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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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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

[Resale] [Jeweler's Tools] H&C (Heart & Cupid) Scope (Diamond 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
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} Sale price¥5,580
H&C(ハート&キューピッド)ダイヤモンド2mmルース - カラッツSTORE

H&C (Hearts & Cupids) 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》1 stone loose《Multiple purchase discount available》

Lab-grown diamond (synthetic diamond)《HPHT method》1 stone loose《Multiple purchase discount available》 Sale priceFrom ¥2,980
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
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)

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 1.2mm Loose (VS Class, DG Class, Melee Diamonds) {Multiple Purchase Discounts Available} Sale price¥3,980
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
Sold out トラピッチェダイヤモンド（一部蛍光グリーン）

1 Trapiche diamond (some fluorescent green)

Sold out Diamond gacha 💎Diamond gacha (treatment) where you can win a 12 stone set of color rings, ice blue diamonds, and purple diamonds (discount for multiple purchases available) [3,980 yen]

Diamond gacha 💎Diamond gacha (treatment) where you can win a 12 stone set of color rings, ice blue diamonds, and purple diamonds (discount for multiple purchases available) [3,980 yen]

Sold out Diamond gacha💎Diamond gacha (treatment) where you can win purple diamonds and ice blue diamonds (multiple purchase discount available)

Diamond gacha💎Diamond gacha (treatment) where you can win purple diamonds and ice blue diamonds (multiple purchase discount available)

Sold out Gem Gacha💎Rose cut diamond (fluorescent orange, green, yellow)

Gem Gacha💎Rose cut diamond (fluorescent orange, green, yellow)

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}

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
Sold out Gem Gacha💎Diamond (with fluorescence)💎(Maximum 0.265ct)

Gem Gacha💎Diamond (with fluorescence)💎(Maximum 0.265ct)

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} Sale price¥1,580
1 blue fluorescent diamond (VS-SI class equivalent, 2.0mm)《Multiple purchase discount available》

1 blue fluorescent diamond (VS-SI class equivalent, 2.0mm)《Multiple purchase discount available》 Sale price¥5,980
Sold out Gem Gacha "April Birthstone"💎 Fluorescent Diamond (VS-SI class equivalent, treated, 3.75mm apple green color included) 1 stone {Multiple purchase discount available}

Gem Gacha "April Birthstone"💎 Fluorescent Diamond (VS-SI class equivalent, treated, 3.75mm apple green color included) 1 stone {Multiple purchase discount available}

Sold out ジェムガチャ『4月誕生石』💎ローズカットの蛍光ダイヤモンド1石《複数購入割引有》

Gem Gacha "April Birthstone"💎1 rose-cut fluorescent diamond

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)

Gem Gacha "April Birthstone" 💎 Fluorescent Yellow Diamond (Tapered Cut or Baguette Cut) 1 Stone {Multiple Purchase Discounts Available}

Gem Gacha "April Birthstone" 💎 Fluorescent Yellow Diamond (Tapered Cut or Baguette Cut) 1 Stone {Multiple Purchase Discounts Available} Sale price¥3,980
Sold out Limited to 10 stones: Blue diamond rough and loose stone set of 2 (treated) Multiple purchase discount

Limited to 10 stones: Blue diamond rough and loose stone set of 2 (treated) Multiple purchase discount
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)
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》 Sale price¥8,800
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
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 [With translation] Pink diamond (0.12ctUP, 3.0mm-3.5mm, round cut) 1 stone loose

[With translation] Pink diamond (0.12ctUP, 3.0mm-3.5mm, round cut) 1 stone loose

Sold out Diamond Gacha💎1 pink diamond [all Fancy Purple Pink] (all items sorted)💎《Multiple purchase discount available》

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

Sold out Diamond gacha💎Fancy cut brown diamonds and FancyDarkBrown diamonds (with medium treasure chest)《Multiple purchase discount available》

Diamond gacha💎Fancy cut brown diamonds and FancyDarkBrown diamonds (with medium treasure chest)《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 Gem Gacha "April Birthstone" 💎 Trapiche Diamond (Slice Diamond) 1 Stone

Gem Gacha "April Birthstone" 💎 Trapiche Diamond (Slice Diamond) 1 Stone

Sold out Gem Gacha 3,980 yen💎1 diamond《Rose cut》(Fancy yellow, etc., 2.3mm-3.3mm)

Gem Gacha 3,980 yen💎1 diamond《Rose cut》(Fancy yellow, etc., 2.3mm-3.3mm)

Sold out Gem Gacha💎Special cut diamond (VS-SI class equivalent)

Gem Gacha💎Special cut diamond (VS-SI class equivalent)

Sold out 1 sawable diamond (average 0.13ct)

1 sawable diamond (average 0.13ct)

Sold out Diamond Gacha💎Diamond rough (including sawable and makeable diamonds, one in two people will receive an additional 1.6-1.7mm VS-SI class diamond) {Multiple purchase discount available}

Diamond Gacha💎Diamond rough (including sawable and makeable diamonds, one in two people will receive an additional 1.6-1.7mm VS-SI class diamond) {Multiple purchase discount available}

Sold out ライトミントグリーンダイヤモンド1石ルース（2.0mm,VS-SI）《複数購入割引有》

1 light mint green diamond loose (2.0mm, VS-SI)《Multiple purchase discount available》

Sold out 《8石限定》ジェムガチャ『4月誕生石』💎ミントダイヤモンド1石💎（トリートメント）（VSクラス相当） - カラッツSTORE

《8 stones limited》Gem gacha 『April birthstone』💎1 mint diamond💎(treated)(VS class equivalent)

Sold out Gem Gacha💎 Ice Blue Diamond, Moss Green Diamond, London Blue Diamond, etc. (1.8-4.2mm, Treated)

Gem Gacha💎 Ice Blue Diamond, Moss Green Diamond, London Blue Diamond, etc. (1.8-4.2mm, Treated)

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 Black diamond 3.0mm loose (rose cut)《April birthstone》 1 stone

Black diamond 3.0mm loose (rose cut)《April birthstone》 1 stone

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
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 「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

Diamond loose sorting transition fee

Diamond loose sorting transition fee Sale price¥3,000
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 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 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》

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