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5 major gems

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Sold out ネパール産カイヤナイト 2.863ctルース

2.863ct Loose Nepali Kyanite (Royal Blue Color)
Sold out マダガスカル産パパラチアサファイア 0.282ctルース

Madagascar Paparadscha Sapphire 3.9mm/0.282ct Loose Stone DGL Certified
coming soon 【12563038掲載】カシミール産非加熱サファイア 0.300ctルース

[Lottery Sale 0818_11] Unheated Kashmir Sapphire 0.300ct Loose Stone GIA Sale price¥128,000
Sold out Pt950 アイスブルーダイヤモンド リング

Pt950 Ice Blue Diamond Ring
Sold out 【32501858掲載】グレーダイヤモンド 0.141ctルース(FANCY GRAY, I-1)

Loose Gray Diamond 0.141ct (FANCY GRAY, I-1)
Sold out Gray Diamond 0.200ct Loose (FANCY DARK GRAY, SI-2)

Gray Diamond 0.200ct Loose (FANCY DARK GRAY, SI-2)
Sold out オーストラリア産ブラックオパール 0.588ctルース

Australian black opal 0.588ct loose
Sold out エメラルド 2.498ctルース

[Clover in cut] Emerald 9mm/2.498ct {Collaboration} Loose with patch
Sold out コロンビア産エメラルド 2.018ctルース

[Koshu precious stone cutter pluethree] Colombian emerald 2.018ct loose
Sold out Montana Sapphire 0.561ct loose (bicolor sapphire)

Montana Sapphire 0.561ct loose (bicolor sapphire)
Sold out 【12562021掲載】ファイアオパール 6.742ctルース

Mexican fire opal 6.742ct loose

Sold out 【12561997掲載】メキシコ産ファイアオパール 1.461ctルース

Mexican Fire Opal 1.461ct Loose (Egg-in-Opal)

Sold out コッパールチルクォーツ 1.747ctルース

Copper rutilated quartz 1.747ct loose

Sold out 【12548254掲載】パパラチアサファイア 0.474ctルース

[12548254 published] Padparadscha sapphire 0.474ct loose
coming soon Pink diamond 2.2mm/0.041ct loose (FANCY LIGHT PURPLE PINK, SI2)

Pink diamond 2.2mm/0.041ct loose (FANCY LIGHT PURPLE PINK, SI2) Sale price¥49,800
Sold out Pink diamond 2.2mm/0.043ct loose (FANCY LIGHT PURPLISH PINK, SI2)

Pink diamond 2.2mm/0.043ct loose (FANCY LIGHT PURPLISH PINK, SI2)
Sold out Diamond 0.777ct loose (butterfly cut)

Diamond 0.777ct loose (butterfly cut)
Sold out Gray Diamond 0.079ct Loose (FANCY DARK GRAY, I-1)

Gray Diamond 0.079ct Loose (FANCY DARK GRAY, I-1)

Sold out Australian boulder opal 6.152ct loose

Australian boulder opal 6.152ct loose

Sold out Mexican Fire Opal 0.362ct Loose

Mexican Fire Opal 0.362ct Loose
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 Mexican Water Opal 4.8mm/0.289ct Loose

Mexican Water Opal 4.8mm/0.289ct Loose
Sold out 【クローバーインカット】コロンビア産エメラルド 8mm/1.663ctルース《コラボ》 ワッペン付

[Clover in-cut] Colombian emerald 8mm/1.663ct loose "Collaboration" with patch
Sold out Star Ruby from Sri Lanka, 5.0mm/1.062ct Loose Stone, with Identification Report

Star Ruby from Sri Lanka, 5.0mm/1.062ct Loose Stone, with Identification Report
Sold out メキシコ産ファイアオパール 0.728ctルース

Mexican Fire Opal 0.728ct Loose

Sold out コンクパール（火焔模様有り） 0.387ctルース

Conch pearl (with flame pattern) 0.387ct loose

Sold out Diamond 0.120ct loose (G, VS2, Excellent H&C)

Diamond 0.120ct loose (G, VS2, Excellent H&C)
Sold out White Diamond 6.2mm/0.988ct Loose (FANCY WHITE, I2)

White Diamond 6.2mm/0.988ct Loose (FANCY WHITE, I2)

Sold out オーストラリア産ホワイトオパール 4.170ctルース

Australian white opal 4.170ct loose

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 カシミール産非加熱サファイア 0.260ctルース

Unheated Kashmir Sapphire 0.260ct Loose Stone GIA

Sold out カシミール産非加熱サファイア 0.210ctルース

Unheated Kashmir sapphire 0.210ct loose GIA

Sold out モザンビーク産ピンクサファイア 0.213ctルース（ホットピンクサファイア）

Pink sapphire from Mozambique 0.213ct loose (hot pink sapphire)

Sold out ダイヤモンド 0.131ctルース(F, VS-1)

Diamond 0.131ct loose (F, VS-1, octagonal cut)

Sold out 加熱ルビー 4.5mm/0.430ctルース GIT

Unheated Ruby 4.5mm/0.430ct Loose GIT
Sold out メキシコ産ファイアオパール 0.345ctルース

Mexican Fire Opal 5.8mm/0.345ct Loose Stone
Sold out Ruby 0.295ct loose

Ruby 0.295ct loose

Sold out パパラチアサファイア 0.376ctルース

Padparadscha Sapphire 0.376ct Loose Stone
Sold out スリランカ産パープルスターサファイア 2.185ctルース

Sri Lankan Purple Star Sapphire 2.185ct Loose

Sold out 【32501456掲載】ピンクダイヤモンド（プリンセスカット） 0.089ctルース(FANCY LIGHT PURPLISH PINK, I-1)

[Posted in 32501456] Pink Diamond (Princess Cut) 0.089ct Loose (FANCY LIGHT PURPLISH PINK, I-1)

Sold out イエローダイヤモンド 0.121ctルース(FANCY INTENSE YELLOW, VS-1)

[Posted in 32501431] Yellow Diamond 0.121ct Loose (FANCY INTENSE YELLOW, VS-1)

Sold out イエローダイヤモンド 0.706ctルース(FANCY DEEP ORANGY YELLOW, I-1)

[Posted in 32501430] Yellow Diamond 0.706ct Loose (FANCY DEEP ORANGY YELLOW, I-1)

Sold out 【NOBU氏】アマゾン産グリーンオパール 《コラボ》6.8mmルース - カラッツSTORE

[Mr. NOBU] Green Opal from Amazon [Collaboration] 6.8mm loose
Sold out 【猫カット】アマゾン産グリーンオパール 6.5mm/0.580ctルース

[Cat cut] Amazon green opal 6.5mm/0.580ct loose
Sold out ブルーサファイア 0.314ctルース

Loose Blue Sapphire 4.0mm/0.314ct
Sold out 【32501256掲載】イエローダイヤモンド 0.167ctルース(FANCY VIVID ORANGY YELLOW, VS-2)

[Posted in 32501256] Yellow Diamond 0.167ct Loose (FANCY VIVID ORANGY YELLOW, VS-2)

Sold out グリーンイエローダイヤモンド 0.502ctルース(VERY LIGHT GREEN YELLOW, I1)

Green yellow diamond 5mm/0.502ct loose (VERY LIGHT GREEN YELLOW, I1)

Sold out ブルーサファイア 0.417ctルース

0.417ct loose blue sapphire from Madagascar

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.