Top 50 Diamonds by Certification Score in Singapore
Ranked by certificate rigour. GIA and AGS stones with complete grading, clear symmetry, and verified provenance come out on top. Pricing shown in SGD.
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 (SGD) |
|---|---|---|---|---|
| 1 | 8.04ct ROUND K SI1 | natural | 100 | $105,380 SGD |
| 2 | 8.03ct OVAL G VS2 | natural | 100 | $472,615 SGD |
| 3 | 7.03ct CUSHION F VS2 | natural | 100 | $436,467 SGD |
| 4 | 7.01ct PEAR I SI2 | natural | 100 | $125,533 SGD |
| 5 | 5.30ct HEART D FL | natural | 100 | $290,360 SGD |
| 6 | 5.01ct ROUND H SI2 | natural | 100 | $67,411 SGD |
| 7 | 4.03ct PRINCESS I VS2 | natural | 100 | $72,712 SGD |
| 8 | 4.01ct ROUND J SI1 | natural | 100 | $45,080 SGD |
| 9 | 4.01ct ROUND F IF | natural | 100 | $202,751 SGD |
| 10 | 3.52ct OVAL J SI1 | natural | 100 | $41,044 SGD |
| 11 | 3.33ct RADIANT L VS1 | natural | 100 | $37,006 SGD |
| 12 | 3.05ct OVAL K SI1 | natural | 100 | $28,761 SGD |
| 13 | 3.04ct HEART I SI2 | natural | 100 | $16,400 SGD |
| 14 | 3.04ct OVAL J SI2 | natural | 100 | $21,255 SGD |
| 15 | 3.02ct ROUND F VS1 | natural | 100 | $73,164 SGD |
| 16 | 3.01ct PEAR H SI2 | natural | 100 | $11,364 SGD |
| 17 | 3.01ct CUSHION J VS2 | natural | 100 | $14,440 SGD |
| 18 | 3.01ct OVAL I SI2 | natural | 100 | $20,147 SGD |
| 19 | 3.01ct OVAL K SI1 | natural | 100 | $21,794 SGD |
| 20 | 3.01ct OVAL J SI2 | natural | 100 | $25,723 SGD |
| 21 | 3.01ct ROUND H SI2 | natural | 100 | $26,640 SGD |
| 22 | 3.01ct ROUND F SI2 | natural | 100 | $31,373 SGD |
| 23 | 3.01ct PEAR F SI2 | natural | 100 | $33,187 SGD |
| 24 | 3.01ct OVAL F SI1 | natural | 100 | $54,493 SGD |
| 25 | 3.01ct ROUND G VS2 | natural | 100 | $69,340 SGD |
| 26 | 2.68ct CUSHION D VS1 | natural | 100 | $32,072 SGD |
| 27 | 2.67ct OVAL L SI2 | natural | 100 | $19,547 SGD |
| 28 | 2.52ct OVAL D VS1 | natural | 100 | $39,253 SGD |
| 29 | 2.51ct OVAL D VVS1 | natural | 100 | $48,964 SGD |
| 30 | 2.42ct ROUND I VVS1 | natural | 100 | $19,280 SGD |
| 31 | 2.34ct ROUND G SI2 | natural | 100 | $11,160 SGD |
| 32 | 2.04ct ROUND I SI1 | natural | 100 | $18,343 SGD |
| 33 | 2.03ct EMERALD D VVS1 | natural | 100 | $47,186 SGD |
| 34 | 2.02ct ROUND J I1 | natural | 100 | $2,656 SGD |
| 35 | 2.02ct PEAR F VS1 | natural | 100 | $22,288 SGD |
| 36 | 2.02ct CUSHION F SI1 | natural | 100 | $22,567 SGD |
| 37 | 2.01ct RADIANT H SI2 | natural | 100 | $7,613 SGD |
| 38 | 2.01ct CUSHION H VS2 | natural | 100 | $8,093 SGD |
| 39 | 2.01ct CUSHION H VS2 | natural | 100 | $8,187 SGD |
| 40 | 2.01ct PEAR H SI2 | natural | 100 | $10,347 SGD |
| 41 | 2.01ct ROUND G SI2 | natural | 100 | $10,771 SGD |
| 42 | 2.01ct ROUND H SI1 | natural | 100 | $11,407 SGD |
| 43 | 2.01ct ASSCHER I SI1 | natural | 100 | $13,245 SGD |
| 44 | 2.01ct HEART I VS2 | natural | 100 | $13,653 SGD |
| 45 | 2.01ct ROUND J SI2 | natural | 100 | $13,720 SGD |
| 46 | 2.01ct OVAL I VVS2 | natural | 100 | $17,480 SGD |
| 47 | 2.01ct ROUND E SI2 | natural | 100 | $19,083 SGD |
| 48 | 2.01ct ROUND G SI2 | natural | 100 | $19,247 SGD |
| 49 | 2.01ct ROUND D SI2 | natural | 100 | $22,403 SGD |
| 50 | 2.01ct ROUND G SI2 | natural | 100 | $22,853 SGD |
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