Alexandrite is the colour-change variety of chrysoberyl, typically shifting from green to bluish green in daylight to red to purplish red under incandescent light. Commercial alexandrite is sourced mainly from Brazil, Sri Lanka, and East Africa, with the Russian Urals important historically.

Black Spinel sits among the more resilient gem materials used for jewellery, which shapes both how it wears and how it is collected. That combination of black body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice.

Blue Spinel sits among the more resilient gem materials used for jewellery, which shapes both how it wears and how it is collected. That combination of blue body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice.

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

Cat's-eye chrysoberyl is chrysoberyl displaying a strong chatoyant eye caused by aligned inclusions.

Cat's Eye Topaz earns attention when light begins to travel across or through it. Collectors who care about optical performance often come to it for different reasons, but identification still comes back to blue body colour, chatoyancy optical effects, and 8 Mohs hardness. The effect is best judged in motion, since a static view rarely shows the full character of the stone.

Among jewellery stones, Champagne Topaz stands out for combining appearance with notable wear resistance. 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 champagne note often matters more than people expect when separating it from lookalikes.

Chrysoberyl is a very hard beryllium aluminum oxide gemstone species that includes alexandrite and cat-eye varieties.

Cymophane is the traditional mineralogical name for cat's-eye chrysoberyl.

No gemstone has a stronger reputation for durability than diamond, and that reputation is grounded in crystal structure rather than marketing. Its exceptional hardness, high lustre, and ability to return crisp light make it central to both jewellery and industrial applications.

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

Durability is part of the appeal of Green Topaz, not merely a technical footnote. Jewellers who need dependable wear resistance often come to it for different reasons, but identification still comes back to green body colour, 8 Mohs hardness, and vitreous lustre.

Durability is part of the appeal of Imperial Topaz, not merely a technical footnote. 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.

Durability is part of the appeal of London Blue Topaz, not merely a technical footnote. 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.

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

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

Among jewellery stones, Orange Spinel stands out for combining appearance with notable wear resistance. That combination of orange body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice.

Padparadscha Sapphire sits among the more resilient gem materials used for jewellery, which shapes both how it wears and how it is collected. That combination of blue body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice. The secondary sapphire blue note often matters more than people expect when separating it from lookalikes.

Paraiba spinel is a trade term for bright neon blue-green spinel resembling paraiba-style color appearance.

Among jewellery stones, Peach Topaz stands out for combining appearance with notable wear resistance. That combination of blue body colour, 8 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice. The secondary orange note often matters more than people expect when separating it from lookalikes.

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

Pink Spinel sits among the more resilient gem materials used for jewellery, which shapes both how it wears and how it is collected. That combination of pink body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice.

Red Spinel sits among the more resilient gem materials used for jewellery, which shapes both how it wears and how it is collected. That combination of red body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice.

Durability is part of the appeal of Royal Blue Sapphire, not merely a technical footnote. That combination of blue body colour, 9 Mohs hardness, and vitreous lustre is what usually makes it recognisable in practice. The secondary royal blue note often matters more than people expect when separating it from lookalikes.

Ruby is defined by red corundum, but not every red stone carries the same authority of colour. The most sought-after examples combine vivid saturation with enough transparency to let the red remain bright rather than murky.

Sapphire covers far more than blue, yet the gem remains associated with crisp colour, durability, and a polished, highly wearable finish. Its place in jewellery owes as much to resilience as to appearance.

Among jewellery stones, Sky Blue Topaz stands out for combining appearance with notable wear resistance. 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 sky blue note often matters more than people expect when separating it from lookalikes.

Durability is part of the appeal of Spinel, not merely a technical footnote. That combination of blue body colour, 9 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.

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.

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

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.

White sapphire is the colorless variety of corundum valued for durability and brilliance.

White spinel is the colorless to near-colorless variety of spinel used in fine jewelry.

Yellow sapphire is the yellow color variety of corundum valued for durability and bright color.

Yellow topaz is a durable topaz color variety used in faceted jewelry gems.