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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 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 Pink Diamond Loot Box💎 Fancy Orange Pink 0.188ct and other Fancy-colored pink diamonds (all stones sorted or certified) 《Multiple purchase discounts available》

Pink Diamond Loot Box💎 Fancy Orange Pink 0.188ct and other Fancy-colored pink diamonds (all stones sorted or certified) 《Multiple purchase discounts available》
Sold out 《Limited to 5 stones》Fluorescent brown diamond single loose stone (pear shape, SI clarity equivalent, 0.2ct UP) 《Bulk purchase discount available》

《Limited to 5 stones》Fluorescent brown diamond single loose stone (pear shape, SI clarity equivalent, 0.2ct UP) 《Bulk purchase discount 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 [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 [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 [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 [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 【On sale 10/4 at 22:00】《Limited to 6 stones》 FANCY-color pink diamond gacha, including FANCY PINK, FANCY INTENSE, FANCY DEEP, and rose-cut stones (all stones include sorting reports)《Multi-purchase discount available》

【On sale 10/4 at 22:00】《Limited to 6 stones》 FANCY-color pink diamond gacha, including FANCY PINK, FANCY INTENSE, FANCY DEEP, and rose-cut stones (all stones include sorting reports)《Multi-purchase discount available》
Sold out 【On sale 10/4 at 22:00】《Limited to 6 stones》 FANCY-color pink diamond gacha, including FANCY PINK, FANCY INTENSE, FANCY DEEP, and rose-cut stones (all stones include sorting reports)《Multi-purchase discount available》

【On sale 10/4 at 22:00】《Limited to 6 stones》 FANCY-color pink diamond gacha, including FANCY PINK, FANCY INTENSE, FANCY DEEP, and rose-cut stones (all stones include sorting reports)《Multi-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 ピンクダイヤモンド 0.055ctルース(FANCY INTENSE PURPLISH PINK, SI2)

[Deadline: Fri, 9/4, 10:00 AM: Lottery Sale_03] Pink Diamond 0.055ct Loose Stone (FANCY INTENSE PURPLISH PINK, SI-2)
Sold out インターナリーフローレスダイヤモンド 0.340ctルース(D, IF,マーキースカット) GIA

[Deadline: Sat, Oct 3, 10:00 AM: Lottery Sale ①_06] Internally Flawless Diamond 0.340ct Loose Stone (D, IF, Marquise Cut) GIA
Sold out Pt850 ダイヤモンド 1.0ct ブレスレット鑑別書

【11/5 22時販売】【カラフリ】Pt850 ダイヤモンド 1.0ct ブレスレット鑑別書
Sold out [Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》

[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》
Sold out [Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》

[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》
Sold out [Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》

[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》
Sold out [Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》

[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》
Sold out Pt900 コンクパール 0.54ct(火焔模様あり) ダイヤモンド 0.30ct ペンダント（ネックレス）鑑別書

[Item 22602836] [Carafuri] Pt900/Pt850 Conch Pearl (with flame structure) 0.54ct, Diamond 0.30ct Pendant (Necklace) with Appraisal Report
Sold out [Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》

[Available 10/12 at 10 PM] 《Limited to 1 stone》 FANCY LIGHT PINK 2.9mm/0.092ct FANCY Color Pink Diamond (Sorting report included) 《Multi-buy discount available》
Sold out K18 オーロラ天女 アコヤ真珠（アコヤパール） ダイヤモンド0.02ct ブローチ 真科研

[Item No. 22602818] [Colorfully] 18K Akoya Pearl and 0.02ct Diamond Brooch with Certificate of Authenticity
Sold out [Available 10/3 at 10 PM] 《1 Stone Only》 Pink Diamond (0.184ct, 3.5mm, I-1, Fancy Light Pink, with sorting) - Regular price 110,000 JPY 《Multi-buy discount available》

[Available 10/3 at 10 PM] 《1 Stone Only》 Pink Diamond (0.184ct, 3.5mm, I-1, Fancy Light Pink, with sorting) - Regular price 110,000 JPY 《Multi-buy discount available》

Sold out Pt950/K18 イエローダイヤモンド 0.263ct（FANCY INTENSE YELLOW） ダイヤモンド0.10ctペンダント（ネックレス）中宝鑑

[22602825] Pt950/K18 Yellow Diamond 0.263ct Diamond 0.10ct Pendant (Necklace) with Appraisal Certificate

Sold out K18 ダイヤモンド0.35ct フラワーモチーフリング鑑別書

[Item 22602768] [Color-Full] K18 0.35ct Diamond Ring with Appraisal Report

Sold out Pt900 ダイヤモンド1.00ct スリーストーンリング 鑑別書

[Available 9/30 at 10 PM] [Colori] Pt900 1.00ct Diamond Three-Stone Ring with Appraisal Report

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 【12553261掲載】ロシア産ダイヤモンド原石（ソーヤブル） 0.094ctルース

Russian diamond rough (sawable) 0.094ct rough
Sold out ピンクダイヤモンド 0.127ctルース(FANCY INTENSE PURPLE PINK, SI2)

Pink diamond 0.127ct loose stone (FANCY INTENSE PURPLE PINK, SI-2)

Sold out Pt900 特殊カットダイヤモンド 0.327ct（VS-1、Iカラー)リング 中宝

[9/15 10:00 PM Release] [Colori] 18KWG Special Cut Diamond 4.5mm/0.327ct (VS-1, I Color) Ring - CGL Certified
Sold out 【カラフリ】K18 ローズカットダイヤモンド ブレスレット

[9/9 10 PM Release] [Colori] K18 Rose-Cut Diamond Bracelet
Sold out イエローダイヤモンド 0.270ctルース(UNDER N(VERY LIGHT YELLOW), SI-2)

[On sale 8/30 at 10 PM] Yellow Diamond 4.0mm/0.270ct Loose Stone (UNDER N (VERY LIGHT YELLOW), SI-2)
Sold out ダイヤモンド 0.309ctルース(D, VVS-1, 3Excellent)

[On sale 8/30 at 22:00] Diamond 4.4mm/0.309ct loose stone (D, VVS-1, 3Excellent)
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 ピンクダイヤモンド 0.067ctルース(FANCY INTENSE PURPLE PINK, I-1)

Pink Diamond 0.067ct Loose (FANCY INTENSE PURPLE PINK, I-1)

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

Pt900 Dominican Republic Conch Pearl (with flame structure) 0.56ct and Diamond 0.25ct Ring with Identification Report

Sold out イエローダイヤモンド 0.245ctルース(FANCY INTENSE ORANGY YELLOW, SI1)

【#202607AkihabaraPop-upOutOfStock】【Shinjuku Marui Annex 202605 OutOfStock】【#202604KobeOutOfStock】【#202509ShinjukuMarui OutOfStock】Yellow Diamond 0.245ct Loose (FANCY INTENSE ORANGY YELLOW, SI1)
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

Pt950 Pink Diamond 0.058ct (FANCY INTENSE PURPLE PINK) / Diamond 0.11ct Ring with CGL Sorting

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.