Seylan Gems & Jewelry
A listing is a description of one item we are offering. It is not a laboratory certificate, even when it repeats words a laboratory might also use. Read it in this order: identity, size, treatment, then the pictures.
Specifications
Typical published ranges used in gemology. Specific gravity below matches our carat calculator default where applicable. (SG 4.00)
| Identity | The species or variety in the title, such as sapphire, spinel, or garnet |
|---|---|
| Weight | Carat weight of that stone, not a size in millimetres |
| Measurements | Length × width × depth in millimetres when we have them |
| Treatment | Heated, unheated, or another stated treatment — only as written on that item |
| Origin | Named only when we are stating it for that stone |
| Pictures | Photos and any 360 view show the stone; they are not a test report |
Carat is weight. Millimetres are size. A deep stone can weigh more and look smaller face-up than a shallow stone of the same weight. If you are matching a setting, the millimetres decide whether it fits. If you are comparing price, ask for price per carat only after you know you are comparing the same species and a similar quality.
Titles sometimes abbreviate carat as “ct”. On the page, read the weight field as well as the title. If they disagree, ask us before you buy. Do not average them.
“Unheated” means we are saying that stone was not heat-treated, not that every stone of the species is unheated. “Ceylon” or “Sri Lanka” is an origin statement for that item. Clarity words such as “eye clean” mean inclusions are not obvious to the unaided eye at a normal distance. They are not a laboratory grade.
Flawless, as a trade idea, means no inclusions or blemishes visible under 10× magnification. We do not want that word used as decoration. If you see it, it should survive a loupe. When you are unsure, ask and we will tell you what we can actually support.
Use the photos to judge color, the outline, and obvious inclusions. Use a 360 view, when the item has one, to see the profile and the depth. Screens shift color. Daylight near a window is a better check than a phone in a dark room.
A picture of a refractometer, a tester, or an inclusion is evidence we chose to show. It is still not a certificate with a report number. If you need a laboratory document for insurance, say so before you purchase and we will tell you what exists for that stone.
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Sapphire
Ruby
Alexandrite
Emerald
Padparadscha
Aquamarine
Spinel
Garnet
Peridot
Tourmaline
Tanzanite
Citrine
Quartz
Chrysoberyl
Apatite
Topaz
Amethyst
Lolite
Zircon
Sinhalite
Cats Eye
Opal