|Country of origin|
|China and Japan|
The characteristic feature of the pearlscale is its thick, domed scales with pearl-like appearance. Its body is round and similar to a golf ball. The finnage may be long or short. Pearlscales can reach up to 8 inches long and grow up as large as an oranges. However, pearlscale goldfish are prone to swimbladder disorders which affect the ability to maintain normal position in the water. This is attributed to the selective breeding process of fancy goldfish to achieve particular body forms, such as that of the pearlscale's roundness. Selective breeding gradually resulted to the alteration of the appearance of the swimbladder. It is also known as the Ping Pong Pearlscale, and Golfball Pearlscale.
The pearlscale standard is as follows:
- Depth of body to be greater than 2/3 of body length
- Scales to be domed
- Dorsal fin to be single, all other fins to be paired.
- Caudal fin to be divided and forked and held above the horizontal.
- Extremities of fins to have a slightly rounded appearance.
- Minimum length of body to be 5.5 cm (2¼ inches).
The fish should be bright and alert and displaying well developed domed scales all over the body area. The body should be short and rounded (not elongated). The caudal fin should be held high without signs of drooping and well divided. Quality fish will have high colour intensity extending into the fins.
Pearlscales come in every colour variety.
The colour may be metallic (self-coloured or variegated in a pleasing pattern and similar on each side), orange or calico. Also may be in full black colour. Metallic colours should appear as burnished metal, extending into the fins. Calico fish should have a blue background with patches of violet, red, orange, yellow and brown, spotted with black.
Pearlscales are found without headgrowth, with Oranda-like headgrowth or with two large bubble domes. The bubble-domed Pearlscales are known as high-head pearlscale, crown pearlscale or Hama nishiki.
Pearlscales are egg shaped with internal organs crowding the creature's compact body, therefore overfeeding should be avoided. Pearlscales are very sensitive to cold water and should not be exposed to temperature readings below 55°F (13°C) and are also quite vulnerable to pH changes and should not be exposed for long periods to a high acidity or alkalinity environment. 
- An Interpet Guide to Fancy Goldfish" by Dr. Chris Andrews, Interpet Publishing, 2002. - ISBN 1-902389-64-6
- "Fishes in Nature and in the Aquarium" from Nutrafin News Aquatic magazine, Rolf C. Hagen (U.S.A.) Inc. and Rolf C. Hagen Corp. (Montreal, Canada), Issue #4, 2004
- "Fancy Goldfish: A Complete Guide to Care and Collecting" by Dr. Erik L. Johnson, D.V.M. and Richard E. Hess, Weatherhill, Shambala Publications, Inc., 2006. - ISBN 0-8348-0448-4
- Article on Pearlscale Goldfish from bristol-aquarists.com