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Sold out Spinel 0.310ct loose

Spinel 0.310ct loose
Sold out Synthetic cobalt spinel 1.886ct loose stone

Synthetic cobalt spinel 1.886ct loose stone
Sold out Synthetic spinel 1.793ct loose stone

Synthetic spinel 1.793ct loose stone
Sold out Synthetic sapphire 1.416ct loose stone (synthetic pink sapphire)

Synthetic sapphire 1.416ct loose stone (synthetic pink sapphire)
Sold out 2.077ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)

2.077ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)
Sold out 2.393ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)

2.393ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)
Sold out 0.559ct Sri Lankan Chrysoberyl Cat's Eye Loose Stone

0.559ct Sri Lankan Chrysoberyl Cat's Eye Loose Stone
Sold out American peridot 0.334ct loose stone

American peridot 0.334ct loose stone
Sold out ナイジェリア産グリーンベリル 0.258ctルース

[On Sale at 10 PM on December 6th] Nigerian Green Beryl 0.258ct Loose Stone
Sold out Have fun guessing what you'll receive! Gacha set of two gemstones (including rare stones) (Multiple purchase discounts available)

Have fun guessing what you'll receive! Gacha set of two gemstones (including rare stones) (Multiple purchase discounts available)
Sold out Diamond gacha featuring a 0.072ct FANCY DEEP pink diamond, normally priced at 70,000 yen, and ice blue diamonds equivalent to VS class. (Multiple purchase discounts available)

Diamond gacha featuring a 0.072ct FANCY DEEP pink diamond, normally priced at 70,000 yen, and ice blue diamonds equivalent to VS class. (Multiple purchase discounts available)
Sold out Limited Edition of 10 Blue Gemstones! 💎 0.142ct Brazilian Paraiba Tourmaline, Euclase from Zimbabwe, 1.17ct Cobalt Spinel (Certificate of Authenticity: Color Shift), Benitoite, and More! Discounts Available for Multiple Purchases!

Limited Edition of 10 Blue Gemstones! 💎 0.142ct Brazilian Paraiba Tourmaline, Euclase from Zimbabwe, 1.17ct Cobalt Spinel (Certificate of Authenticity: Color Shift), Benitoite, and More! Discounts Available for Multiple Purchases!
Sold out Internally Flawless Diamond (H&C) 3.8mm/0.210ct Loose (F, IF, 3 Excellent H&C) GIA & Chuho

Internally Flawless Diamond (H&C) 3.8mm/0.210ct Loose (F, IF, 3 Excellent H&C) GIA & Chuho
Sold out チタン酸ストロンチウム 0.410ctルース

Strontium titanate 4.2mm/0.410ct loose stone
Sold out モザンビーク産パライバトルマリン 0.229ctルース

Paraiba tourmaline from Mozambique 0.229ct loose
Sold out クリソベリルキャッツアイ 2.283ctルース

Chrysoberyl cat's eye 2.283ct loose
Sold out ブラジル産インペリアルトパーズ 0.359ctルース

Brazilian imperial topaz 0.359ct loose

Sold out Lazurite in quartz 0.353ct loose

Lazurite in quartz 0.353ct loose

Sold out Lazurite in quartz 0.877ct loose

Lazurite in quartz 0.877ct loose

Sold out Lazurite in quartz 0.959ct loose

Lazurite in quartz 0.959ct loose

Sold out Blue tourmaline 0.369ct loose Japanese-German book

Blue tourmaline 0.369ct loose Japanese-German book

coming soon Myanmar orange jade (jade) 0.531ct loose

Myanmar orange jade (jade) 0.531ct loose Sale price¥4,980
Sold out ジンバブエ産バイカラーユークレース 0.197ctルース

Bicolor Euclase from Zimbabwe 0.197ct loose

coming soon チベット産バイカラーアンデシン 1.856ctルース

Tibetan bicolor andesine 1.856ct loose Sale price¥16,800
Sold out Canadian rough diamond (sawable) 0.099ct rough with trigon

Canadian rough diamond (sawable) 0.099ct rough with trigon
Sold out 0.628ct Pink Star Sapphire Loose Gemstone from Sri Lanka

0.628ct Pink Star Sapphire Loose Gemstone from Sri Lanka
Sold out USA Oregon Sunstone 1.869ct Loose

USA Oregon Sunstone 1.869ct Loose
Sold out USA Oregon Sunstone 2.160ct Loose

USA Oregon Sunstone 2.160ct Loose
Sold out 1.676ct loose Oregon sunstone from the United States

1.676ct loose Oregon sunstone from the United States
Sold out US Oregon Sunstone, 1.640 ct, Loose

US Oregon Sunstone, 1.640 ct, Loose
Sold out US Oregon Sunstone, 1.640 ct, Loose

US Oregon Sunstone, 1.640 ct, Loose
Sold out USA Ant Hill Garnet 4.0mm/0.277ct Loose Stone

USA Ant Hill Garnet 4.0mm/0.277ct Loose Stone
Sold out American Anthill Garnet 5.0mm/0.641ct Loose

American Anthill Garnet 5.0mm/0.641ct Loose
Sold out Unmounted American Anthill Garnet, 4.0mm/0.269ct

Unmounted American Anthill Garnet, 4.0mm/0.269ct
Sold out Anthill garnet from the USA (with forsterite) 0.578ct loose

Anthill garnet from the USA (with forsterite) 0.578ct loose

Sold out Golden Hill Turquoise from Kazakhstan, 2.235ct loose stone

Golden Hill Turquoise from Kazakhstan, 2.235ct loose stone
Sold out Golden Hill Turquoise from Kazakhstan, 2.882ct loose stone

Golden Hill Turquoise from Kazakhstan, 2.882ct loose stone
Sold out Golden Hill Turquoise from Kazakhstan, 2.524ct Loose Stone

Golden Hill Turquoise from Kazakhstan, 2.524ct Loose Stone
Sold out [Sakura In-Cut] Sapphire from Ratnapura, Sri Lanka, 6.0mm/0.839ct Loose

[Sakura In-Cut] Sapphire from Ratnapura, Sri Lanka, 6.0mm/0.839ct Loose
Sold out Fun Gem Gacha! 💎 Get diamonds (normally 29,800 yen) (D/VS/3EX H&C with Medium Certificate), special cut Oresund and Unloved, and more! (Multiple purchase discounts available)

Fun Gem Gacha! 💎 Get diamonds (normally 29,800 yen) (D/VS/3EX H&C with Medium Certificate), special cut Oresund and Unloved, and more! (Multiple purchase discounts available)

Sold out [Koshu Precious Stones plusthree] Brazilian Garden Quartz 47.809ct Loose

[Koshu Precious Stones plusthree] Brazilian Garden Quartz 47.809ct Loose

Sold out 18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring

18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring
Sold out Native Copper (1 rough stone) (average 22 carats) {Multiple purchase discounts available}

Native Copper (1 rough stone) (average 22 carats) {Multiple purchase discounts available}
coming soon ガーデンクォーツ 23.495ctルース

Garden quartz 23.495ct loose Sale price¥3,980
Sold out トリフィライトインクォーツ 13.378ctルース

Triphyllite in quartz 13.378ct loose
Sold out パイライトインクォーツ 34.864ctルース

Pyrite in quartz 34.864ct loose
Sold out スモーキークォーツ 0.691ctルース

[Koshu precious stone Kiriko plusthree] Smoky quartz 6mm/0.691ct loose with patch
Sold out 奈良県天川村産レインボーガーネット（アンドラダイトガーネット） 1.447ctルース

Rainbow garnet (andradite garnet) from Tenkawa Village, Nara Prefecture 1.447ct loose

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.