Its the luster of a diamond.
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The luster of the sapphire is vitreous or adamantine.
Ruby
Diamonds do not have a metallic luster; diamond luster is adamantine to waxy.
transparent, adamantine to waxy.
Ruby
The luster of the sapphire is vitreous or adamantine.
Diamond luster is described as adamantine to waxy. Adamantine luster is described as "...non-metallic, brilliant-light-reflecting and transmitting properties of minerals..." and is not limited to diamonds.
Ruby
Diamonds do not have a metallic luster; diamond luster is adamantine to waxy.
the luster of a diamond is adamantine to waxy.
transparent, adamantine to waxy.
Ruby
transparent, adamantine to waxy.
Glassy luster, Metallic luster and Waxy luster.
"Luster" is a term used to characterize a mineral(Reflection of a light). Sulfur Lustre or luster is Adamantine on on crystal faces,glimmering on fracture surfaces!
Depending on the variety, feldspars can range from adamantine to glassy in luster.
Adamantine is a mineral, often referred to as adamantine spar. It is a silky brown form of corundum. It has a Mohs rating of 9. Adamantine is also used as an adjective to refer to non-metallic, brilliant light reflecting and transmitting properties, known as adamantine luster. Diamond is the best known material to be described as having adamantine luster, although anglesite, cerussite and corundum in some of its forms are also described in this way.Adamantine can also refer to any fictitious or mythological material that is extremely hard (often at least as hard as diamond) or has some other special properties.