Update: March 1, 2023

Koo-fu

Koo-fu is the brand that represents jewelry produced in Yamanashi Prefecture; its name is derived from Kofu, the prefectural capital. Its theme is natural, subtle elegance. In design, technology, and superior raw materials, Koo-fu is on the cutting edge of new jewelry trends, while at the same time making used of the traditional jewelry-making skills for which Yamanashi has long been renowned. Koo-fu jewelry is made using the following advanced materials and techniques:

Koo-fu

 

Koo-fu Pt950	Use of 95% pure platinum (Pt950) ensures a hard, scratch-resistant surface and white, brilliant shine without plating.
Koo-fu K18WG	White gold. A bright, gleaming white gold produced without use of nickel or plating.
Koo-fu K18YG	Koo-fuK18PG: Koo-fu original gold alloys. These bright, vivid yellow-gold and pink-gold alloys are resistant to deformation and discoloration.
Koo-fu Ag950	A higher purity, more discoloration-resistant silver material.
Intaglio	A general term for sunk relief carving, intaglio is a sculptural technique used in creating jewelry from precious metals and gemstones.