Q gemstones

Quartz with gold
Natural gemstone. Hardness of 6
R gemstones

Rhyolite with blue quartz & pink feldspar
Natural gemstone. Hardness of 6

Ruby in fuchsite
Natural gemstone. Ruby has a hardness of 9, fuchsite only has a hardness of 2.5

Ruby in kyanite
Natural gemstone. Ruby has a hardness of 9, kyanite has a hardness of 5-7

Ruby in zoisite
Natural gemstone. Ruby has a hardness of 9, zoisite is brittle & only has a hardness of 6

Rutilated quartz with hematite
Natural gemstone. Hardness 7
S gemstones

Schalenblende
Natural gemstone. Hardness of 3.5-4

Scapolite
Natural gemstone. Hardness of 6

Septarian
Natural gemstone. Hardness of 3.5-4

Seraphinite
Natural gemstone. Hardness of 2-2.5

Sillimanite
Natural gemstone. Hardness 6-7

Spessartine garnet
Natural gemstone. Hardness 7.25

Sphene
Natural gemstone. Hardness 5-5.5

Spodumene
Natural gemstone. Hardness 7

Surfite
is a manmade gemstone cut from layers of hardened resin which have built up in the process of making surfboards
T gemstones

Thulite
Natural gemstone. Hardness of 6-6.5

Tiffany stone
Natural gemstone. Hardness of 4, equivalent to that of fluorite - a higher quartz or chalcedony content may increase hardness to 5

Tiger iron
Natural gemstone. Hardness between 5.5 and 6.5

Trapiche emerald
Natural gemstone. Hardness 7.5

Tsavorite garnet
Natural gemstone. Hardness 7-7.5
U, V & W gemstones

Variscite
Natural gemstone. Hardness 3.5-5

Welsh Blue
Manmade - a by-product of the iron smelting process in Wales.
X, Y & Z gemstones

None yet but this resource is continually being added to.