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La lista de esta página es estadounidense: la adoptó la National Association of Jewelers en Kansas City en 1912 y ha cambiado tres veces desde entonces, en 1952, 2002 y 2016. Es un estándar comercial, no una tradición. La tabla muestra la lista tal como se adoptó y tal como está hoy, y marca los meses en que difieren.

A hand-coloured plate of two rock fragments studded with dark blood-red dodecahedral garnet crystals, one bedded in grey-green schist and one in rusty brown matrix, with two loose crimson crystals and two outline diagrams of the twelve-sided form.GarneteneroA hand-coloured plate of two quartz specimens: above, a crust of small violet amethyst points on a pale cream nodule; below, a larger broken mass crowded with faintly purple, sharply pyramidal quartz crystals over its whole upper surface.AmethystfebreroA hand-coloured plate of a large broken beryl crystal, its vertical faces finely striated and shading from sea-green through milky white to buff, with a smaller weathered prism beside it and an outline diagram of the six-sided crystal below.AquamarinemarzoA hand-coloured plate of seven diamonds. Five are drawn as fine outline diagrams showing the facet patterns of brilliant, rose and table cuts; two are fully coloured deep blue-black brilliants, one seen face-on and one in profile.DiamondabrilA hand-coloured engraving of two emerald specimens: a slender deep-green hexagonal prism lying across a pale grey calcite matrix, and below it a large blocky green crystal seated in white rock speckled with small green grains.EmeraldmayoA single valve of the pearl oyster shown against a black ground inside an ornamental printed border: the shell is creamy white with concentric growth lines and a notched hinge, and one small round pearl sits attached to the nacre near its right edge.PearljunioA hand-coloured engraving of nineteen numbered corundum crystals in rows, most of them rose and crimson ruby, barrel-shaped or six-sided; also an orange-brown prism, a pale grey star-stone, and at lower right one large deep blue sapphire crystal.RubyjulioA chromolithograph headed Epidote, Garnet and Olivine. Low on the plate a pale yellow-green olivine crystal with a flat terminated top, and at the right the same stone cut as a vivid grass-green oval, among dark red garnets and green epidote.PeridotagostoA hand-coloured plate headed Colored Stones. At top left a deep blue cushion-cut sapphire; at top centre a large rough blue-grey sapphire showing a white six-rayed star; below them ruby, amethyst, yellow and orange stones, pale green cabochons and banded agate slices.SapphireseptiembreA hand-coloured engraving of a single opal nodule set alone on the page: an irregular water-worn lump whose broken face is milky blue-green and cream with faint yellow patches, edged along the underside by a rough dark brown weathered crust.OpaloctubreA chromolithograph of topaz: a pale blue crystal seated in buff matrix, a tall deep golden-orange striated prism, a lemon-yellow crystal on a druse of white crystals, a small rose-red prism, and cut stones in pale blue, amber, yellow and pink.TopaznoviembreA hand-coloured engraving of three turquoise specimens one above another: a pale blue-green crust broken into rounded patches within a dark green rind, a knobbly botryoidal mass, and a flat splintery slab of clear sky-blue turquoise seen edge-on.Turquoisediciembre
MesLista actualLa lista de 1912
eneroGarnetGarnet
febreroAmethystAmethyst
marzoAquamarine, Bloodstone (cambió desde 1912)Bloodstone, Aquamarine
abrilDiamondDiamond
mayoEmeraldEmerald
junioPearl, Moonstone, Alexandrite (cambió desde 1912)Pearl, Moonstone
julioRubyRuby
agostoPeridot, Spinel, Sardonyx (cambió desde 1912)Sardonyx, Peridot
septiembreSapphireSapphire
octubreOpal, TourmalineOpal, Tourmaline
noviembreTopaz, Citrine (cambió desde 1912)Topaz
diciembreTurquoise, Zircon, Tanzanite (cambió desde 1912)Turquoise, Lapis lazuli

5 de los doce meses han cambiado desde 1912, marcados arriba. La lista de 1912 es la que imprimió G. F. Kunz en The Curious Lore of Precious Stones (1913); la actual es la del GIA. Las páginas de detalle a las que llevan estos enlaces están en inglés.