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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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[12/12 10 PM Sale] Limited to 15 stones! Includes a rare UNEVEN Fancy color gemstone (normally ¥39,800) and a 0.428ct Fancy color gemstone (¥69,800). Get one loose yellow diamond! Discounts available for multiple purchases.

[12/12 10 PM Sale] Limited to 15 stones! Includes a rare UNEVEN Fancy color gemstone (normally ¥39,800) and a 0.428ct Fancy color gemstone (¥69,800). Get one loose yellow diamond! Discounts available for multiple purchases. Sale price¥3,980
ダイヤモンド原石（メイカブル） 0.247ct原石

Yellow diamond rough stone (makeable) 0.247ct rough stone Sale price¥22,800
【32501524掲載】ピンクダイヤモンド 0.070ctルース(FANCY VIVID PINK PURPLE, I-1)

Purple Diamond 0.070ct Loose (FANCY VIVID PINK PURPLE, I-1) Sale price¥188,000
ダイヤモンド 0.052ctルース（トラペーズカット,VSクラス相当）

Diamond 0.052ct loose (trapeze cut, VS class equivalent) Sale price¥6,980
[12/9 22:00 Sale] Internally Flawless Diamond (H&C) 3.8mm/0.210ct Loose (F, IF, 3 Excellent H&C) GIA & Chuho

[12/9 22:00 Sale] Internally Flawless Diamond (H&C) 3.8mm/0.210ct Loose (F, IF, 3 Excellent H&C) GIA & Chuho Sale price¥69,800
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

[Shinjuku Marui Annex 202511] [12/5 22:00] Internally Flawless Diamond (H&C) 4.45mm/0.305ct Loose (F, IF, 3 Excellent H&C) Sale price¥98,000
H&C（ハート&キューピッド）専用スコープ（ダイヤモンド 専用スコープ) - カラッツSTORE

[Jeweler's Tools] H&C (Heart & Cupid) Special Scope (Diamond Special Scope) Sale price¥1,580
Ice blue diamond 1.2mm or 2.0mm 1 stone (VS class equivalent, round cut) {Multiple purchase discount available}

Ice blue diamond 1.2mm or 2.0mm 1 stone (VS class equivalent, round cut) {Multiple purchase discount available} Sale priceFrom ¥4,980
H&C (Heart & Cupid) Diamond 2.0mm Loose (VS Class, DG Class, 2mm Melee Diamonds) {Multiple Purchase Discounts Available}

H&C (Heart & Cupid) Diamond 2.0mm Loose (VS Class, DG Class, 2mm Melee Diamonds) {Multiple Purchase Discounts Available} Sale price¥7,980
Lab-Grown Diamond (Synthetic Diamond) [HPHT Method] Single Loose Stone (2.0mm, 2.2mm, 2.4mm, 2.6mm) [Multiple Purchase Discounts Available]

Lab-Grown Diamond (Synthetic Diamond) [HPHT Method] Single Loose Stone (2.0mm, 2.2mm, 2.4mm, 2.6mm) [Multiple Purchase Discounts Available] Sale priceFrom ¥1,580
Rose cut diamond 1.2mm x 1 stone (VS-SI class, DH color, melee diamonds) {Multiple purchase discounts available}

Rose cut diamond 1.2mm x 1 stone (VS-SI class, DH color, melee diamonds) {Multiple purchase discounts available} Sale price¥2,980
Diamond 1.2mm (VS class, DG color, round cut, melee diamond) 1 loose stone {Multiple purchase discounts available}

Diamond 1.2mm (VS class, DG color, round cut, melee diamond) 1 loose stone {Multiple purchase discounts available} Sale price¥1,980
H&C (Hearts & Cupids) Diamond 1.2mm Loose (VS Class, DG Class, Melee Diamonds) {Multiple Purchase Discounts Available}

H&C (Hearts & Cupids) Diamond 1.2mm Loose (VS Class, DG Class, Melee Diamonds) {Multiple Purchase Discounts Available} Sale price¥3,980
グリーンダイヤモンド（トリートメント）1石（約1.3mm)

Green Diamond (Treatment) 1 stone (approx. 1.3mm)《Multiple purchase discount available》 Sale price¥3,580
[On sale from 10pm on 12/7] {Limited to 40 stones} Salt and pepper diamond (2mm, melee diamond) 1 loose stone {Multiple purchase discounts available}

[On sale from 10pm on 12/7] {Limited to 40 stones} Salt and pepper diamond (2mm, melee diamond) 1 loose stone {Multiple purchase discounts available} Sale price¥2,980
1 blue fluorescent diamond (H&C, 3EX, VS-SI class equivalent, 2.0mm) {Multiple purchase discount available}

1 blue fluorescent diamond (H&C, 3EX, VS-SI class equivalent, 2.0mm) {Multiple purchase discount available} Sale price¥8,980
Diamond (Old Mine Cut) 1 Loose Stone {Multiple Purchase Discounts Available}

Diamond (Old Mine Cut) 1 Loose Stone {Multiple Purchase Discounts Available} Sale price¥4,980
Limited to 9 sets Diamond Gacha 💎 Yellow Diamond Rough Stone and Loose Stone Set of 2 《Multiple Purchase Discounts Available》

Limited to 9 sets Diamond Gacha 💎 Yellow Diamond Rough Stone and Loose Stone Set of 2 《Multiple Purchase Discounts Available》 Sale price¥2,980
H&C(ハート&キューピッド)ダイヤモンド1.2mmルース - カラッツSTORE

H&C (Hearts & Cupids) Diamond 1.5mm Loose (VS Class, DG Class, Melee Diamonds) {Multiple Purchase Discounts Available} Sale price¥4,980
Diamond loose sorting transition fee

Diamond loose sorting transition fee Sale price¥3,000
Limited to 14 stones: Lab-grown diamond (cabochon cut, approximately 2.3mm) - 1 loose stone. Discounts available for multiple purchases.

Limited to 14 stones: Lab-grown diamond (cabochon cut, approximately 2.3mm) - 1 loose stone. Discounts available for multiple purchases. Sale price¥4,980
[Available at 10 PM on November 24th] Limited Edition (12 stones) VS Equivalent Fluorescent Diamond Gacha with Bonus Mini Slice Diamond (Multiple Purchase Discounts Available)

[Available at 10 PM on November 24th] Limited Edition (12 stones) VS Equivalent Fluorescent Diamond Gacha with Bonus Mini Slice Diamond (Multiple Purchase Discounts Available) Sale price¥6,980
ダイヤモンド 0.061ctルース（トラペーズカット,VSクラス相当）

Diamond 0.061ct loose (trapeze cut, VS class equivalent) Sale price¥7,980
ダイヤモンド 0.042ctルース（トラペーズカット,VSクラス相当）

Diamond 0.042ct loose (trapeze cut, VS class equivalent) Sale price¥6,980
ダイヤモンド 0.039ctルース（トラペーズカット,VSクラス相当）

Diamond 0.039ct loose (trapeze cut, equivalent to VS class) Sale price¥5,980
ダイヤモンド原石（メイカブル） 0.185ctルース（VS-SI）

Rough diamond (makeable) 0.185ct loose (VS-SI) Sale price¥19,800
ダイヤモンド原石（メイカブル） 0.345ctルース（VS-SI相当）

Rough diamond (makeable) 0.345ct loose (VS-SI equivalent) Sale price¥29,800
K18YG アメリカ産オレゴンサンストーン 0.44ct・ピンクダイヤモンド・オレンジスピネル リング

18K Yellow Gold American Oregon Sunstone 0.44ct, Pink Diamond, Orange Spinel Ring Sale price¥158,000
[Shinjuku Marui Annex 202511] Fancy Intense Purple Pink Diamond 0.021ct Loose (FANCY INTENSE PURPLE PINK, SI2)

[Shinjuku Marui Annex 202511] Fancy Intense Purple Pink Diamond 0.021ct Loose (FANCY INTENSE PURPLE PINK, SI2) Sale price¥39,800
ラボグロウンダイヤモンド（合成ダイヤモンド） 0.290ctルース(FANCY VIVID PINK, VS-2)

Lab-grown Diamond (Synthetic Diamond) 0.290ct Loose (FANCY VIVID PINK, VS-2) Sale price¥45,800
ピンクダイヤモンド 0.051ctルース(FANCY LIGHT PINK, SI-2)

[Posted 32501454] Pink Diamond 0.051ct Loose (FANCY LIGHT PINK, SI-2) Sale price¥39,800
南アフリカ産ダイヤモンド原石（ソーヤブル） 0.105ct原石

South African rough diamond (sawable) 0.105ct rough (with trigon) Sale price¥39,800
フローレスダイヤモンド（H&C） 0.266ctルース(D, FL, 3Excellent H&C)

Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan Sale price¥188,000
Pt950 Myanmar gray spinel (platinum spinel) 5.5mm/0.685ct black diamond ring

Pt950 Myanmar gray spinel (platinum spinel) 5.5mm/0.685ct black diamond ring Sale price¥128,000
ダイヤモンド 0.618ctルース(I, I1,ツリーカット)

Diamond 0.618ct loose (I, I1, tree cut) Sale price¥128,000
ダイヤモンド原石（メイカブル） 0.353ctルース

Rough diamond (makeable) 0.353ct loose Sale price¥25,800
ダイヤモンド原石（メイカブル） 0.279ctルース

Rough diamond (makeable) 0.279ct loose Sale price¥25,800
ダイヤモンド 2.810ct原石

Diamond 2.810ct rough stone Sale price¥9,800
スライストラピッチェダイヤモンド 0.228ctルース

[On sale at 10pm on August 19th] Sliced ​​Trapiche Diamond 0.228ct Loose Sale price¥18,800
ソルトアンドペッパーダイヤモンド 5.2mm/0.863ctルース（カボションカット）

Salt and Pepper Diamond 5.2mm/0.863ct Loose (Cabochon Cut) Sale price¥98,000
南アフリカ産グリーンダイヤモンド原石（メイカブル） 0.298ctルース

South African green diamond rough (makeable) 0.298ct loose Sale price¥69,800
ダイヤモンド（カボションカット） 0.196ctルース

Diamond (cabochon cut) 0.196ct loose Sale price¥29,800
ダイヤモンド 0.430ct原石

South African diamond rough stone 0.430ct Sale price¥9,800
イエローダイヤモンド（カボションカット） 0.237ctルース

Yellow Diamond (Cabochon Cut) 0.237ct Loose Sale price¥35,800
イエローダイヤモンド（カボションカット） 0.176ctルース

Yellow Diamond (Cabochon Cut) 0.176ct Loose Sale price¥29,800
ダイヤモンド 0.245ctルース(E, VS-1)

Diamond 0.245ct loose stone (E, VS-1, octagon brilliant cut) Sale price¥39,800
ブルーダイヤモンド（トリートメント） 0.139ctルース(Fancy Greenish Blue, SI1)

Ice Blue Diamond (Treatment) 3.2mm/0.139ct Loose (Fancy Greenish Blue, SI1) Sale price¥22,800
ブルーダイヤモンド（トリートメント） 0.095ctルース(Fancy Greenish Blue, SI1)

Ice Blue Diamond (Treatment) 2.8mm/0.095ct Loose (Fancy Greenish Blue, SI1) Sale price¥19,800

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.