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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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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 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 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 《Limited to 13 Stones》Unique Diamond Gacha - Includes 1ct+ Diamonds, Round Cuts, Rose Cuts, Fluorescent Diamonds (Bonus London Blue Diamond x 1) 《Multiple Purchase Discount Available》

《Limited to 13 Stones》Unique Diamond Gacha - Includes 1ct+ Diamonds, Round Cuts, Rose Cuts, Fluorescent Diamonds (Bonus London Blue Diamond x 1) 《Multiple Purchase Discount Available》
Sold out [On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available*

[On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple 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 "Limited 16 Stones" Pink Diamond Fancy Color (with sorting) two stones included - Pink Diamond Gacha, normally 39,800 JPY (multiple purchase discount available)

"Limited 16 Stones" Pink Diamond Fancy Color (with sorting) two stones included - Pink Diamond Gacha, normally 39,800 JPY (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 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 ダイヤモンド 0.380ctルース(D, VVS2, 3Excellent)

[#202607 Akihabara Pop-up Store Carry Out] [32501946 Listed] Diamond 0.380ct Loose (D, VVS2, 3Excellent) GIA
Sold out Pt900 コンクパール 0.56ct ダイヤモンド0.25ctリング鑑別書

[Lottery Sale 0829] Pt900 Conch Pearl 0.56ct Diamond 0.25ct Ring with Appraisal Certificate

Sold out 南アフリカ産ダイヤモンド原石（ソーヤブル） 0.280ct原石

【#202607 Akihabara Pop-up, Currently Out of Stock】【12563269 Posted】Rough Diamond (Sawable) from South Africa 0.280ct
Sold out [On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available*

[On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available*
Sold out Pt950 ピンクダイヤモンド 0.058ct（FANCY INTENSE PURPLE PINK）・ダイヤモンド0.11ctリング 中宝ソーティング

[Lottery Sale 0812_09] Pt950 Pink Diamond 0.058ct (FANCY INTENSE PURPLE PINK) / Diamond 0.11ct Ring, with Central Gem Lab Sorting

Sold out ダイヤモンド（H&C） 0.257ctルース(D, SI1, Excellent H&C)

Diamond (H&C) 0.257ct Loose (D, SI1, Excellent H&C)

Sold out ダイヤモンド（H&C） 0.504ctルース(F, VS-1, 3Excellent H&C)

Diamond (H&C) 0.504ct Loose (F, VS-1, 3Excellent H&C)

Sold out オレンジダイヤモンド 0.176ctルース(FANCY DEEP YELLOWISH ORANGE, I-1)

Orange Diamond 0.176ct Loose Stone (FANCY DEEP YELLOWISH ORANGE, I-1)
Sold out K10PG ダイヤモンド 0.05ct 一粒ペンダント（ネックレス）

[Carafull] K10PG Diamond 0.05ct Solitaire Pendant (Necklace)
Sold out Pt900/K18WG ダイヤモンド0.50ct ・ダイヤモンド0.07ctペンダント（ネックレス）

[COLORFUL] Pt900/K18WG 0.50ct Diamond / 0.07ct Diamond Pendant (Necklace)
Sold out K18WG ダイヤモンド 0.30ct ピアス

[Colorful] K18WG Diamond 0.30ct Earrings
Sold out K18 ダイヤモンド 0.07ct ペンダント（ネックレス）

[On sale August 1st, 10 PM] K18 Diamond 0.07ct Owl Motif Pendant (Necklace)
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）

[CaraFull] K18WG Diamond 0.2ct Pendant Top (Necklace Top)
Sold out ダイヤモンド（H&C） 4.0mm/0.234ctルース(D, VVS-1, 3Excellent H&C)

Diamond (H&C) 4.0mm/0.234ct Loose (D, VVS-1, 3Excellent H&C)

Sold out K18WG ローズカットダイヤモンド 0.27ctリング 鑑別書

【Calafuri】K18WG Rose-cut Diamond 0.27ct Ring with Certificate of Authenticity
Sold out 《Limited to 1 set》11 Stone Treated Diamond Set (approx. 1.2mm x 11 stones) 《Bulk Purchase Discount Available》

《Limited to 1 set》11 Stone Treated Diamond Set (approx. 1.2mm x 11 stones) 《Bulk Purchase Discount Available》
Sold out ダイヤモンド 0.197ctルース(K, VS-2, VeryGood)

Diamond 3.7mm/0.197ct Loose (K, VS-2, VeryGood)
Sold out Pt900/Pt850 カンボジア産ブルージルコン（ラタナキリブルー） 2.45ct ペンダント（ネックレス） 中宝ソ

Pt900/Pt850 Cambodia Blue Zircon (Ratanakiri Blue) 2.45ct/Diamond 0.26ct Pendant (with necklace) Central Gem Lab certified

Sold out K18 ペリステライト 0.66ct・ダイヤモンドペンダントトップ（ネックレストップ） 鑑別書

[22602614 Listed] [Calafli] K18 Peristerite 0.66ct Pendant Top (Necklace Top)
Sold out インターナリーフローレスダイヤモンド 0.217ctルース(D, IF, 3Excellent H&C)

[Lottery Sale 0530_02] Internally Flawless Diamond 3.8mm/0.217ct Loose Stone (D, IF, 3Excellent H&C) GIA
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）

[Calafuri] K14WG Black Diamond 0.89ct, Diamond 0.13ct Pendant Top (Necklace Top) with Appraisal Report
Sold out ダイヤモンド 0.144ctルース(I, VS1, Good)

Diamond 3.4mm/0.144ct Loose (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)

Apple Green Diamond (Treated) 3.6mm/0.183ct Loose Stone (FANCY INTENSE YELLOW GREEN TREATED, VS1)
Sold out ロシア産ダイヤモンド原石（ソーヤブル） 0.098ct原石

Rough Russian Diamonds (Sawables) 0.098ct Rough Diamonds (Trigons)
Sold out ロシア産ダイヤモンド原石（ソーヤブル） 0.117ctルース

Russian rough diamond (sawable) 0.117ct loose
Sold out ダイヤモンド 3.2mm/0.124ctルース(D, VS-2, VeryGood)

Loose diamond, 3.2mm/0.124ct (D, VS-2, Very Good)
Sold out ブラウンダイヤモンド 0.600ctルース(FANCY LIGHT BROWN, SI-2)

Brown Diamond 5.3mm/0.600ct Loose Stone (FANCY LIGHT BROWN, SI-2)

Sold out グレーダイヤモンド 0.064ctルース(LIGHT BLUISH GRAY, SI-1)

Gray Diamond 2.5mm/0.064ct Loose (LIGHT BLUISH GRAY, SI-1) Rare Stone

Sold out グレーダイヤモンド 0.039ctルース(LIGHT BLUISH GRAY, VS-1)

Gray Diamond 2.1mm/0.039ct Loose (LIGHT BLUISH GRAY, VS-1)

Sold out ピンクダイヤモンド（クッションカット） 0.157ctルース(FANCY DEEP PUPPLE PINK, I1)

Pink Diamond (Cushion Cut) 0.157ct Loose (FANCY DEEP PURPLISH PINK, I1)

Sold out 星が浮かび上がる「WISH UPON A STAR®」3.5mm/0.166ct/F/VS1 ダイヤモンド　鑑定書

[Karafuri] "WISH UPON A STAR®" 3.5mm/0.166ct/F/VS1 Diamond with Certification

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.