insured, resold, or given as a gift with a certificate presentation. The top of this list is where the paper trail is strongest: full GIA reports with polish and symmetry grades, complete measurement data, and a clean provenance.
A high certification score doesn't mean the stone is beautiful. It just means the grading is trustworthy. Cross-reference with quality score for stones that are both well-documented and well-made. For lab-grown, IGI tops this list more often than GIA because IGI has become the default lab-grown certifier and has the most complete reports for that segment.
| # | Diamond | Origin | Score | Lowest Price (GBP) |
|---|---|---|---|---|
| 1 | 8.04ct ROUND K SI1 | natural | 100 | £62,232 GBP |
| 2 | 8.03ct OVAL G VS2 | natural | 100 | £279,104 GBP |
| 3 | 7.03ct CUSHION F VS2 | natural | 100 | £257,756 GBP |
| 4 | 7.01ct PEAR I SI2 | natural | 100 | £74,134 GBP |
| 5 | 6.06ct OVAL D VVS2 | lab grown | 100 | £11,665 GBP |
| 6 | 5.30ct HEART D FL | natural | 100 | £171,473 GBP |
| 7 | 5.12ct OVAL E VVS2 | lab grown | 100 | £8,164 GBP |
| 8 | 5.11ct HEART D IF | lab grown | 100 | £10,757 GBP |
| 9 | 5.06ct OVAL E IF | lab grown | 100 | £10,651 GBP |
| 10 | 5.04ct HEART E IF | lab grown | 100 | £8,943 GBP |
| 11 | 5.01ct ROUND H SI2 | natural | 100 | £39,809 GBP |
| 12 | 4.71ct HEART D IF | lab grown | 100 | £7,215 GBP |
| 13 | 4.58ct ASSCHER E VVS2 | lab grown | 100 | £6,634 GBP |
| 14 | 4.56ct OVAL D VVS1 | lab grown | 100 | £9,244 GBP |
| 15 | 4.24ct ROUND D VVS1 | lab grown | 100 | £3,702 GBP |
| 16 | 4.22ct ROUND D VVS1 | lab grown | 100 | £3,685 GBP |
| 17 | 4.21ct OVAL D VVS1 | lab grown | 100 | £5,284 GBP |
| 18 | 4.16ct HEART D IF | lab grown | 100 | £6,613 GBP |
| 19 | 4.09ct OVAL F VVS2 | lab grown | 100 | £4,441 GBP |
| 20 | 4.07ct OVAL D VS1 | lab grown | 100 | £7,001 GBP |
| 21 | 4.03ct PRINCESS I VS2 | natural | 100 | £42,940 GBP |
| 22 | 4.01ct ROUND J SI1 | natural | 100 | £26,622 GBP |
| 23 | 4.01ct ROUND F IF | natural | 100 | £119,735 GBP |
| 24 | 3.96ct OVAL D FL | lab grown | 100 | £11,423 GBP |
| 25 | 3.91ct OVAL E VS1 | lab grown | 100 | £1,391 GBP |
| 26 | 3.79ct ASSCHER D FL | lab grown | 100 | £11,226 GBP |
| 27 | 3.67ct PRINCESS D VVS1 | lab grown | 100 | £3,277 GBP |
| 28 | 3.62ct ASSCHER G VVS2 | lab grown | 100 | £543 GBP |
| 29 | 3.60ct OVAL E VVS1 | lab grown | 100 | £6,205 GBP |
| 30 | 3.57ct HEART D IF | lab grown | 100 | £4,265 GBP |
| 31 | 3.55ct ASSCHER F VS1 | lab grown | 100 | £4,413 GBP |
| 32 | 3.52ct OVAL E VS2 | lab grown | 100 | £1,426 GBP |
| 33 | 3.52ct OVAL J SI1 | natural | 100 | £24,239 GBP |
| 34 | 3.51ct CUSHION E VS2 | lab grown | 100 | £1,394 GBP |
| 35 | 3.42ct ROUND E VVS1 | lab grown | 100 | £2,300 GBP |
| 36 | 3.37ct PRINCESS E VS2 | lab grown | 100 | £3,992 GBP |
| 37 | 3.37ct OVAL E VVS2 | lab grown | 100 | £5,039 GBP |
| 38 | 3.33ct RADIANT L VS1 | natural | 100 | £21,854 GBP |
| 39 | 3.28ct ROUND F VS1 | lab grown | 100 | £1,033 GBP |
| 40 | 3.28ct PRINCESS E VVS2 | lab grown | 100 | £4,886 GBP |
| 41 | 3.26ct OVAL E IF | lab grown | 100 | £3,560 GBP |
| 42 | 3.17ct ROUND D VVS1 | lab grown | 100 | £1,655 GBP |
| 43 | 3.09ct CUSHION D VVS2 | lab grown | 100 | £2,882 GBP |
| 44 | 3.07ct OVAL E VS2 | lab grown | 100 | £976 GBP |
| 45 | 3.06ct ROUND E VS1 | lab grown | 100 | £11,398 GBP |
| 46 | 3.06ct ROUND D VS2 | lab grown | 100 | £15,270 GBP |
| 47 | 3.05ct OVAL E VS2 | lab grown | 100 | £672 GBP |
| 48 | 3.05ct OVAL K SI1 | natural | 100 | £16,985 GBP |
| 49 | 3.04ct ROUND D VVS1 | lab grown | 100 | £2,135 GBP |
| 50 | 3.04ct HEART I SI2 | natural | 100 | £9,685 GBP |
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