The point of appreciating this group is of course the intensity of the Hikari, or luster. Their markings are similar to those of Showa Sanshoku and Utsurimono group mentioned before.
Hikari Utsuri are Koi of Showa and Utsurimono groups (Showa Sanshoku, Shiro Utsuri, and Hi Utsuri, etc.) displaying "Hikari (luster or glitter)," and include "Kin Showa (with lustrous gold color)," "Gin Shiro Utsuri (with platinum sheen)," and "Kin Ki Utsuri (literally golden yellow Utsuri')."
A strong metallic luster has a tendency to make the pigment fade, so as, Hi can have a brownish tint and Sumi may appear as gray. There is an intricate aspect which we must pay close attention; Both Hikari and Sumi pigment have a tendency to cancel each other -- most Koi with strong Hikari have light Sumi. Consequently, Koi having brilliant Hikari and strong Sumi simultaneously are very rare.