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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 養殖珍珠報告包含可追溯性訊息

February 2, 2026

理事會成員約翰‧威利（John W. Valley）博士榮休

February 2, 2026

加州卡爾斯巴德 ─ 2023年11月20日 ─ 自2014年起擔任GIA理事會成員的約翰‧W‧威利（John W. Valley）博士，11月初在加州卡爾斯巴德舉行的年度例會後正式退任。理事會及GIA管理層感激他在任期間作出重大貢獻，特別以其名字命名一項GIA獎學金，以表敬意。

新礦物以 GIA 理事 Barbara Dutrow 博士名字命名以示敬意

February 2, 2026

兼讀課程

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認證和認可

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入學要求

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應用珠寶家課程

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企業培訓

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Designed for Working Professionals

教學理念

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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.