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boulder opal

Boulder opal is an opal with sandstone or iron ore as its host rock, and it exhibits a play of color effect. The main production area is Queensland, Australia. Because it is often cut into unique shapes, it is a gemstone that can be enjoyed in many different ways. Opal is the birthstone for October.

Karatz GemMagazine
" Boulder Opal "

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Sold out 【大人用】宝石磨きに挑戦してみよう「自分で出来る原石磨きセット」(初心者向け:バイカラーフローライト)・ボルダーオパール付※原石磨きコンテスト対象 ※
Sold out オーストラリア産ボルダーオパール 52.582ctルース
Sold out オーストラリア産ボルダーオパール 1.027ctルース
Sold out オーストラリア産ボルダーオパール 9.020ctルース
Sold out ボルダーオパール 7.680ctルース
Sold out オーストラリア産ボルダーオパール 12.603ctルース
Sold out ボルダーオパール 1.454ctルース
Sold out ボルダーオパール 1.80ctルース
Sold out 【12525402掲載】ボルダーオパール 11.940ctルース
Sold out ボルダーオパール 3.930ctルース
Sold out 【12526087掲載】ボルダーオパール 6.980ctルース
Sold out ボルダーオパール 0.405ctルース - KARATZ STORE|カラッツSTORE
Sold out ボルダーオパール 73.882ctルース - KARATZ STORE|カラッツSTORE

KARATZ Custom Made

Why not take your favorite gemstone that you found at KARATZ and have it made into custom-made jewelry? It will be made by skilled Japanese craftsmen.
We carefully craft each piece of jewelry, starting with the stone setting, to match the individual characteristics of the gemstone.

KARATZ・Five Commitments

So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.

KARATZ's Initiatives and Social Contributions

We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.

KARATZ Books

These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.

jeweler's tools

For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.