It depends on what form its in. Most forms of carbon are opaque. Diamond, however, is transparent.
A gem-stone quality diamond is valued by its cut, clarity, carat weight and colour. Diamond is one allotrope carbon of where the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic. Diamond is an optically isotropic crystal that is transparent to opaque. Seventy-five percent or more of all diamonds mined are used by industry, because of the hardness of diamond.
Yttrium is opaque.
Carbon paper is opaque
Opaque Material That Light Passes Less
Then, your diamond looks opaque white under a black light.
It depends on what form its in. Most forms of carbon are opaque. Diamond, however, is transparent.
Some diamonds can be considered opaque, because they are seriously flawed. These are then sent to industry as industrial diamonds: the use for 75% of all diamonds mined. A diamond gemstone is clear with small inclusions, not opaque.
Raw diamonds can be transparent, translucent or opaque, depending on their clarity. Gem-quality diamonds are transparent.
'Good' is a judgement call, and you are the judge.
Carbonado, a form of opaque or dark-colored diamond used for drills.
Metallic crystals absorb light in the visible spectra, diamond crystal do not.
Gem-quality diamonds can be said to be transparent to translucent in rough crystals. Industrial diamonds are cloudy -- intensely flawed -- and may be opaque, but are not considered transparent.
Covalent crystals are not necessarily opaque. Think of diamond, pure quartz crystals, pure aluminium oxide crystals these all are colorless and transparent.
Not all crystalline materials are opaque, for instance diamond and many others. Some crystalline materials are opaque, it's because they absorb white light, which causes a gap (from IR up to UV) in the transmission spectra.
Diamond is the allotrope carbon of where the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic. Diamond is an optically isotropic crystal that is transparent to opaque to cloudy, depending on the quality of the diamond.
A clear (relative) crystal of Diamond what ever be the color,even black now-a-days that can be used in Jewellery or as a collectable maybe called a Gem diamond. Industrial diamond are usually opaque and dumb to look at!!