Birthstone list

Brazilian Paraiba Tourmaline 0.341ct loose stone (CuO:1.81%, MnO:1.96%) Nakahokan analysis report Sale price¥598,000

Andesine Labradorite (also known as Rainbow Moonstone) 1.373ct loose stone Sale price¥12,800

Amethyst 4.249ct rough stone Sale price¥9,800

Unheated Brazilian Paraiba Tourmaline 0.081ct loose stone (CuO: 2.1%, MnO: 2.3%) Sale price¥98,000

Unheated Brazilian Paraiba Tourmaline 0.088ct loose stone (CuO: 1.9%, MnO: 2.3%) Sale price¥98,000

Unheated Brazilian Paraiba Tourmaline 0.059ct loose stone (CuO: 1.4%, MnO: 2.7%) Sale price¥63,800

Unheated Brazilian Paraiba Tourmaline 0.065ct loose stone (CuO: 2.0%, MnO: 2.4%) Sale price¥69,800

Unheated Brazilian Paraiba Tourmaline 0.066ct loose stone (CuO: 1.5%, MnO: 2.2%) Sale price¥69,800

Unheated Brazilian Paraiba Tourmaline 0.063ct loose stone (CuO: 1.8%, MnO: 2.4%) Sale price¥75,800

Unheated Brazilian Paraiba Tourmaline 0.061ct loose stone (CuO: 1.7%, MnO: 2.2%) Sale price¥69,800

Unheated Brazilian Paraiba Tourmaline 0.055ct loose stone (CuO: 1.9%, MnO: 2.2%) Sale price¥59,800

Unheated Brazilian Paraiba Tourmaline 0.066ct loose stone (CuO: 1.7%, MnO: 2.4%) Sale price¥79,800

Unheated Brazilian Paraiba Tourmaline 0.056ct loose stone (CuO: 1.7%, MnO: 2.3%) Sale price¥59,800

Unheated Brazilian Paraiba Tourmaline 0.062ct loose stone (CuO: 1.7%, MnO: 2.5%) Sale price¥69,800

Unheated Brazilian Paraiba Tourmaline 0.058ct loose stone (CuO: 2.0%, MnO: 2.2%) Sale price¥59,800

Unheated Brazilian Paraiba Tourmaline 0.056ct loose stone (CuO: 2.1%, MnO: 2.2%) Sale price¥69,800

Unheated Brazilian Paraiba Tourmaline 0.057ct loose stone (CuO: 1.6%, MnO: 2.4%) Sale price¥69,800

Pink tourmaline 0.692ct loose stone Sale price¥18,800

Pink tourmaline 0.845ct loose stone Sale price¥14,800

Yellow Opal 0.372ct Loose (Faceted Cut) Sale price¥8,800

0.421ct loose yellow sapphire from Ratnapura, Sri Lanka Sale price¥11,800

Mexican Hyalite Opal 1.215ct Loose (Faceted Cut) Sale price¥9,800

Tanzanian Mandarin Garnet 0.359ct Loose Stone Sale price¥22,800

Paraiba tourmaline from Brazil 0.057ct loose Sale price¥22,800

Paraiba tourmaline from Brazil 0.061ct loose Sale price¥25,800

Paraiba tourmaline from Brazil 0.049ct loose Sale price¥19,800

Paraiba Tourmaline from Mozambique 0.171ct loose stone Sale price¥8,980

Paraiba Tourmaline from Mozambique 0.153ct loose stone Sale price¥9,800

Paraiba Tourmaline from Mozambique 0.154ct loose stone Sale price¥9,800

Color change sapphire 0.473ct loose stone (purple sapphire) Sale price¥29,800

Paraiba tourmaline from Brazil 0.018ct loose Sale price¥14,800

Paraiba tourmaline from Brazil 0.023ct loose Sale price¥19,800

Madagascar Green Sapphire 0.253ct Loose Sale price¥9,800

Madagascar Yellow Sapphire 4.4mm/0.417ct Loose Sale price¥15,800

Madagascar Blue Sapphire 0.302ct Loose Sale price¥16,800

Madagascar pink sapphire 0.346ct loose stone Sale price¥16,800

Madagascar pink sapphire 0.243ct loose stone Sale price¥9,800

Bicolor tourmaline 4.448ct loose stone Sale price¥55,800

Tanzanite 1.891ct loose stone Sale price¥39,800

Sri Lankan Blue Sapphire 0.519ct Loose Sale price¥15,800

Tanzanite 1.116ct loose stone Sale price¥29,800

Tanzanian Rhodolite Garnet 1.157ct Loose Stone Sale price¥14,800

Ethiopian Opal 5.7mm/0.878ct Loose (Sphere) Sale price¥7,980

Mozambique Elbaite Tourmaline 1.793ct Loose Stone Sale price¥49,800

Paraiba tourmaline from Brazil 0.071ct loose Sale price¥25,800

Unheated Silky Pink Sapphire from Vietnam 2.4mm/0.078ct Loose Sale price¥4,980

Greenland sapphire 0.592ct loose stone Sale price¥24,800

Demantoid Garnet from Madagascar 0.169ct loose stone Sale price¥25,800

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.