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diamond

Diamond is the birthstone of April. This gemstone is sometimes called the king of gemstones. It is said to be the hardest gemstone on earth, and its strong shine is exceptionally beautiful. Colorless is the most common, but it comes in a variety of shades including yellow, pink, blue, orange, and green.

Karatz GemMagazine
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ダイヤモンド 0.128ctルース（カボションカット,マロンカット）

Diamond 0.128ct loose stone (cabochon cut, maroon cut) Sale price¥39,800
ロシア産ダイヤモンド原石（ソーヤブル） 0.094ct原石

Russian diamond rough (sawable) 0.094ct rough Sale price¥24,800
ロシア産ダイヤモンド原石（ソーヤブル） 0.098ctルース

Russian rough diamond (sawable) 0.098ct loose Sale price¥24,800
ダイヤモンド原石（ソーヤブル） 0.125ctルース

Russian rough diamond (sawable) 0.125ct loose Sale price¥29,800
イエローダイヤモンド 4mm/0.261ctルース(LIGHT YELLOW, VS-2, VeryGood)（セミオーダーメイドセット）

[Staff Selection] Yellow Diamond 4mm/0.261ct Loose (LIGHT YELLOW, VS-2, Very Good) (Semi-Custom Made Set) Sale price¥59,800
ロシア産ダイヤモンド原石（ソーヤブル） 0.101ctルース

Russian rough diamond (sawable) 0.101ct loose Sale price¥25,800
ダイヤモンド 0.534ct原石

Diamond 0.534ct ​​rough stone Sale price¥9,800
ダイヤモンド 0.348ctルース(I, SI1)

Diamond 0.348ct loose (I, SI1) Sale price¥59,800
イエローダイヤモンド 0.190ctルース(FANCY DEEP ORANGY YELLOW, SI2) - KARATZ STORE｜カラッツSTORE

Yellow diamond 0.190ct loose (FANCY DEEP ORANGY YELLOW, SI2) Sale price¥39,800
Sold out Diamond 2mm (VS class, DG color, round cut, melee diamond 2.0mm) 1 loose stone {Multiple purchase discounts available}

Diamond 2mm (VS class, DG color, round cut, melee diamond 2.0mm) 1 loose stone {Multiple purchase discounts available}
Sold out 「決定版 アンカットダイヤモンド」サイン入り初版本 ＆ダイヤモンド原石（グリーン蛍光）2点セット

"Definitive Uncut Diamond" by Kyoichi Suwa, signed first edition & 2-piece set of diamonds (hexagonal cut)

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 Lab-grown ice blue diamond set of two (synthetic diamond, VS class equivalent, 1mm) {Multiple purchase discount available}

Lab-grown ice blue diamond set of two (synthetic diamond, VS class equivalent, 1mm) {Multiple purchase discount available}
Sold out プリンセスカットダイヤモンド 2.0mm ルース（VSクラス相当）

Princess cut diamond 2.0mm loose (equivalent to VS class)《Multiple purchase discount available》

Sold out Gem Gacha💎 Trapiche Diamond (Sliced ​​Diamond) 1 stone {Multiple purchase discount available}

Gem Gacha💎 Trapiche Diamond (Sliced ​​Diamond) 1 stone {Multiple purchase discount available}

Sold out [On Sale May 29, 10 PM JST] 《Limited 13 Stones》Yellow Diamond Gacha, win a VVS-2/4.3mm/with Sorting Report worth 39,800 yen (regular price) 💎《Multiple Purchase Discount Available》

[On Sale May 29, 10 PM JST] 《Limited 13 Stones》Yellow Diamond Gacha, win a VVS-2/4.3mm/with Sorting Report worth 39,800 yen (regular price) 💎《Multiple Purchase Discount Available》
Sold out Limited to 10 stones: 1 London blue diamond loose (VS-SI class equivalent, 1.8mm) Multiple purchase discounts available

Limited to 10 stones: 1 London blue diamond loose (VS-SI class equivalent, 1.8mm) Multiple purchase discounts available
Sold out 《残り4石》ジェムガチャ💎ジンバブエ産ソーヤブルダイヤモンド1石（正八面体,VS~SIクラス相当） - カラッツSTORE

Gem Gacha💎1 Zimbabwe sawable diamond (regular octahedron, VS~SI class equivalent)

Sold out 《Shinjuku Pop-Up Event Commemorative Offer》《Limited Stock Remaining》 Color Diamond Set (including pink, ice blue, green diamonds, and more, 9 stones or more in total), valued at ¥30,000 normally. 《Multi-Purchase Discount Available》

《Shinjuku Pop-Up Event Commemorative Offer》《Limited Stock Remaining》 Color Diamond Set (including pink, ice blue, green diamonds, and more, 9 stones or more in total), valued at ¥30,000 normally. 《Multi-Purchase Discount Available》
Sold out A single loose pink diamond, including a fancy pink diamond, normally priced at 39,800 yen (multiple purchase discounts available)

A single loose pink diamond, including a fancy pink diamond, normally priced at 39,800 yen (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 to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]

Limited to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]
Sold out Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Light Pink) 1 stone loose (multiple purchase discount available)

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

Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Vivid Pink) 1 stone loose (multiple purchase discount available)
Sold out 1 rose cut diamond (VS-SI class equivalent, 3.0mm)《Multiple purchase discount available》

1 rose cut diamond (VS-SI class equivalent, 3.0mm)《Multiple purchase discount available》

Sold out Limited to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]

Limited to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]
Sold out Gem Gacha💎1 special fluorescent diamond (VS-SI class equivalent, 2.0mm)

Gem Gacha💎1 special fluorescent diamond (VS-SI class equivalent, 2.0mm)

Sold out Limited to 9 stones: 1 London Blue Diamond Loose (VS-SI class equivalent, 2.0mm) Multiple purchase discounts available

Limited to 9 stones: 1 London Blue Diamond Loose (VS-SI class equivalent, 2.0mm) Multiple purchase discounts available
Sold out [On sale July 5th, 10 PM JST] 《Limited 13 Stones》Unique Diamond Gacha - Including 1ct+ diamonds, round cut, rose cut, and fluorescent diamonds (with a bonus London Blue Diamond stone!) 《Multiple Purchase Discount Available》

[On sale July 5th, 10 PM JST] 《Limited 13 Stones》Unique Diamond Gacha - Including 1ct+ diamonds, round cut, rose cut, and fluorescent diamonds (with a bonus London Blue Diamond stone!) 《Multiple Purchase Discount Available》
Sold out [Sale begins 7/XX 10 PM JST] Limited 1 Set: Treated Diamond Set (approx. 1.2mm x 11 stones, 0.086ct) [Bulk purchase discount available]

[Sale begins 7/XX 10 PM JST] Limited 1 Set: Treated Diamond Set (approx. 1.2mm x 11 stones, 0.086ct) [Bulk purchase discount available]
Sold out [On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"

[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"
Sold out FANCY PURPLISH PINK/SI-1/with Pink Diamond Gacha (Multiple purchase discount available)

FANCY PURPLISH PINK/SI-1/with Pink Diamond Gacha (Multiple purchase discount available)
Sold out [Sale starts July 11th, 10 PM JST] Limited to 16 Stones! Pink Diamond Gacha with 2 FANCY Color Pink Diamonds (with sorting certificate), normally ¥39,800. Multiple Purchase Discount Available.

[Sale starts July 11th, 10 PM JST] Limited to 16 Stones! Pink Diamond Gacha with 2 FANCY Color Pink Diamonds (with sorting certificate), normally ¥39,800. Multiple Purchase Discount Available.
Sold out カメレオンダイヤモンド 0.118ctルース(LIGHT GRAYISH GREENISH YELLOW, VS-2)

Chameleon Diamond 3.1mm/0.118ct Loose Stone (LIGHT GRAYISH GREENISH YELLOW, VS-2)
Sold out Diamond rough (makeable) 0.353ct rough

Diamond rough (makeable) 0.353ct rough
Sold out Diamond rough (makeable) 0.279ct rough

Diamond rough (makeable) 0.279ct rough
Sold out 南アフリカ産ダイヤモンド原石（ソーヤブル） 0.083ct原石

South African diamond rough (sawable) 0.083ct rough

Sold out K18 翡翠（ヒスイ） 1.051ct ペンダントトップ（ネックレストップ）

[Listed 22602671] [Karahuri] K18 Jadeite (Jade) 1.051ct Pendant Top
Sold out K18WG ダイヤモンド 0.2ct ペンダントトップ（ネックレストップ）

[On sale July 20 at 10 PM] Colorful K18WG Diamond 0.2ct Pendant Top (Necklace Top)
Sold out K18WG ローズカットダイヤモンド 0.27ctリング 鑑別書

【On Sale July 20 at 10 PM】K18WG Rose-Cut Diamond 0.27ct Ring with Certificate
Sold out [On sale July 6th at 10 PM] Limited 1 set: 11-stone treated diamond set (approx. 1.2mm x 11 stones) [Multiple purchase discount available]

[On sale July 6th at 10 PM] Limited 1 set: 11-stone treated diamond set (approx. 1.2mm x 11 stones) [Multiple purchase discount available]
Sold out ダイヤモンド 0.197ctルース(K, VS-2, VeryGood)

[On sale July 4th at 10 PM] Diamond 3.7mm/0.197ct Loose (K, VS-2, VeryGood)
Sold out フローレスダイヤモンド（H&C） 0.290ctルース(D, FL, 3Excellent H&C)

【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab
Sold out フローレスダイヤモンド（H&C） 4.2mm/0.280ctルース(D, FL, 3Excellent H&C) GIA&中宝

【Lottery Sale 0620_09】Flawless Diamond (H&C) 4.2mm/0.280ct Loose Stone (D, FL, 3Excellent H&C) GIA&CGL
Sold out K14WG ブラックダイヤモンド 0.89ct ペンダントトップ（ネックレストップ）

[On sale June 25, 10 PM] [Colorful] K14WG Black Diamond 0.89ct / Diamond 0.13ct Pendant Top (Necklace Top) with Certificate of Authenticity
Sold out ダイヤモンド 0.144ctルース(I, VS1, Good)

[On sale 6/20 10 PM JST] Loose Diamond 3.4mm/0.144ct (I, VS1, Good)
Sold out グリーンダイヤモンド（トリートメント） 0.183ctルース(FANCY INTENSE YELLOW GREEN TREATED, VS1)

【On sale June 26th, 10 PM JST】 Apple Green Diamond (Treated) 3.6mm/0.183ct Loose (FANCY INTENSE YELLOW GREEN TREATED, VS1)

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.