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5 major gems

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Sold out Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Intense Pink) 1 stone loose (multiple purchase discount available)

Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Intense Pink) 1 stone loose (multiple purchase discount available)
Sold out Colombian emerald + Brazilian alexandrite (Hemachita mine) 2 stone set《Multiple purchase discount available》

Colombian emerald + Brazilian alexandrite (Hemachita mine) 2 stone set《Multiple purchase discount available》

Sold out エチオピア産オパール 1石（ラウンドカット,2.5mm）《複数購入割引有》

1 Ethiopian opal (round cut, 2.5mm)《Discount available for multiple purchases》

Sold out Ice blue sapphire & pink sapphire 2 stone set from Ratnapura, Sri Lanka (2.5mm, princess cut)《Multiple purchase discount available》

Ice blue sapphire & pink sapphire 2 stone set from Ratnapura, Sri Lanka (2.5mm, princess cut)《Multiple purchase discount available》

Sold out Gem Gacha💎Sapphire from Ratnapura, Sri Lanka (4.5mm-6.0mm, round cut)《Multiple purchase discounts available》

Gem Gacha💎Sapphire from Ratnapura, Sri Lanka (4.5mm-6.0mm, round cut)《Multiple purchase discounts available》

Sold out スリランカ産バイカラーサファイア1石 （カボションカット）

1 bicolor sapphire from Sri Lanka (cabochon cut)《Discount available for multiple purchases》

Sold out 「アヒマディ博士の宝石学」（サイン入り）＆合成ダイヤモンドと天然ダイヤモンド（H&C）＆H&Cスコープ3点セット - カラッツSTORE

"Dr. Ahimadi's Gemology" (signed) & Synthetic Diamonds and Natural Diamonds (H&C) & H&C Scope 3 Piece Set

Sold out [On sale from 10pm on November 3rd] {Limited to 4 stones} Blue sapphire from Madagascar (royal blue color, oval cut) {Multiple purchase discounts available}

[On sale from 10pm on November 3rd] {Limited to 4 stones} Blue sapphire from Madagascar (royal blue color, oval cut) {Multiple purchase discounts available}
Sold out {Only one left} 1 Sea Creature Gacha (Agate, Australian Opal) {Multiple purchase discounts available}

{Only one left} 1 Sea Creature Gacha (Agate, Australian Opal) {Multiple purchase discounts available}
Sold out [Limited to 6 stones] Sapphire Gacha💎 Tanzanian bicolor sapphire (including crescent sapphire, 3-4mm) [Multiple purchase discount available]

[Limited to 6 stones] Sapphire Gacha💎 Tanzanian bicolor sapphire (including crescent sapphire, 3-4mm) [Multiple purchase discount available]
Sold out Sapphire Gacha💎 Montana sapphire 1 loose stone (green-blue, 3×4mm) {Multiple purchase discounts available}

Sapphire Gacha💎 Montana sapphire 1 loose stone (green-blue, 3×4mm) {Multiple purchase discounts available}
Sold out 《限定10石》サファイア1石ルース（ヘキサゴナルカット,3mm）《複数購入割引有》

Hexagonal cut sapphire, 1 loose stone (3mm) {Multiple purchase discounts available}
Sold out ミントグリーンダイヤモンド1石ルース（トリリアントカット,SIクラス相当）《複数購入割引有》

[Limited to 9 stones] 1 mint green diamond loose (trilliant cut, SI class equivalent) [Multiple purchase discount available]
Sold out 1 bicolor sapphire (cabochon cut)《Multiple purchase discount》

1 bicolor sapphire (cabochon cut)《Multiple purchase discount》

Sold out Set of 2 stones: 1 YAG (yttrium aluminum garnet) stone (canary yellow, emerald cut) + 1 yellow sapphire rough stone (discount available for multiple purchases)

Set of 2 stones: 1 YAG (yttrium aluminum garnet) stone (canary yellow, emerald cut) + 1 yellow sapphire rough stone (discount available for multiple purchases)
Sold out ダイヤガチャ💎ピンクダイヤモンド1石【全てFancy Purple Pink】（約2mm、全品ソーティング付)《複数購入割引有》

Diamond Gacha💎1 pink diamond [all Fancy Purple Pink] (approx. 2mm, all items sorted)《Multiple purchase discount available》

Sold out 1 bicolor sapphire from Windsor, Tanzania, loose (round cut)《Discount available for multiple purchases》

1 bicolor sapphire from Windsor, Tanzania, loose (round cut)《Discount available for multiple purchases》

Sold out Diamond gacha💎Super rose cut diamond 1 stone loose《Multiple purchase discount available》

Diamond gacha💎Super rose cut diamond 1 stone loose《Multiple purchase discount available》
Sold out ミントグリーンダイヤモンド（トリートメント,Iクラス相当）1石

1 mint green diamond (treatment, equivalent to I class)

Sold out ハイアライトオパール（1.5ctUP） - KARATZ STORE｜カラッツSTORE

Hyalite Opal (1.5ctUP)

Sold out [On sale from 10/27 at 10pm] Limited to 4 stones Ice blue diamond (VS class equivalent, 2mm) 1 loose stone [Multiple purchase discounts available]

[On sale from 10/27 at 10pm] Limited to 4 stones Ice blue diamond (VS class equivalent, 2mm) 1 loose stone [Multiple purchase discounts available]
Sold out Pink Sapphire Gacha💎 (1 Padparadscha Sapphire 0.215ct with DGL Certificate) 1 Loose Stone {Multiple Purchase Discounts Available}

Pink Sapphire Gacha💎 (1 Padparadscha Sapphire 0.215ct with DGL Certificate) 1 Loose Stone {Multiple Purchase Discounts Available}
Sold out 1 Tanzania Windsor Sapphire (Multiple purchase discounts available)

1 Tanzania Windsor Sapphire (Multiple purchase discounts available)
Sold out Colombian mint color emerald 1 loose stone {Multiple purchase discount available}

Colombian mint color emerald 1 loose stone {Multiple purchase discount available}
Sold out [Limited 2 stones/Resale] Sea green diamond (treatment) (2mm, round cut, SI class equivalent) 1 stone loose

[Limited 2 stones/Resale] Sea green diamond (treatment) (2mm, round cut, SI class equivalent) 1 stone loose
Sold out 1 loose bicolor sapphire from Windsor, Tanzania (marquise cut, 4.5 x 2.5 mm)《Discount available for multiple purchases》

1 loose bicolor sapphire from Windsor, Tanzania (marquise cut, 4.5 x 2.5 mm)《Discount available for multiple purchases》
Sold out オーストラリア産オパール ルース 1石

1 loose Australian opal (discount available for multiple purchases)

Sold out グリーンランド産アイスルビー 1石（ハートシェイプ,4mm）

Ice ruby ​​from Greenland 1 stone (heart shape, 4mm) Comes with original pouch

Sold out Mint green diamond (treatment, VS to SI class equivalent) 1 stone

Mint green diamond (treatment, VS to SI class equivalent) 1 stone

Sold out コロンビア産エメラルド 1.400ct原石

Colombian emerald 1.40ct rough stone

Sold out 【12528364掲載】バイカラーサファイア 0.360ctルース

Bicolor sapphire 0.360ct loose

Sold out [Colorful] K18 diamond 0.55ct pendant (necklace)

[Colorful] K18 diamond 0.55ct pendant (necklace)

Sold out 【12523003掲載】ファイアオパール 0.769ctルース

Fire opal 0.769ct loose

Sold out Limited to 3 stones: 1 peridot green diamond loose stone (treated, 3mm, VS class, Chuho sorting) Multiple purchase discounts available

Limited to 3 stones: 1 peridot green diamond loose stone (treated, 3mm, VS class, Chuho sorting) Multiple purchase discounts available
Sold out [On sale from 10pm on 8/10] Limited to 2 stones: 1 London Blue Diamond (treated) loose stone (VS class equivalent, including round 3mm) [Multiple purchase discounts available]

[On sale from 10pm on 8/10] Limited to 2 stones: 1 London Blue Diamond (treated) loose stone (VS class equivalent, including round 3mm) [Multiple purchase discounts available]

Sold out シルキーダイヤモンド 2.6mm/0.081ctルース

Silky Diamond 2.6mm/0.081ct Loose
Sold out Limited to 4 sets: Brazilian emerald (sugarloaf cut) & Zambian emerald 2 stone set (multiple purchase discounts available)

Limited to 4 sets: Brazilian emerald (sugarloaf cut) & Zambian emerald 2 stone set (multiple purchase discounts available)
Sold out Sapphire Gacha💎 Sri Lankan Sapphire (Hexagonal Cut) 1 Loose Stone {Multiple Purchase Discounts Available}

Sapphire Gacha💎 Sri Lankan Sapphire (Hexagonal Cut) 1 Loose Stone {Multiple Purchase Discounts Available}
Sold out Sapphire Gacha💎 Sri Lankan Blue Sapphire (Hexagonal Cut) 1 Loose Stone {Multiple Purchase Discounts Available}

Sapphire Gacha💎 Sri Lankan Blue Sapphire (Hexagonal Cut) 1 Loose Stone {Multiple Purchase Discounts Available}
Sold out [Special offer] [Limited to 2 stones] 1 Australian black opal loose stone

[Special offer] [Limited to 2 stones] 1 Australian black opal loose stone
Sold out Bankacha sapphire 1 stone loose (black star sapphire)《Multiple purchase discount available》

Bankacha sapphire 1 stone loose (black star sapphire)《Multiple purchase discount available》
Sold out 1 bicolor sapphire (cabochon cut)《Multiple purchase discount》

1 bicolor sapphire (cabochon cut)《Multiple purchase discount》
Sold out 《訳あり》サンジェ氏カット（ウォーターメロントルマリン・イエローサファイア・オレゴンサンストーンなど）

Limited to 9 stones, with a flaw, Sanjay cut (watermelon tourmaline, yellow sapphire, Oregon sunstone, etc.), multiple purchase discounts available
Sold out 《限定5石》《訳あり》サファイア1石ルース（ロゼンジカット）《複数購入割引有》

《Limited 5 stones》《Explanation》1 sapphire stone loose (lozenge cut)《Multiple purchase discount available》
Sold out メキシコ産ファイアオパール 0.266ctルース

Mexican Fire Opal 0.266ct Loose (Faceted Cut)

Sold out ダイヤモンド0.210ct リング

K18 Internally Flawless Diamond 0.210ct Ring (D/IF/3EX/H&C) Chuho
Sold out [Sales end on January 8th 🎍] 2024 New Year lucky bag 🎍《E/IF/3EX/H&C/0.25ct or more, approximately 4mm or more, GIA & medium treasure diamond confirmed lucky bag》 Diamonds worth 200,000 yen

[Sales end on January 8th 🎍] 2024 New Year lucky bag 🎍《E/IF/3EX/H&C/0.25ct or more, approximately 4mm or more, GIA & medium treasure diamond confirmed lucky bag》 Diamonds worth 200,000 yen

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.

The fifth reprint has been decided and is now on sale at bookstores nationwide and online.

Written by KARATZ, book “Jewelry Illustrated Book”

The book provides explanations about over 300 types of gemstones, from new standard birthstones to rare stones that are hard to find, as well as a diary of our company representative, Mr. Koyama's, gemstone shopping experience in Thailand and Sri Lanka, and tips for photographing gemstones, allowing you to learn about the appeal of gemstones from various perspectives.

KARATZ・Five Commitments