Gemstone Glossary: Rough, Faceted & Mineral Terms
This gemstone glossary explains common gemstone, rough stone, and lapidary terms in clear, simple language. It is designed for beginners, jewelry makers, lapidary artists, collectors, and wholesale buyers who want to understand gemstones before buying.
Use this guide to learn gemstone terminology, avoid confusion, and make confident purchasing decisions.
A
Authentic Gemstone
A gemstone that is real and not fake. It may be natural or treated, but it is not synthetic or imitation.
AAA Quality – A commercial grading term indicating high color, clarity, and overall quality.
Authentic Gemstone – A real gemstone that is not fake or imitation.
Aquamarine – A blue to blue-green variety of beryl used in jewelry and faceting. More about Aquamarine..
B
Birthstone
A gemstone traditionally associated with a specific month of the year. See List of Birthstones here...
Bulk Gemstones
Gemstones sold in larger quantities, often at discounted or wholesale pricing. What are Bulk Gemstones, Learn here..
Blue Sapphire – A blue variety of corundum, prized for durability and color. Know about Sapphire..
Beryl – A mineral family that includes emerald and aquamarine.
C
Carat – A unit of gemstone weight equal to 0.2 grams.
Carat Weight
The standard unit used to measure the weight of gemstones. One carat equals 0.2 grams.
Clarity
The degree to which a gemstone is free from internal inclusions or surface imperfections.
Crystal Specimen
A natural mineral crystal kept in its original, uncut form and valued by collectors.
Cabochon – A gemstone cut with a smooth, rounded surface instead of facets.
Color Zoning – Uneven color distribution within a gemstone.
Crystal Habit – The natural growth shape of a crystal. What are Crystals and How they are formed?, Learn about Crystals here...
D
Durability
A gemstone’s ability to resist scratching, breaking, or damage during wear or cutting.
Dispersion – The ability of a gemstone to separate light into spectral colors.
Doublet – A gemstone made of two bonded layers.
E
Emerald
A green variety of beryl, valued for its rich color and rarity. Often found as rough or faceted stones. Learn about Emerald Gemstones....
Eye-Clean
A gemstone that shows no visible inclusions when viewed with the naked eye.
Enhancement – Any treatment applied to improve a gemstone’s appearance. Learn about treatments here ...
F
Facet – A flat polished surface on a gemstone.
Facet Grade Rough
Rough gemstones that have enough clarity, color, and structure to be cut into faceted gemstones for jewelry. What are Facet Grade Rough Stones?
Faceted Gemstone
A gemstone that has been cut and polished with flat surfaces (facets) to enhance brilliance. Want to know about Facet Stones?, see here...
Fluorescence – A gemstone’s reaction to ultraviolet light.
G
Garnet
A group of minerals available in many colors, commonly used in both rough and faceted forms.
Gemstone
A mineral or organic material valued for beauty, durability, and rarity.
Gem Rough – Another term for rough gemstones.
H
Heat Treatment
A common gemstone treatment used to enhance color or clarity. Heat treatment must always be disclosed.
Hardness – Resistance to scratching, measured by Mohs scale.
I
Imitation Gemstone
A material that looks like a gemstone but is made from glass, plastic, or other non-gem materials.
Inclusion
Natural internal features within a gemstone, such as crystals, fractures, or growth patterns.
J
Jewelry-Grade Gemstone
A gemstone suitable for use in jewelry due to adequate durability and appearance.
L
Lab-Created Gemstone
A gemstone grown in a laboratory with the same chemical composition as natural stones but not formed in the earth.
Lapidary
The art of cutting, shaping, and polishing gemstones.
Lapidary Rough
Natural rough gemstones suitable for cutting, carving, or polishing by lapidary artists.
Loose Gemstone
A gemstone that is not set in jewelry and can be used for custom designs.
M
Mineral Specimen
A naturally occurring mineral collected for study or display rather than for jewelry.
Matrix – The host rock in which a gemstone forms.
Mineral – A naturally occurring inorganic substance.
Mohs Scale – A scale measuring mineral hardness.
N
Natural Gemstone
A gemstone formed naturally in the earth without laboratory creation.
O
Origin
The geographic location where a gemstone was mined. Origin can affect value.
Opaque – A gemstone that does not transmit light.
P
Peridot
A green gemstone variety of olivine, commonly sold as rough or faceted stones.
Polished Gemstone
A gemstone that has been smoothed but not faceted.
Parcel – A group of gemstones sold together.
Precious Gemstone – Traditionally emerald, ruby, sapphire, diamond.
Q
Quartz – A common mineral group including amethyst and citrine.
R
Rare Gemstone
A gemstone that is uncommon due to limited supply, location, or unique characteristics.
Rough Gemstone
A gemstone in its natural, uncut state as it comes from the mine.
Refractive Index – How light bends inside a gemstone.
Rough Crystal – A gemstone crystal in natural form.
S
Sapphire
A variety of corundum available in many colors, commonly blue.
Synthetic Gemstone
A man-made stone designed to imitate natural gemstones. Not naturally mined.
Semi‑Precious Gemstone – A traditional trade term for non‑precious stones.
T
Topaz
A gemstone known for clarity and availability in multiple colors.
Treated Gemstone
A natural gemstone that has been enhanced to improve appearance or durability. Treatments must be disclosed.
Table – The flat top facet of a gemstone.
Transparency – The degree light passes through a gemstone.
U
Untreated Gemstone
A gemstone that has not undergone any enhancement or treatment.
W
Wholesale Gemstones
Gemstones sold in bulk quantities, usually at lower per-unit prices for dealers and jewelers.
X
X‑Ray Testing – A method used to identify gemstone structure.
Y
Yield – The usable gemstone obtained from rough after cutting.
Z
Zoning – Uneven color patterns within a gemstone.
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