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The never-ending quest for jewellery brilliance

The jewels shine brightly and dazzlingly.

Its unchanging beauty has continued to bring joy and excitement to people's hearts since time immemorial.


Why do gemstones sparkle so beautifully?

What is the reason for its continued sparkle?

What makes gemstones sparkle?

A gemstone will not shine beautifully just by being polished randomly.
Each mineral has a different color and properties, so even if they are polished in the same way, they will not necessarily shine in the same way. Even if the mineral type and color are the same, the way it shines will vary depending on how it is cut and the skill of the polisher.
The brilliance of a gemstone comes from the reflection of light.
The more beautiful the polished surface and the sharper the corners, the sharper the shine will be, and the angle, size, and balance between surfaces also affect the shine.
While some aspects vary depending on the properties of the stone, such as its Mohs hardness and durability, differences in polishing technique also affect the finish, and the higher the skill level, the more beautiful the brilliance that can be achieved.

How to Polish Gemstones

Have you ever seen a gemstone being polished?
Although industrial machinery has become more advanced, hand polishing is still the most common method used around the world when it comes to gemstone polishing.
Although it is done by hand, in many cases an auxiliary tool called a faceter is used.
Even with the same cut, a stone polished by a highly skilled craftsman will bring out the gemstone's maximum charm and give it a unique sparkle.
*A traditional method in Yamanashi Prefecture is to polish the stone by holding it in your hand.

Commitment to gemstone polishing

Caratz seeks out cutters with excellent technical and development skills in gemstone collection and production centers around the world, and by forming partnerships with these factories, strives to procure a large amount of beautifully cut gemstones.
We often have the rough stones mined locally polished, which reduces the middleman's margin and leads to cost savings.
We also collaborate with craftsmen to develop original cuts.
We hope to continue working with polishers around the world to provide even more gemstones that shine beautifully and are full of originality.

*"Vortex Cut" is a registered trademark of KARATZ Co., Ltd.

To learn more about KARATZ

  • KARATZ: Five Specialties
  • Jewelry buying trips around the world
  • The journey from purchase to listing
  • Our passion for original jewelry
  • The secret behind our low prices
  • Caratz's Initiatives and Social Contributions
  • Karatz's thoughts