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種類

Article (765)Exhibit (1)Reference (57)Report (3)Resource (1)

gemstonesSpecies

Amber (5)Andradite (1)Benitoite (1)Beryl (17)Chrysoberyl (6)Chrysocolla (1)Coral (1)Cordierite (4)Corundum (18)Diamond (29)Dravite (1)Fluorite (1)Hematite (1)Jadeite (7)Labradorite (7)Lazurite (4)Opal (6)Orthoclase (3)Pearl (16)Peridot (4)Phenakite (1)Pyrope (1)Quartz (23)Spinel (5)Spodumene (5)Topaz (5)Tourmaline (4)Turquoise (4)Zircon (4)Zoisite (4)

宝石

Alexandrite (7)Amber (9)Amethyst (17)Ametrine (4)Aquamarine (9)Citrine (6)Diamond (114)Diamond Fancy Color (14)Emerald (30)Garnet (8)Iolite (4)Jade (8)Kunzite (6)Lapis Lazuli (4)Moonstone (4)Morganite (6)Opal (15)Pearl (19)Peridot (7)Rose Quartz (4)Ruby (39)Sapphire (52)Spinel (14)Sunstone (8)Tanzanite (7)Topaz (13)Tourmaline (12)Turquoise (5)Zircon (6)

年

Abstract (5)Alumni Association (6)Alumni Spotlight (21)Analysis (1)Bibliography (1)Book Review (11)Chart (1)Diamonds From The Deep (1)Editorial (1)Feature (126)Field Report (28)Gem News International (21)Gems Gemology (9)Industry Analysis (30)Lab Notes (26)Micro World (2)Notes Techniques (4)Overview (6)Peer Reviewed (1)Profile (2)Research News (42)Reviews (7)The Story Behind The Story (4)

coverageCountry

Australia (4)Botswana (2)Brazil (1)China (1)India (2)South Africa (1)United States Of America (4)Vietnam (1)

トピック

Announcements (19)Chemical Composition (5)Clarity (2)Color (5)Cut (3)Design (6)Education (5)Enhancement (1)Fashion (1)Formation (1)Gemology (25)Geology (3)Grading (1)History (20)Identification (6)In Memoriam (1)Inclusions (5)Instrumentation (1)Jewelry (7)Localities (25)Material Properties (1)Mineralogy (3)Mining (8)Optical Effects (1)Optical Properties (1)Other Research Publications (2)Research (1)Synthetics (29)Techniques (1)Technology (2)Trade (18)Treatment Process (2)

coverageState

California (1)Montana (4)

coverageCity

Carlsbad (2)Gaborone (1)Jaipur (2)

secondarySubject

Assembled Stone (3)Carat Weight (11)Care (21)Chemical Composition (20)Clarity (17)Color (39)Crystal Structure (12)Cut (13)Design (44)Education (61)Enhancement (7)Faceting (11)Fashion (24)Folklore (10)Formation (19)Gemology (109)Geology (37)Grading (12)History (79)Identification (34)Imitations (7)Inclusions (20)Instrumentation (11)Jewelry (75)Localities (87)Manufacturing (26)Material Properties (13)Metals (11)Mineralogy (8)Mining (78)Ongoing Research (49)Optical Effects (8)Optical Properties (12)Organics (16)Other Research Publications (1)Physical Properties (27)Precious Metals (7)Pricing (11)Quality Factors (30)Recent Findings (10)Research (1)Simulants (2)Synthesis Process (14)Synthetics (21)Techniques (20)Technology (16)Tools (5)Trade (62)Travel (24)Treatment Process (24)

contentSubType

About GIA (5)Abstract (6)Advice (12)Alumni Association (28)Alumni Spotlight (14)Analysis (40)Bibliography (21)Biography (5)Book Review (14)Chart (1)Cover Story (1)Diamonds From The Deep (1)Editorial (18)Education Quarterly Article (1)Exhibit Current (7)Exhibit Past (1)Exhibit Upcoming (1)Feature (52)Field Report (9)Gem Facts (153)Gem News International (21)Gems Gemology (43)Industry Analysis (34)Lab Notes (33)Microworld (2)Museum Collection (5)News (30)Notes Techniques (3)Overview (13)Peer Reviewed (59)Profile (1)Research Field Gemology (14)Research G G (2)Research News (283)Research Publications (10)Research Scientific Equipment Techniques (4)Spotlight (3)The Story Behind The Story (1)

tertiarySubject

Carat Weight (1)Care (20)Chemical Composition (2)Color (4)Crystal Structure (6)Cut (3)Design (5)Education (7)Enhancement (3)Faceting (5)Fashion (3)Folklore (2)Formation (4)Gemology (27)Geology (3)History (15)Identification (9)Imitations (1)Inclusions (3)Instrumentation (2)Jewelry (8)Localities (9)Manufacturing (11)Material Properties (2)Metals (3)Mining (11)Optical Effects (3)Optical Properties (2)Other Research Publications (1)Physical Properties (7)Precious Metals (5)Pricing (4)Quality Factors (24)Simulants (2)Synthesis Process (5)Synthetics (7)Techniques (5)Technology (9)Tools (4)Trade (15)Travel (4)Treatment Process (4)

gemstonesGroup

Apatite (1)Feldspar (13)Garnet (15)Jade (14)Olivine (5)Tourmaline (19)

gemstonesVariety

Agalmatolite (3)Agate (3)Alexandrite (8)Amethyst (14)Ametrine (5)Ammolite (1)Aquamarine (7)Carnelian (3)Chalcedony (7)Chrome Diopside (1)Citrine (15)Demantoid (1)Emerald (15)Fire Agate (4)Heliodor (3)Hessonite (3)Indicolite (5)Jasper (4)Kunzite (7)Lapis Lazuli (10)Marble (1)Moonstone (9)Morganite (3)Nephrite (3)Onyx (3)Padparadscha (3)Peridot (7)Rock Crystal (2)Rose Quartz (6)Ruby (29)Sapphire (29)Smoky Quartz (3)Sunstone (8)Tanzanite (11)Tsavorite (1)

gemstonesQualifier

American (5)Ametrine (11)Cat S Eye (6)Chrome (3)Color Change (4)Crystal (6)Eqyptian (1)Fancy (3)Fire (1)Glass (4)Golden (4)Larimar (2)Matrix (4)Opalized (1)Parti Colored (5)Persian (3)Rose (4)Rutilated (6)Watermelon (1)

gemstoneElement

Aluminum (6)Beryllium (5)Boron (1)Calcium (8)Carbon (7)Chromium (6)Cobalt (1)Copper (8)Gold (9)Iron (9)Manganese (9)Oxygen (17)Platinum (3)Silicon (17)Sodium (4)Titanium (5)Vanadium (2)

gemstoneTreatment

Coating (9)Diffusion (2)Dyeing And Staining (8)Foil Backing (1)Fracture Filling (5)Heating (33)Impregnation (4)Irradiation (17)Oiling (1)Waxing (8)

gemstoneOpticalProperties

Absorption Spectrum (2)Adamantine (1)Adularescence Schiller (1)Alexandrite Effect (1)Allochromatic (5)Asterism (5)Aventurescence (2)Brilliance (4)Chatoyancy (13)Color Change (30)Dichroic (2)Diffraction (1)Dispersion (1)Doubly Refractive (18)Fire Dispersion (6)Fluorescence (1)Iridescence (2)Labradorescence (1)Luster (1)Metallic (4)Multicolored (8)Opaque (4)Particolored (10)Phenomenal (11)Play Of Color (3)Pleochroic (17)Refractive Index (21)Scintillation (4)Sheen (4)Translucent (8)Transparent (19)Vitreous (13)Waxy (1)

gemstoneStructure

Amorphous (1)Cleavage (13)Conchoidal (8)Crystal Habit (5)Crystal Structure (15)Crystalline (9)Durability (12)Fracture (8)Hardness (22)Inclusion (12)Optic Axis (4)Specific Gravity (16)Three Phase Inclusion (12)Toughness (12)

gemstoneCrystalGroup

Cubic (10)Hexagonal (19)Monoclinic (9)Orthorhombic (14)Tetragonal (3)Triclinic (8)Trigonal (9)

gemstoneColor

Black (17)Blue (66)Brown (29)Colorless (35)Gray (27)Green (60)Multicolored (22)Orange (40)Pink (43)Purple (43)Red (49)White (9)Yellow (41)

gemstoneFacet

Bezel (8)Crown (10)Culet (12)Finish (13)Girdle (10)Girdle Diameter (8)Lower Girdle (8)Make (9)Pavilion (11)Pavilion Mains (9)Polish (10)Proportions (12)Star (8)Symmetry (9)Table (14)Total Depth (9)

gemstoneFormation

Alluvial (7)Geode (4)Hydrothermal (4)Igneous (5)Inorganic (5)Metamorphic (8)Organic (3)Pegmatite (13)Placer (1)Primary Deposit (5)Rock (4)Rough (28)Secondary Deposit (2)Sedimentary (1)Surface Weathering (1)Volcanic (4)

gemstoneCut

Baguette (1)Bead (10)Brillant (20)Briolette (2)Buff Top (1)Cabochon (26)Cameo (1)Carving (19)Cushion (7)Cushion Cut (5)Cut Corner (9)Emerald (17)Faceted (21)Mixed (6)Modified (1)Octagon (5)Old European (1)Old Mine (1)Rough (12)Sphere (5)Step (13)Table (8)Tablet (8)Trilliant (4)Tumbled (10)

gemstoneShape

Fancy (26)Heart (16)Marquise (16)Oval (27)Pear (20)Rectangle (20)Round (38)Square (16)Triangle (18)

gemstonesFilters2

Alexandrite (6)Amber (4)Amethyst (10)Ametrine (3)Aquamarine (14)Citrine (2)Diamond (64)Diamond Fancy Color (41)Emerald (29)Garnet (19)Iolite (1)Jade (14)Lapis Lazuli (1)Moonstone (12)Morganite (6)Opal (19)Pearl (46)Peridot (10)Rose Quartz (3)Ruby (59)Sapphire (51)Spinel (16)Sunstone (6)Tanzanite (15)Topaz (17)Tourmaline (34)Turquoise (9)Zircon (6)

GIA擴充服務在杜拜開設先進鑑定所

February 2, 2026

GIA推出即日報告驗證服務

February 2, 2026

GIA 正在採取強有力的行動，以回應關於實驗室製造鑽石切割幾乎與 GIA 分級天然鑽石相匹配的欺詐性 GIA 銘文的報告。

GIA Facetware®

February 2, 2026

GIA Facetware® is a free online service that allows you to access over 38.5 million diamond proportion settings from the GIA database so you can estimate the cut grade of a diamond.