Polychrome sapphire 1,70ct Madagascar, GGTL, MGC, MELIKIAN
Sapphire 1,70ct Madagascar, GGTL, MGC, MELIKIAN
GEMOLOGICAL REPORT № 130
Gemologist Olga Melikian | WA: https://wa.me/79990437349 23/12/2025
Telegram: @olgamelikianofficial | https://melikianjewelry.com
Weight:..………………………………….………………..…… 1.70 ct
Stone Measurements: …………………….…… 7.18x6.19x4.09 mm
Сut: ……………………………………………..…………..….. Radiant
Color: ……………. Blue, Yellowish green | medium color saturation
Clarity: …………………………………………….………… loop clean
IDENTIFICATION: …… Natural SAPPHIRE (variety of corundum)
TRADE NAME: …………………….…. POLYCHROME SAPPHIRE
Geographic Origin: ……………..……………..………… Madagascar
Treatment: ………………………….. no indications of any treatment
Information about POLYCHROME SAPPHIRE from Madagascar:
In the south of Madagascar, near the city of Tranomaro, rare polychrome sapphires are found. There are usually yellow-green colors. If the stone contains three colors, it is rarer and more valuable.
10x glass: The stone is clean when examined with the naked eye and
a 10x magnifying glass. There are no cracks, chips, or naifs.
Refractive Index: ……………………….………….… 1.764-1.772, 0.008
Polariscope: ……………………………………………………anisotropic,
polychromy is clearly visible: from moderately blue to yellowish green
Dichroscope: ………………………………………………………………..
UV fluorescence: ………….……………………….…… no fluorescence
Chelsea Filter: ………………………………………..……..………..… no
Color change | Alexandrite effect (daylight | artificial light): …..….…no
Microscope: no indications of high temperature heating. The crystal growth zones are clearly visible, no cracks and chips.
Special properties:
Opalescence | adularescence | iridescence ………………………No
Cats eye effect…………………………………………….……….…No
Asterism……………………………………….………………………No
DETAILED GEMOLOGICAL COMMENT
To accurately determine the mining region, the gem report should be supplemented with Raman microscope study, obtaining the spectrum of this Polychrome sapphire, and comparing it with the base spectrum of polychrome sapphires from Madagascar.
Considering the characteristics of this Polychrome Sapphire:
Weight: ……..……………………………….…………….…….. 1.70 ct
Сut: ……………………………………………..……….….…. Radiant
Color: …………..… Blue, Yellowish green | medium color saturation
Clarity: ……………………………………………………..… loop clean
Geographic Origin: ………………………….…………… Madagascar
Treatment: ………………………..… no indications of any treatment
Recommended market value corridor (retail price) of Polychrome Sapphire from Madagascar, weighing more than 1.5 carat, Blue, Yellowish green | medium color saturation, as of 23.12.2025:
1500-1700 $ per 1 ct
Note: the recommended market value corridor in indicated on this date. The price may change over time. The value corridor is an opportunity for the buyer/ seller to get an objective assessment of the value of this stone. With the receipt of new gemological research data, the cost corridor may be revised.
Gemologist Olga Melikian | WA: https://wa.me/79990437349 23/12/2025
Telegram: @olgamelikianofficial | https://melikianjewelry.com
Weight:..………………………………….………………..…… 1.70 ct
Stone Measurements: …………………….…… 7.18x6.19x4.09 mm
Сut: ……………………………………………..…………..….. Radiant
Color: ……………. Blue, Yellowish green | medium color saturation
Clarity: …………………………………………….………… loop clean
IDENTIFICATION: …… Natural SAPPHIRE (variety of corundum)
TRADE NAME: …………………….…. POLYCHROME SAPPHIRE
Geographic Origin: ……………..……………..………… Madagascar
Treatment: ………………………….. no indications of any treatment
Information about POLYCHROME SAPPHIRE from Madagascar:
In the south of Madagascar, near the city of Tranomaro, rare polychrome sapphires are found. There are usually yellow-green colors. If the stone contains three colors, it is rarer and more valuable.
10x glass: The stone is clean when examined with the naked eye and
a 10x magnifying glass. There are no cracks, chips, or naifs.
Refractive Index: ……………………….………….… 1.764-1.772, 0.008
Polariscope: ……………………………………………………anisotropic,
polychromy is clearly visible: from moderately blue to yellowish green
Dichroscope: ………………………………………………………………..
UV fluorescence: ………….……………………….…… no fluorescence
Chelsea Filter: ………………………………………..……..………..… no
Color change | Alexandrite effect (daylight | artificial light): …..….…no
Microscope: no indications of high temperature heating. The crystal growth zones are clearly visible, no cracks and chips.
Special properties:
Opalescence | adularescence | iridescence ………………………No
Cats eye effect…………………………………………….……….…No
Asterism……………………………………….………………………No
DETAILED GEMOLOGICAL COMMENT
To accurately determine the mining region, the gem report should be supplemented with Raman microscope study, obtaining the spectrum of this Polychrome sapphire, and comparing it with the base spectrum of polychrome sapphires from Madagascar.
Considering the characteristics of this Polychrome Sapphire:
Weight: ……..……………………………….…………….…….. 1.70 ct
Сut: ……………………………………………..……….….…. Radiant
Color: …………..… Blue, Yellowish green | medium color saturation
Clarity: ……………………………………………………..… loop clean
Geographic Origin: ………………………….…………… Madagascar
Treatment: ………………………..… no indications of any treatment
Recommended market value corridor (retail price) of Polychrome Sapphire from Madagascar, weighing more than 1.5 carat, Blue, Yellowish green | medium color saturation, as of 23.12.2025:
1500-1700 $ per 1 ct
Note: the recommended market value corridor in indicated on this date. The price may change over time. The value corridor is an opportunity for the buyer/ seller to get an objective assessment of the value of this stone. With the receipt of new gemological research data, the cost corridor may be revised.