GIA
Unheated
3.42 ct · Ratnapuracushion
Royal blue Ceylon sapphire
Pelmadulla alluvial pits
AcquisitionRs. 2,562,000
InspectView↗Ceylon sapphires & rubies — direct from Ratnapura
Certified, unheated stones. No theatre, no middlemen.
Natural corundum from the alluvial gravel beds of Sabaragamuwa Province. Each specimen is examined by GIA, GRS, or CGL before listing, with full spectroscopic confirmation of unheated status.
Inspect featured vault lots
6° 40′ N, 80° 24′ ERatnapura mine
0 treatmentsGuaranteed unheated
48-hourInsured dispatch
Lot stone-cushion-342 · Vault Inspection
GIA GIA 2235918472
Master Examination TrayAntique velvet inspection tray · Ratnapura Vault
sapphire · cushion cut
Royal blue Ceylon sapphire
Direct acquisitionRs. 2,562,000
Carat3.42 ct
Dimensions8.94 × 7.62 × 5.81 mm
TreatmentUnheated
Ratnapura, Sri Lanka · Pelmadulla alluvial pits
Fully insured delivery
Signature on arrival, covered to full value via armored courier transit.
Independent lab reports
GIA, GRS or CGL certificate physically matched and verified before listing.
30-day returns
Full refund, no questions asked. Return shipping and custody insurance prepaid.
Catalog
The vault
Select any unheated stone below to inspect full gemological coordinates in the preview panel.
GRS
Unheated
2.74 ct · Ratnapuraemerald
Sunset padparadscha sapphire
Kalu Ganga river gravels
AcquisitionRs. 3,416,000
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GRS
Unheated
3.16 ct · Ratnapuraoval
Pigeon blood Ceylon ruby
Kiriella artisanal shaft
AcquisitionRs. 2,943,250
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CGL
Unheated
2.85 ct · Ratnapuraemerald
Cornflower blue Ceylon sapphire
Balangoda valley deposit
AcquisitionRs. 1,753,750
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GIA
Unheated
3.08 ct · Ratnapurapear
Nocturnal violet Ceylon spinel
Okkampitiya gravel bed
AcquisitionRs. 1,174,250
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CGL
Unheated
4.80 ct · Ratnapuraround
The Star of Ratnapura sapphire
Wewelwatta gem gravels
AcquisitionRs. 2,196,000
InspectView↗Geological integrity
Provenance direct from the gem gravels of Ratnapura
Sri Lanka’s central highland basin has yielded unheated corundum for more than two millennia. We maintain direct relationships with licensed artisanal pit operators across the Kalu Ganga river system.
01
Alluvial gravel recovery
Stones originate exclusively from traditional artisanal gravel layers (Illam) in the valleys of Ratnapura, Pelmadulla, and Balangoda. Extracted under licenses issued by the National Gem and Jewellery Authority of Sri Lanka.
02
Unheated spectroscopic validation
Every rough and cut specimen undergoes microscopic inclusion study, Raman spectroscopy, and FTIR testing to verify unheated natural state. Thermal enhancement or diffusion voids listing eligibility immediately.
03
Direct custody transfer
We bypass brokerage tiers, intermediary trading houses, and auction markups. Stones travel directly from Ratnapura lapidary cut into our secure custody with complete chain-of-title documentation.
100%Unheated & untreated guarantee
NGJANational regulatory export compliance
3 LabsGIA, GRS, and CGL certification standard
0Middlemen markups between mine and buyer
Gemological Compendium & Wiki
The gemological archive
Open scientific study portal on Ceylon corundum, crystallography, and extraction geology. Curated with verified data from Wikipedia, GIA, LMHC, and SSEF.
Al₂O₃7 min study
Ceylon Blue Sapphire: Corundum Mineralogy & Physics
Trigonal (Hexagonal Scalenohedral R3̄c)
A peer-reviewed overview of natural corundum (Al₂O₃), focusing on the Fe²⁺-Ti⁴⁺ intervalence charge transfer mechanism responsible for Ceylon blue, undisturbed rutile (TiO₂) silk arrays, and FTIR diagnostic criteria.
Hardness9.0 Mohs
Refractive Index1.762
5 Verified SourcesStudy entry→
Al₂O₃ : Cr³⁺, Fe³⁺ / Color Centers6 min study
The Padparadscha Color Boundary: LMHC Standards
Trigonal (Hexagonal Scalenohedral)
A comprehensive analysis of the Laboratory Manual Harmonisation Committee (LMHC) criteria for padparadscha corundum, examining the spectral equilibrium between pink and orange hues, light-stability fading tests, and distinction from lattice diffusion.
Hardness9.0 Mohs
Refractive Index1.762
4 Verified SourcesStudy entry→
Al₂O₃ : Cr³⁺8 min study
Ceylon Ruby: Cr³⁺ Optics & UV Fluorescence Physics
Trigonal
A technical investigation into Ceylon rubies (Al₂O₃:Cr³⁺), their high chromium-to-iron ratio that triggers fiery ultraviolet fluorescence, optical pleochroism, and differences from basaltic deposits.
Hardness9.0 Mohs
Refractive Index1.762
4 Verified SourcesStudy entry→
MgAl₂O₄6 min study
Noble & Cobalt Spinel: Isometric Gemology
Isometric (Cubic Fd3̄m, Octahedral {111})
A study of natural spinel (MgAl₂O₄), focusing on its singly refractive isometric system, rare tetrahedral cobalt (Co²⁺) substitution, negative crystal octahedral chain inclusions, and historical confusion with rubies.
Hardness8.0 Mohs
Refractive Index1.718
3 Verified SourcesStudy entry→
Analytical: FTIR, Raman, UV-Vis, LA-ICP-MS9 min study
FTIR & Raman Spectroscopy: Heat Treatment Detection
Instrumental Diagnostic Physics
A laboratory breakdown of analytical spectrometry techniques used by GIA, SSEF, and GRS to verify natural unheated status in corundum, covering FTIR hydroxyl peaks, zircon Raman FWHM metrics, and trace element LA-ICP-MS profiling.
HardnessNon-destructive Analytical Testing Mohs
Refractive IndexPolarized
3 Verified SourcesStudy entry→
Geological: Precambrian Highland Complex Formations7 min study
Ratnapura Alluvial Geology: The 'Illam' Stratum
Alluvial Gravel Sediments ('Illam')
A geological field examination of the Sabaragamuwa basin, detailing the Precambrian metamorphism that produced the world's richest gem gravels ('illam'), traditional timber-supported pit shafts ('kula val'), and artisanal extraction ethics.
HardnessHydraulic Gravitational Concentration Mohs
Refractive IndexHeavy
4 Verified SourcesStudy entry→