Birthstone list

Unheated Color Change Blue Sapphire 1.450ct Loose GIT Sale price¥158,000

Sri Lankan Star Sapphire 7.976ct Loose Sale price¥98,000

Russian Demantoid Garnet 3.0mm/0.194ct Loose Stone Sale price¥18,800

Brazilian bicolor tourmaline cat's eye 2.640ct loose stone Sale price¥12,800

ブラジル産パライバトルマリン 0.225ct原石（ CuO:2.1%、MnO:0.9%）

Brazilian Paraiba tourmaline 0.225ct raw stone (CuO:2.1%, MnO:0.9%) Sale price¥8,800

Colombian emerald cat's eye 0.108ct loose Sale price¥8,800

South African diamond rough stone 0.210ct Sale price¥8,800

Madagascar Purple Sapphire 0.342ct Loose Stone Sale price¥12,800

Colombian pyrite emerald 2.380ct rough stone Sale price¥29,800

South African diamond rough (makeable) 0.284ct loose (VS-SI class equivalent) Sale price¥25,800

ロシア産デマントイドガーネットキャッツアイ（ホーステール認む） 0.147ctルース

[On sale from 10pm on 5/6] Russian Demantoid Garnet Cat's Eye (Horsetail Recognized) 2.7mm/0.147ct Loose Stone Sale price¥29,800

Australian Boulder Opal 6.160ct Loose Sale price¥18,800

Australian Boulder Opal 4.980ct Loose Sale price¥19,800

[On sale from 10pm on 5/6] K18YG Cambodian blue zircon 0.51ct diamond ring Sale price¥79,800

Tanzanian bicolor sapphire 0.202ct loose stone Sale price¥18,800

[On sale from 22:00 on 5/5] Pt950 Brazilian Swiss Blue Topaz 0.756ct Aquamarine Ring Sale price¥79,800

K18PG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） 0.72ct・デマントイドガーネットリング

K18PG Rainbow Garnet (Andradite Garnet) from Tenkawa Village, Nara Prefecture 0.72ct Demantoid Garnet Ring Sale price¥89,800

South African Diamond Rough (Sawable) 0.107ct Rough Trigon Sale price¥42,800

[On sale from 10pm on 5/5] Illusion pink tourmaline (iridescent tourmaline) 4.097ct loose stone Sale price¥55,800

[On sale from 22:00 on 5/5] Mozambique Illusion Paraiba Tourmaline 5.357ct loose stone (CuO: 0.2%, MnO: 4.6%) Sale price¥98,000

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） 1.090ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 1.090ct loose stone Sale price¥9,800

Indian Star Garnet 11.440ct Loose Stone (6 Rows) Sale price¥5,980

[On sale from 10pm on 5/4] Russian oil-free emerald 0.84ct loose GIA Sale price¥248,000

Mexican Cantera Opal 18.00ct Loose Sale price¥29,800

インターナリーフローレスダイヤモンド（H&C） 4.45mm/0.305ctルース(F, IF, 3Excellent H&C) GIA&中宝

[On sale from 10pm on 5/3] Internally Flawless Diamond (H&C) 4.45mm/0.305ct Loose (F, IF, 3Excellent H&C) GIA & Chuho Sale price¥98,000

Parasite Peridot 0.220ct Loose (Paracytic Peridot) Japanese-German Edition Sale price¥79,800

Tanzanian Almandine Garnet 1.190ct Loose Stone Sale price¥12,800

Mexican Fire Opal 1.320ct Loose Sale price¥13,800

Mexican water opal 0.404ct loose stone Sale price¥12,800

Mexican Opal 0.461ct Loose Sale price¥8,800

Australian Opal 0.371ct Loose Sale price¥8,800

Australian Opal 0.678ct Loose Sale price¥5,980

Australian Opal 0.423ct Loose Sale price¥6,980

Australian Opal 0.706ct Loose Sale price¥8,800

Australian Opal 0.633ct Loose Sale price¥9,800

Sapphire 0.328ct loose stone Sale price¥12,800

Madagascar Blue Sapphire 0.448ct Loose Sale price¥12,800

Sri Lankan Yellow Sapphire 0.209ct Loose Sale price¥15,800

Sri Lankan Yellow Sapphire 0.318ct Loose Sale price¥15,800

Sri Lankan Yellow Sapphire 0.349ct Loose Sale price¥15,800

Mali Garnet (Grossular/Andradite Garnet) 4.2mm/0.374ct Loose Stone with Certificate of Authenticity Sale price¥9,800

[On sale from 22:00 on 5/1] Mali Garnet (Grossular/Andradite Garnet) 4.2mm/0.398ct Loose Stone with Certificate of Authenticity from the Republic of Mali Sale price¥9,800

Mali Garnet (Grossular/Andradite Garnet) 4.2mm/0.457ct Loose Stone with Certificate of Authenticity Sale price¥9,800

Limited to 6 stones: 1 Brazilian Santa Maria aquamarine (March birthstone, princess cut 2.5mm) Multiple purchase discounts available Sale price¥2,980

ブラジル産パライバトルマリン 0.184ct原石（CuO:1.5%、MnO:0.6%）

Brazilian Paraiba tourmaline 0.184ct raw stone (CuO:1.5%, MnO:0.6%) Sale price¥12,800

ブラジル産パライバトルマリン 0.180ct原石（ CuO:1.8%、MnO:0.1%）

Brazilian Paraiba tourmaline 0.180ct raw stone (CuO:1.8%, MnO:0.1%) Sale price¥12,800

Colombian Trapiche Emerald 2.730ct Loose Sale price¥98,000

Tanzanian bicolor sapphire 0.279ct loose stone Sale price¥18,800

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.