Star Ruby profile is under factual gemological review. Properties shown here are provisional unless marked as verified.

Star Sapphire profile is under factual gemological review. Properties shown here are provisional unless marked as verified.

Strawberry quartz is a quartz trade variety with red-pink coloration often linked to internal inclusions.

Sugilite is a rare purple cyclosilicate prized in collector and ornamental jewelry markets.

Sunrise jasper is a trade-name patterned jasper category emphasizing warm multitone color scenes.

Sunstone is a feldspar gemstone exhibiting aventurescent glitter from reflective inclusions.

Taaffeite is a rare beryllium-bearing oxide gemstone species distinct from spinel.

Tahitian pearl is a premium dark saltwater cultured pearl category.

Tanzanite is one of the few gemstones whose identity is closely tied to a single modern locality. Its blue-to-violet colour and pleochroic character give it an instantly contemporary profile among transparent jewellery stones.

Tektite is natural impact glass formed by meteorite impact events.

Thulite is a pink variety of zoisite used mainly in carvings and cabochons.

Tiger iron is a layered ornamental rock combining tiger eye, jasper, and hematite components.

Tiger's eye is a chatoyant quartz variety known for a bright moving eye effect.

Titanite (sphene) is a high-fire gemstone species valued by collectors and connoisseurs.

Topaz sits among the more resilient gem materials used for jewellery, which shapes both how it wears and how it is collected. Jewellers who need dependable wear resistance often come to it for different reasons, but identification still comes back to blue body colour, 8 Mohs hardness, and vitreous lustre. The secondary yellow note often matters more than people expect when separating it from lookalikes.

Tourmalinated quartz is quartz with visible black tourmaline inclusions creating striking contrast.

Locality plays an important role in how Tourmaline is understood in the gem trade. That combination of green body colour, 7 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice. The secondary pink note often matters more than people expect when separating it from lookalikes.

Tsavorite is the vivid green variety of grossular garnet colored by vanadium/chromium.

Tugtupite is a rare pink feldspathoid known for UV fluorescence and light-sensitive color behavior.

Turquoise has been used for ornament and status objects for millennia, yet its appeal remains straightforward: an unmistakable blue-to-green body colour, often paired with matrix patterns that make each piece visually individual.

Uvarovite is the chromium-rich green garnet species known for vivid drusy crystal clusters.

Variscite is a hydrated aluminum phosphate used in cabochons and carvings for green color.

Vesuvianite, also known as idocrase, is a calcium-rich silicate gemstone species.

Watermelon tourmaline is a zoned tourmaline variety typically showing pink core and green rim coloration.