Gemstones · Certified

Independently Certified Gemstones

Every stone in our certified collection is accompanied by a report from a leading gemological laboratory — GRS, SSEF, Gübelin, GIA, or AGL — verifying its authenticity, origin, and treatment status.

Book a Gemstone Viewing
Shape
Gem Type
Colour
Mine of Origin
Carat · 0.00 – 30.00 ct
Price · £0 – £1,400,000
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№ GS-027 · 40× zoom
NO HEAT
Round Garnet£1,680
2.51
Carat
Red
Colour
—
Clarity
Tanzania
Origin
Round
Shape
No Treatment
Treatment
GIA
Lab
—
Ratio
M:7.80 × 7.80 × 4.80R:—№ GIA-6235401
№ GS-025 · 40× zoom
HEATED
Oval Morganite£2,220
5.12
Carat
Pink
Colour
—
Clarity
Madagascar
Origin
Oval
Shape
Heated
Treatment
GIA
Lab
—
Ratio
M:12.40 × 9.20 × 6.10R:—№ GIA-6235280
№ GS-006 · 40× zoom
HEATED
Cushion Sapphire£2,580
1.51
Carat
Blue
Colour
—
Clarity
Madagascar
Origin
Cushion
Shape
Heated
Treatment
GIA
Lab
—
Ratio
M:7.10 × 6.20 × 3.80R:—№ GIA-6234221
№ GS-024 · 40× zoom
HEATED
Emerald Aquamarine£2,880
4.81
Carat
Blue
Colour
—
Clarity
Brazil
Origin
Emerald
Shape
Heated
Treatment
GIA
Lab
—
Ratio
M:11.20 × 8.40 × 5.80R:—№ GIA-6235241
№ GS-005 · 40× zoom
HEATED
Round Sapphire£4,080
1.82
Carat
Blue
Colour
—
Clarity
Sri Lanka
Origin
Round
Shape
Heated
Treatment
GIA
Lab
—
Ratio
M:7.40 × 7.40 × 4.50R:—№ GIA-6234120
№ GS-019 · 40× zoom
NO HEAT
Emerald Tourmaline£5,760
5.42
Carat
Green
Colour
—
Clarity
Mozambique
Origin
Emerald
Shape
No Treatment
Treatment
GIA
Lab
—
Ratio
M:11.40 × 8.60 × 6.20R:—№ GIA-6235012
№ GS-023 · 40× zoom
HEATED
Oval Tanzanite£5,760
6.42
Carat
Violet
Colour
—
Clarity
Tanzania
Origin
Oval
Shape
Heated
Treatment
GIA
Lab
—
Ratio
M:12.40 × 9.10 × 6.20R:—№ GIA-6235202
№ GS-016 · 40× zoom
OIL · MINOR
Pear Emerald£7,680
1.85
Carat
Green
Colour
—
Clarity
Zambia
Origin
Pear
Shape
Oiled · Minor
Treatment
GRS
Lab
—
Ratio
M:9.40 × 5.80 × 3.90R:—№ GRS-2024-015902
№ GS-004 · 40× zoom
HEATED
Oval Sapphire£8,160
2.51
Carat
Blue
Colour
—
Clarity
Sri Lanka
Origin
Oval
Shape
Heated
Treatment
GRS
Lab
—
Ratio
M:9.10 × 6.80 × 4.30R:—№ GRS-2024-014020
№ GS-022 · 40× zoom
NO HEAT
Cushion Tsavorite£8,640
2.84
Carat
Green
Colour
—
Clarity
Tanzania
Origin
Cushion
Shape
No Treatment
Treatment
GIA
Lab
—
Ratio
M:8.10 × 7.40 × 5.10R:—№ GIA-6235104
№ GS-012 · 40× zoom
HEATED
Cushion Ruby£10,080
1.50
Carat
Red
Colour
—
Clarity
Mozambique
Origin
Cushion
Shape
Heated
Treatment
GRS
Lab
—
Ratio
M:6.80 × 6.20 × 3.90R:—№ GRS-2024-015401
№ GS-007 · 40× zoom
HEATED
Oval Sapphire£10,200
2.35
Carat
Pink
Colour
—
Clarity
Madagascar
Origin
Oval
Shape
Heated
Treatment
GRS
Lab
—
Ratio
M:8.90 × 6.80 × 4.20R:—№ GRS-2024-014501
№ GS-018 · 40× zoom
NO HEAT
★ Myanmar
Oval Spinel£10,560
1.84
Carat
Pink
Colour
—
Clarity
Myanmar
Origin
Oval
Shape
No Treatment
Treatment
SSEF
Lab
—
Ratio
M:8.40 × 6.30 × 4.10R:—№ SSEF-118620
№ GS-008 · 40× zoom
NO HEAT
Cushion Sapphire£17,040
1.84
Carat
Pink
Colour
—
Clarity
Sri Lanka
Origin
Cushion
Shape
No Treatment
Treatment
SSEF
Lab
—
Ratio
M:7.20 × 6.40 × 3.90R:—№ SSEF-118402
№ GS-017 · 40× zoom
NO HEAT
★ Myanmar
Cushion Spinel£17,040
2.51
Carat
Red
Colour
—
Clarity
Myanmar
Origin
Cushion
Shape
No Treatment
Treatment
GRS
Lab
—
Ratio
M:8.10 × 7.20 × 4.50R:—№ GRS-2024-016021
№ GS-015 · 40× zoom
OIL · INSIG.
Cushion Emerald£17,760
4.05
Carat
Green
Colour
—
Clarity
Zambia
Origin
Cushion
Shape
Oiled · Insignificant
Treatment
GRS
Lab
—
Ratio
M:9.20 × 8.60 × 5.40R:—№ GRS-2024-015820
№ GS-026 · 40× zoom
NO HEAT
Cushion Alexandrite£22,080
1.21
Carat
Bi-color
Colour
—
Clarity
Brazil
Origin
Cushion
Shape
No Treatment
Treatment
GIA
Lab
—
Ratio
M:6.40 × 5.80 × 3.90R:—№ GIA-6235331
№ GS-011 · 40× zoom
HEATED
★ Myanmar
Oval Ruby£26,880
1.82
Carat
Red
Colour
—
Clarity
Myanmar
Origin
Oval
Shape
Heated
Treatment
GRS
Lab
—
Ratio
M:8.40 × 6.20 × 3.80R:—№ GRS-2024-015284
№ GS-014 · 40× zoom
OIL · MINOR
★ Colombia
Emerald Emerald£29,760
2.41
Carat
Green
Colour
—
Clarity
Colombia
Origin
Emerald
Shape
Oiled · Minor
Treatment
AGL
Lab
—
Ratio
M:8.40 × 6.80 × 4.50R:—№ AGL-CS-92041
№ GS-009 · 40× zoom
HEATED
Cushion Padparadscha£34,200
2.05
Carat
Pink-Orange
Colour
—
Clarity
Sri Lanka
Origin
Cushion
Shape
Heated
Treatment
GRS
Lab
—
Ratio
M:7.40 × 6.80 × 4.20R:—№ GRS-2024-015018
№ GS-020 · 40× zoom
HEATED
Oval Paraíba£46,080
1.84
Carat
Cyan-Blue
Colour
—
Clarity
Mozambique
Origin
Oval
Shape
Heated
Treatment
GRS
Lab
—
Ratio
M:8.40 × 6.20 × 4.10R:—№ GRS-2024-016402
№ GS-013 · 40× zoom
OIL · INSIG.
★ Colombia
Emerald Emerald£93,600
3.18
Carat
Green
Colour
—
Clarity
Colombia
Origin
Emerald
Shape
Oiled · Insignificant
Treatment
GUB
Lab
—
Ratio
M:9.80 × 7.40 × 5.10R:—№ GUB-23-1182
№ GS-003 · 40× zoom
NO HEAT
★ Myanmar
Cushion Sapphire£100,800
5.21
Carat
Blue
Colour
—
Clarity
Myanmar
Origin
Cushion
Shape
No Treatment
Treatment
GRS
Lab
—
Ratio
M:10.10 × 9.40 × 5.80R:—№ GRS-2024-013500
№ GS-021 · 40× zoom
NO HEAT
Cushion Paraíba£100,800
2.51
Carat
Cyan-Blue
Colour
—
Clarity
Brazil
Origin
Cushion
Shape
No Treatment
Treatment
SSEF
Lab
—
Ratio
M:8.40 × 7.80 × 5.20R:—№ SSEF-118702
№ GS-010 · 40× zoom
NO HEAT
★ Myanmar
Cushion Ruby£115,200
2.04
Carat
Red
Colour
—
Clarity
Myanmar
Origin
Cushion
Shape
No Treatment
Treatment
GUB
Lab
—
Ratio
M:7.50 × 6.80 × 4.10R:—№ GUB-23-1148
№ GS-001 · 40× zoom
NO HEAT
★ Kashmir
Cushion Sapphire£170,400
3.04
Carat
Blue
Colour
—
Clarity
Kashmir
Origin
Cushion
Shape
No Treatment
Treatment
GUB
Lab
—
Ratio
M:8.50 × 7.10 × 5.20R:—№ GUB-23-1102
№ GS-002 · 40× zoom
NO HEAT
★ Kashmir
Oval Sapphire£201,600
4.12
Carat
Blue
Colour
—
Clarity
Kashmir
Origin
Oval
Shape
No Treatment
Treatment
SSEF
Lab
—
Ratio
M:10.20 × 8.30 × 5.40R:—№ SSEF-118245

Why Certification Matters When Buying Gemstones

A gemological certificate is your assurance that a gemstone is exactly what it is claimed to be. For coloured gemstones — rubies, sapphires, emeralds, and other precious stones — an independent laboratory report confirms the species, variety, geographic origin, and any treatments the stone has undergone. Without this documentation, buyers have no way to verify the claims made by a seller.

At Reve Diamonds, we only offer certified stones from the world's most respected gemological laboratories, and our team can guide you through interpreting any certificate to ensure you make a fully informed purchase.

Leading Gemstone Laboratories

  • GRS (GemResearch Swisslab): the gold standard for ruby, sapphire, and emerald origin determination.
  • SSEF (Swiss Gemmological Institute): renowned for "pigeon blood" and "royal blue" quality designations.
  • Gübelin Gem Lab: one of the oldest and most respected coloured stone laboratories.
  • GIA (Gemological Institute of America): widely recognised; strong for sapphires and alexandrite.
  • AGL (American Gemological Laboratories): specialist in coloured stones and enhancements disclosure.

FAQs — Certified Gemstones

Do all gemstones need a certificate?

For high-value rubies, sapphires, and emeralds we strongly recommend a certificate. For more modestly priced stones, certification adds cost and may not always be warranted — our team can advise case by case.

Can I get a certificate for a stone I already own?

Yes. We can arrange independent certification through our laboratory partners for stones you already own, whether purchased from us or elsewhere.

Gemstones · Certified

Independently Certified Gemstones

Every stone in our certified collection is accompanied by a report from a leading gemological laboratory — GRS, SSEF, Gübelin, GIA, or AGL — verifying its authenticity, origin, and treatment status.

Book a Gemstone Viewing
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Why Certification Matters When Buying Gemstones

A gemological certificate is your assurance that a gemstone is exactly what it is claimed to be. For coloured gemstones — rubies, sapphires, emeralds, and other precious stones — an independent laboratory report confirms the species, variety, geographic origin, and any treatments the stone has undergone. Without this documentation, buyers have no way to verify the claims made by a seller.

At Reve Diamonds, we only offer certified stones from the world's most respected gemological laboratories, and our team can guide you through interpreting any certificate to ensure you make a fully informed purchase.

Leading Gemstone Laboratories

  • GRS (GemResearch Swisslab): the gold standard for ruby, sapphire, and emerald origin determination.
  • SSEF (Swiss Gemmological Institute): renowned for "pigeon blood" and "royal blue" quality designations.
  • Gübelin Gem Lab: one of the oldest and most respected coloured stone laboratories.
  • GIA (Gemological Institute of America): widely recognised; strong for sapphires and alexandrite.
  • AGL (American Gemological Laboratories): specialist in coloured stones and enhancements disclosure.

FAQs — Certified Gemstones

Do all gemstones need a certificate?

For high-value rubies, sapphires, and emeralds we strongly recommend a certificate. For more modestly priced stones, certification adds cost and may not always be warranted — our team can advise case by case.

Can I get a certificate for a stone I already own?

Yes. We can arrange independent certification through our laboratory partners for stones you already own, whether purchased from us or elsewhere.

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