Indeed, I did notice that this site has far more stamp listings than diamond & gemstone sellers. On the bay the numbers are more like 3 stamp listings for every 2 loose gemstones (not including unfinished gems or beads), and the lopsided ratio may be more a result of people currently selling here rather than potential. If the Loose Diamonds & Gemstones subcategories included the gems recognized by gemological authorities, the category tree would look something like the following (per CIBJO, Schumann and others). This would collapse into 50 or fewer main categories capable of accommodating all the major gemstone species and varieties, keeping far fewer important varieties from getting thrown into the catchall "Other" category or misplaced into categories where they do not belong:
Loose Diamonds & Gemstones/Alabaster - spar
Loose Diamonds & Gemstones/Amber and Copal
Loose Diamonds & Gemstones/Andalusite
Loose Diamonds & Gemstones/Apatite
Loose Diamonds & Gemstones/Beryls
Loose Diamonds & Gemstones/Beryls/Aquamarine
Loose Diamonds & Gemstones/Beryls/Emerald
Loose Diamonds & Gemstones/Beryls/Goshenite
Loose Diamonds & Gemstones/Beryls/Heliodor
Loose Diamonds & Gemstones/Beryls/Morganite
Loose Diamonds & Gemstones/Beryls/Yellow
Loose Diamonds & Gemstones/Beryls/other
Loose Diamonds & Gemstones/Charoite
Loose Diamonds & Gemstones/Chrysoberyls
Loose Diamonds & Gemstones/Chrysoberyls/Alexandrite
Loose Diamonds & Gemstones/Chrysoberyls/Chrysoberyl
Loose Diamonds & Gemstones/Chrysoberyls/Cymophane
Loose Diamonds & Gemstones/Chrysocolla
Loose Diamonds & Gemstones/Coral
Loose Diamonds & Gemstones/Corundum
Loose Diamonds & Gemstones/Corundum/Ruby
Loose Diamonds & Gemstones/Corundum/Sapphire
Loose Diamonds & Gemstones/Corundum/other
Loose Diamonds & Gemstones/Danburite
Loose Diamonds & Gemstones/Diamond
Loose Diamonds & Gemstones/Diaspore
Loose Diamonds & Gemstones/Diopside
Loose Diamonds & Gemstones/Epidote
Loose Diamonds & Gemstones/Feldspars
Loose Diamonds & Gemstones/Feldspars/Amazonite
Loose Diamonds & Gemstones/Feldspars/Aventurine Feldspar (Sunstone)
Loose Diamonds & Gemstones/Feldspars/Labradorite
Loose Diamonds & Gemstones/Feldspars/Moonstone
Loose Diamonds & Gemstones/Feldspars/Orthoclase
Loose Diamonds & Gemstones/Feldspars/other
Loose Diamonds & Gemstones/Fluorite
Loose Diamonds & Gemstones/Fossils
Loose Diamonds & Gemstones/Fossils/Invertebrates
Loose Diamonds & Gemstones/Fossils/Odontolite
Loose Diamonds & Gemstones/Fossils/Plant
Loose Diamonds & Gemstones/Fossils/Vertebrates
Loose Diamonds & Gemstones/Garnets
Loose Diamonds & Gemstones/Garnets/Almandine
Loose Diamonds & Gemstones/Garnets/Andradite
Loose Diamonds & Gemstones/Garnets/Grossular
Loose Diamonds & Gemstones/Garnets/Malaia (umbalite)
Loose Diamonds & Gemstones/Garnets/Pyrope
Loose Diamonds & Gemstones/Garnets/Rhodolite
Loose Diamonds & Gemstones/Garnets/Spessartine
Loose Diamonds & Gemstones/Garnets/other
Loose Diamonds & Gemstones/Idocrase/vesuvianite
Loose Diamonds & Gemstones/Iolite (cordierite)
Loose Diamonds & Gemstones/Ivory
Loose Diamonds & Gemstones/Jades
Loose Diamonds & Gemstones/Jades/jadeite
Loose Diamonds & Gemstones/Jades/nephrite
Loose Diamonds & Gemstones/Kyanite
Loose Diamonds & Gemstones/Lapis Lazuli
Loose Diamonds & Gemstones/Malachite
Loose Diamonds & Gemstones/Marble-Ophicalcite
Loose Diamonds & Gemstones/Mother of Pearl
Loose Diamonds & Gemstones/Onyx Marble/Travertine
Loose Diamonds & Gemstones/Obsidian
Loose Diamonds & Gemstones/Opals
Loose Diamonds & Gemstones/Pearl
Loose Diamonds & Gemstones/Peridot-olivine
Loose Diamonds & Gemstones/Quartz/Quartzes
Loose Diamonds & Gemstones/Quartz/Quartzes/Amethyst
Loose Diamonds & Gemstones/Quartz/Quartzes/Ametrine
Loose Diamonds & Gemstones/Quartz/Quartzes/Aventurine
Loose Diamonds & Gemstones/Quartz/Quartzes/Blue Quartz
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Agate
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Agate/Banded
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Agate/Botryoidal
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Agate/Dendritic
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Agate/Fire
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Agate/ris
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Agate/Moss & Plume
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Carnelian (cornelian)
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Chrysoprase
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Mtorolite
Loose Diamonds & Gemstones/Quartz/Quartzes/Onyx (layered)
Loose Diamonds & Gemstones/Quartz/Quartzes/Prase
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/Sard
Loose Diamonds & Gemstones/Quartz/Quartzes/Chalcedony/other
Loose Diamonds & Gemstones/Quartz/Quartzes/Citrine
Loose Diamonds & Gemstones/Quartz/Quartzes/Hawk's Eye
Loose Diamonds & Gemstones/Quartz/Quartzes/Iris Quartz
Loose Diamonds & Gemstones/Quartz/Quartzes/Jasper
Loose Diamonds & Gemstones/Quartz/Quartzes/Jasper/Bloodstone (heliotrope)
Loose Diamonds & Gemstones/Quartz/Quartzes/Jasper/multi-colored
Loose Diamonds & Gemstones/Quartz/Quartzes/Jasper/Orbicular
Loose Diamonds & Gemstones/Quartz/Quartzes/Jasper/single color
Loose Diamonds & Gemstones/Quartz/Quartzes/Prase
Loose Diamonds & Gemstones/Quartz/Quartzes/Prasiolite
Loose Diamonds & Gemstones/Quartz/Quartzes/Quartz Cat's Eye
Loose Diamonds & Gemstones/Quartz/Quartzes/Quartz with Inclusions
Loose Diamonds & Gemstones/Quartz/Quartzes/Quartzite
Loose Diamonds & Gemstones/Quartz/Quartzes/Rock Crystal
Loose Diamonds & Gemstones/Quartz/Quartzes/Rose Quartz
Loose Diamonds & Gemstones/Quartz/Quartzes/Sard
Loose Diamonds & Gemstones/Quartz/Quartzes/Smoky Quartz
Loose Diamonds & Gemstones/Quartz/Quartzes/Tiger's Eye
Loose Diamonds & Gemstones/Rhodochrosite
Loose Diamonds & Gemstones/Rhodonite
Loose Diamonds & Gemstones/Shell & Operculum
Loose Diamonds & Gemstones/Serpentine
Loose Diamonds & Gemstones//Sodalite
Loose Diamonds & Gemstones/Sphene (titanite)
Loose Diamonds & Gemstones/Spinel
Loose Diamonds & Gemstones/Spodumene
Loose Diamonds & Gemstones/Spodumene/Hiddenite
Loose Diamonds & Gemstones/Spodumene/Kunzite
Loose Diamonds & Gemstones/Spodumene/Triphane
Loose Diamonds & Gemstones/Spodumene/other
Loose Diamonds & Gemstones/Sugilite
Loose Diamonds & Gemstones/Tektites
Loose Diamonds & Gemstones/Tektites/Modavite
Loose Diamonds & Gemstones/Tektites/other tektite
Loose Diamonds & Gemstones/Topaz
Loose Diamonds & Gemstones/Tourmalines
Loose Diamonds & Gemstones/Turquoises
Loose Diamonds & Gemstones/Turquoises/Turquoise
Loose Diamonds & Gemstones/Turquoises/Variscite
Loose Diamonds & Gemstones/Turquoises/other
Loose Diamonds & Gemstones/Zircon
Loose Diamonds & Gemstones/Zoisite - Tanzanite
Loose Diamonds & Gemstones/other/
Loose Diamonds & Gemstones/other/Amblygonite-Montebrasite
Loose Diamonds & Gemstones/other/Axinite
Loose Diamonds & Gemstones/other/Azurite
Loose Diamonds & Gemstones/other/Benitoite
Loose Diamonds & Gemstones/other/Beryllonite
Loose Diamonds & Gemstones/other/Brazilianite
Loose Diamonds & Gemstones/other/Cassiterite
Loose Diamonds & Gemstones/other/Cerussite
Loose Diamonds & Gemstones/other/Coal and Jet
Loose Diamonds & Gemstones/other/Datolite
Loose Diamonds & Gemstones/other/Dioptase
Loose Diamonds & Gemstones/other/Dumortierite
Loose Diamonds & Gemstones/other/Enstatite-hypersthene
Loose Diamonds & Gemstones/other/Euclase
Loose Diamonds & Gemstones/other/Hambergite
Loose Diamonds & Gemstones/other/Hematite
Loose Diamonds & Gemstones/other/Hemimorphite
Loose Diamonds & Gemstones/other/Kornerupine
Loose Diamonds & Gemstones/other/Lazulite
Loose Diamonds & Gemstones/other/Maw-sit-sit
Loose Diamonds & Gemstones/other/Orbicular Diorite
Loose Diamonds & Gemstones/other/Petalite
Loose Diamonds & Gemstones/other/Pezzottaite
Loose Diamonds & Gemstones/other/Phenakite
Loose Diamonds & Gemstones/other/Prehnite
Loose Diamonds & Gemstones/other/Purpurite
Loose Diamonds & Gemstones/other/Pyrite
Loose Diamonds & Gemstones/other/Pyrophyllite
Loose Diamonds & Gemstones/other/Scapolite
Loose Diamonds & Gemstones/other/Scheelite
Loose Diamonds & Gemstones/other/Sillimanite
Loose Diamonds & Gemstones/other/Sinhalite
Loose Diamonds & Gemstones/other/Smithsonite
Loose Diamonds & Gemstones/other/Sphalerite
Loose Diamonds & Gemstones/other/Stichtite
Loose Diamonds & Gemstones/other/Taaffeite
Loose Diamonds & Gemstones/other/Talcs
Loose Diamonds & Gemstones/other/Talcs/Agalmatolite
Loose Diamonds & Gemstones/other/Talcs/Soapstone
Loose Diamonds & Gemstones/other/Talcs/Steatite
Loose Diamonds & Gemstones/other/Tugtupite
Loose Diamonds & Gemstones/other/Ulexite
Loose Diamonds & Gemstones/other/Verdite
Loose Diamonds & Gemstones/other/uncategorized others
The jewelry industry is constantly coming up with, and changing, unofficial marketing names. The basic gem species and varieties, however, stay the same. Perhaps once per decade will limited quantities of any truly new "other" variety be discovered and/or catch on briefly before disappearing.