Birthstone list

Brazilian Amethyst 9.749ct Loose Stone Sale price¥15,800

Indian Moonstone 8mm/1.879ct Loose Sale price¥6,980

Emerald 0.310ct loose Sale price¥12,800

Amethyst 9.860ct loose stone Sale price¥18,800

Nigerian bicolor tourmaline 0.379ct loose stone Sale price¥8,800

Canary Yellow Tourmaline from Mozambique 0.142ct loose stone Sale price¥8,800

Canary Yellow Tourmaline from Mozambique 0.170ct loose stone Sale price¥8,800

Tanzanite from Tanzania 0.272ct loose stone Sale price¥8,800

Tanzanian green sapphire 0.303ct loose stone Sale price¥9,800

Unheated Brazilian Paraiba Tourmaline 0.053ct loose stone (CuO: 1.4%, MnO: 3.1%) Sale price¥62,800

[12550851] 2.944ct Mozambique pink tourmaline loose stone Sale price¥49,800

[12550838] Brazilian Limonite in Topaz 4.680ct Loose Stone Sale price¥11,800

【スタッフセレクション】マダガスカル産バイカラーサファイア 0.330ctルース（セミオーダーメイドセット）

[Staff Selection] Madagascar Bicolor Sapphire 0.330ct Loose (Semi-Custom Made Set) Sale price¥47,800

[12551148] Australian black opal 3.890ct loose stone Sale price¥69,800

Paraiba Tourmaline from Mozambique 0.360ct loose stone Sale price¥18,800

非加熱ブラジル産パライバトルマリン 0.065ctルース（CuO:1.6%、MnO:2.4%）

Unheated Brazilian Paraiba Tourmaline 0.065ct loose stone (CuO: 1.6%, MnO: 2.4%) Sale price¥69,800

Colombian Trapiche Emerald 0.488ct Loose Sale price¥25,800

【KEN氏】ブラジル産グリーントルマリン 5.2mm/0.584ctルース（セミオーダーメイドセット）

[Staff Selection] [Mr. KEN] Brazilian Green Tourmaline 5.2mm/0.584ct Loose Stone (Semi-Custom Made Set) Sale price¥47,800

Russian rough diamond (sawable) 0.117ct loose Sale price¥29,800

Russian rough diamond (sawable) 0.101ct loose Sale price¥25,800

South African diamond rough (sawable) 0.110ct rough Sale price¥25,800

South African diamond rough (sawable) 0.085ct rough Sale price¥19,800

Brazilian Indigolite Tourmaline 7.002ct Loose Stone, Japan-Germany Exchange Sale price¥198,000

【スタッフセレクション】タンザニア産タンザナイト 0.262ctルース（セミオーダーメイドセッ

[Staff Selection] Tanzanite 0.262ct loose stone from Tanzania (semi-custom made set) Sale price¥74,800

【スタッフセレクション】【KEN氏】タンザニア産ピンクトルマリン 0.290ctルース（セミオーダーメイドセッ

[Staff Selection] [Mr. KEN] Tanzanian Pink Tourmaline 0.290ct Loose (Semi-Custom Made Set) Sale price¥74,800

【スタッフセレクション】マダガスカル産アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.450ctルース（セミオーダーメイドセッ

[Staff Selection] Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 0.450ct Loose Stone (Semi-Custom Made Set) Sale price¥47,800

[Staff Selection] Brazilian Santa Maria Aquamarine 5.1mm/0.523ct Loose Stone (Semi-Custom Made Set) Sale price¥47,800

[Staff Selection] Brazilian Green Tourmaline 0.475ct Loose (Semi-Custom Made Set) Sale price¥47,800

Diamond (cabochon cut) 0.206ct loose Sale price¥55,800

Unheated Brazilian Paraiba Tourmaline 0.052ct loose stone (CuO: 2.0%, MnO: 2.2%) Sale price¥55,800

非加熱ブラジル産パライバトルマリン 0.051ctルース（CuO:1.9%、MnO:2.5%）

Unheated Brazilian Paraiba Tourmaline 0.051ct loose stone (CuO: 1.9%, MnO: 2.5%) Sale price¥55,800

Sky blue topaz 1.719ct loose stone Sale price¥9,800

Ethiopian Opal 0.629ct Loose (Sphere) Sale price¥7,980

Spessartite Garnet from Madagascar 1.053ct loose stone Sale price¥29,800

アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.585ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 0.585ct loose stone Sale price¥12,800

Brazilian Pink Tourmaline 0.862ct Loose Stone Sale price¥15,800

Vietnam Aquamarine 0.398ct Loose Sale price¥6,980

Vietnam Aquamarine 0.461ct Loose Stone Sale price¥5,980

Brazilian Pink Tourmaline 0.470ct Loose Stone Sale price¥12,800

Brazilian Pink Tourmaline 0.561ct Loose Stone Sale price¥9,800

Brazilian pink tourmaline 0.968ct loose stone Sale price¥25,800

Vietnam Aquamarine 0.494ct Loose Stone Sale price¥8,800

Sky blue topaz 0.830ct loose stone Sale price¥6,980

Brazilian Blue Tourmaline 0.196ct Loose Sale price¥8,800

Sri Lankan Yellow Sapphire 0.312ct Loose Sale price¥8,800

Brazilian Green Tourmaline 2.218ct Loose Sale price¥29,800

Tanzanian pink tourmaline 0.558ct loose stone Sale price¥12,800

Mozambique Rubellite 0.410ct Loose Stone Sale price¥15,800

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.