We Test and Grade Gemstones

Photo: polysynthetic twinning observed in an unheated Madagascar sapphire

NATURAL DIAMONDS - COLOURLESS AND COLOURED

Comparison chart showing report evaluation criteria for concise and standard reports, with green checkmarks indicating inclusion and red crosses indicating exclusion for each criterion.

NATURAL COLOURED GEMSTONES

For organic materials such as agarwood, pearls, shells, bones, amber etc, please click here

Comparison chart of report details for concise and standard reports, including various grading and identification categories, marked with checkmarks and crosses.

Current List of GemRight Colour Distinctions Provided
(for fine eligible gemstones)

Untreated Rubies

“Pigeon’s Blood” - Red, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, strong to very strong red fluorescence under LWUV

“Scarlet Red” - Red, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, none to medium red fluorescence under LWUV

Untreated Emeralds

“Muzo Green” - Green to very slightly bluish Green, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, from Colombia, colour mainly due to presence of chromium

“Verdant Green” - Green to very slightly bluish Green, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, from other origins

Untreated Sapphires

“Royal Blue” - Blue to violetish Blue, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, no visible colour zoning

Padparadscha “Sunrise” - orangy Pink, medium tone, vivid saturation, excellent to exceptional brilliancy, no visible colour zoning

Padparadscha “Sunset” - pinkish Orange, medium tone, vivid saturation, excellent to exceptional brilliancy, no visible colour zoning

“Canary Yellow” - Yellow, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, no visible colour zoning

“Hot Pink” - Pink, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, no visible colour zoning

Untreated Spinels

“Jedi Red/Pink” - Red or Pink, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, strong to very strong fluorescence under LWUV

“Scarlet Red” - Red, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, none to medium fluorescence under LWUV

“Hot Pink” - Pink, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, none to medium fluorescence under LWUV

“Cobalt Blue” - Blue, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy, colour due mainly to presence of cobalt

Aquamarines

“Santa Maria” - Blue, medium to medium dark tone, vivid saturation, excellent to exceptional brilliancy

Untreated Fei Cui Jadeites (Type A)

“Imperial Green” - Green, medium to medium dark tone, vivid saturation, excellent to exceptional evenness, glassy to icy types

Copper and Manganese-bearing Tourmalines

“Neon Paraiba” - very slightly bluish Green to violetish Blue, medium tone, vivid saturation, exceptional brilliancy

“Paraiba” - very slightly bluish Green to violetish Blue, medium tone, vivid saturation, very good to exceptional brilliancy

Untreated Cat’s Eye Chrysoberyl

“Honey” - greenish Yellow, medium tone, vivid saturation, very good to excellent chatoyancy, distinct milk-and-honey optical effect

for the gemstones and jewellery buyers out there, insisting on our reports is insisting on a peace of mind for your precious purchase.

For businesses in the gems and jewellery trade, insisting on our services is insisting on building lasting credibility that differentiates.

Teo Wei Hong, G.G., Founder and Gemologist

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