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blue diamond

A diamond with a blue hue. There are extremely few naturally blue ones, and they are highly valued as rare items. The ones you see on the market are those whose color has been changed through irradiation treatment. Diamond is the birthstone for April.

Karatz GemMagazine
" Blue Diamond "

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[On sale from 10pm on 4/5] [Jeweler's Tools] {Only a few left} 3-piece set: Jewelry loupe (14x magnification), blue diamond, and pink tourmaline or sapphire

[On sale from 10pm on 4/5] [Jeweler's Tools] {Only a few left} 3-piece set: Jewelry loupe (14x magnification), blue diamond, and pink tourmaline or sapphire Sale price¥3,980
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
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
[On sale from 10pm on March 20th] Limited to 10 stones, 1 London Blue Diamond Loose (VS-SI class equivalent, 1.8mm) [Multiple purchase discounts available]

[On sale from 10pm on March 20th] Limited to 10 stones, 1 London Blue Diamond Loose (VS-SI class equivalent, 1.8mm) [Multiple purchase discounts available] Sale price¥1,980
[On sale from 10pm on March 16th] Limited to 9 stones, 1 London Blue Diamond loose (VS-SI class equivalent, 2.0mm) [Multiple purchase discounts available]

[On sale from 10pm on March 16th] Limited to 9 stones, 1 London Blue Diamond loose (VS-SI class equivalent, 2.0mm) [Multiple purchase discounts available] Sale price¥2,980
[On sale from 10pm on 2/24] {Limited to 7 stones} Diamond Gacha💎 Ice blue diamond (equivalent to VS-SI class, 2-2.7mm) 1 loose stone {Multiple purchase discounts available}

[On sale from 10pm on 2/24] {Limited to 7 stones} Diamond Gacha💎 Ice blue diamond (equivalent to VS-SI class, 2-2.7mm) 1 loose stone {Multiple purchase discounts available} Sale price¥4,980
[On sale at 10pm on 2/22] {Limited to 12 pieces} Diamond Gacha💎1 London Blue Diamond Loose (VS class equivalent, 2.0~3.2mm) {Multiple purchase discounts available}

[On sale at 10pm on 2/22] {Limited to 12 pieces} Diamond Gacha💎1 London Blue Diamond Loose (VS class equivalent, 2.0~3.2mm) {Multiple purchase discounts available} Sale price¥5,980
アイスブルーダイヤモンド（トリートメント） 3.2mm/0.127ctルース(LIGHT BLUE, VS2)

[On sale from 10pm on 3/28] Ice blue diamond (treated) 3.2mm/0.127ct loose (LIGHT BLUE, VS2) Sale price¥25,800
Pt900アイスブルーダイヤモンド0.333ct 0.333ct ピアス

Pt900 ice blue diamond 0.333ct/0.333ct earrings Sale price¥98,000
Pt950ベニトアイト0.10ct・アクアマリン・ブルーダイヤモンドリング - カラッツSTORE

Pt950 Benitoite 0.10ct Aquamarine Blue Diamond Ring Sale price¥98,000
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 [On sale from 10pm on 2/11] Diamond Gacha💎1 London Blue Diamond Loose (VS~SI class equivalent, taper cut or bucket cut, treated) {Multiple purchase discounts available}

[On sale from 10pm on 2/11] Diamond Gacha💎1 London Blue Diamond Loose (VS~SI class equivalent, taper cut or bucket cut, treated) {Multiple purchase discounts available}
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 [On sale from 22:00 on 2/8] 1 deep blue diamond (SI-I class equivalent, 4-4, 2mm, average 0.29ct, treated) {Multiple purchase discount}

[On sale from 22:00 on 2/8] 1 deep blue diamond (SI-I class equivalent, 4-4, 2mm, average 0.29ct, treated) {Multiple purchase discount}

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 Limited to 2 stones: London Blue Diamond (treated) 1 loose stone (VS class equivalent, including round 3mm) Multiple purchase discounts available

Limited to 2 stones: London Blue Diamond (treated) 1 loose stone (VS class equivalent, including round 3mm) Multiple purchase discounts available

Sold out Winter color gemstone 13 stone set (Santamari aquamarine, tanzanite, ice blue diamond, indigo tourmaline) half eternity ring set (2.0mm)

Winter color gemstone 13 stone set (Santamari aquamarine, tanzanite, ice blue diamond, indigo tourmaline) half eternity ring set (2.0mm)
Sold out アイスブルーダイヤモンド 0.060ctルース

Ice blue diamond 0.060ct loose
Sold out アイスブルーダイヤモンド 0.055ctルース

Ice blue diamond 0.055ct loose (VS class equivalent, heart shape)
Sold out アイスブルーダイヤモンド 0.053ctルース

Ice blue diamond 0.053ct loose (VS class equivalent, heart shape)
Sold out K18ブラジル産パライバトルマリン0.588ct ペンダント（ネックレス）

K18 Brazilian Paraiba Tourmaline 0.588ct, Blue Diamond, Paraiba Tourmaline Pendant (Necklace)
Sold out K18ブラジル産パライバトルマリン0.20ct・ブルーダイヤモンド リング

K18 Brazilian Paraiba Tourmaline 0.20ct Blue Diamond Ring
Sold out アイスブルーダイヤモンド 0.051ctルース

Ice blue diamond 0.051ct loose (equivalent to VS class)
Sold out アイスブルーダイヤモンド 0.064ctルース

Ice blue diamond 0.064ct loose (SI class equivalent)
Sold out 【カラフリ】K18WGブルーダイヤモンド（トリートメント）0.11ct ピアス - カラッツSTORE

[Colorful] K18WG blue diamond (treatment) 0.11ct earrings

Sold out K18ベニトアイト0.11ct・アイスブルーダイヤモンド・パライバトルマリンリング - カラッツSTORE

K18 Benitoite 0.11ct/Ice Blue Diamond/Paraiba Tourmaline Ring

Sold out Pt950スピネル0.23ct・ブルーダイヤモンド・ガーナイト ピンキーリング - カラッツSTORE

Pt950 spinel 0.23ct/blue diamond/garnite pinky ring

Sold out ロンドンブルーダイヤモンド（トリートメント） 2.5mm/0.070ctルース（VSクラス相当）

London Blue Diamond (Treatment) 2.5mm/0.070ct Loose (VS class equivalent)

Sold out ブルーダイヤモンド 0.070ctルース(LIGHT BLUE, SI1)

Blue diamond 0.070ct loose (LIGHT BLUE, SI1)

Sold out 【32501006掲載】ブルーダイヤモンド 0.051ctルース(LIGHT GRAYISH BLUE, SI1)

Blue diamond 0.051ct loose (LIGHT GRAYISH BLUE, SI1)

Sold out 【カラフリ】Pt900ブルーダイヤモンド0.20ct ペンダントトップ - カラッツSTORE

[Colorful] Pt900 blue diamond 0.20ct pendant top

Sold out アイスブルーダイヤモンド 1.021ctルース(FANCY INTENSE BLUE GREEN, I1) - KARATZ STORE｜カラッツSTORE

Ice blue diamond 1.021ct loose (FANCY INTENSE BLUE GREEN, I1, radiant cut)

Sold out アイスブルーダイヤモンド 3.0mm/0.090ctルース（Undetermined） GIA

Ice Blue Diamond 3.0mm/0.090ct Loose (Undetermined) GIA

Sold out K18ブラジル産パライバトルマリン0.219ct・アイスブルーダイヤモンドペンダント（ネックレス）

K18 Brazilian Paraiba Tourmaline 0.219ct Ice Blue Diamond Pendant (Necklace)
Sold out ブラジル産パライバトルマリン・サンタマリアアクアマリン・アイスブルーダイヤモンド・タンザナイト１３石ハーフエタニティリングセット（2.0mm)

Brazilian Paraiba tourmaline, Santa Maria aquamarine, ice blue diamond, and 13-stone tanzanite half eternity ring set (2.0mm)

Sold out ラボグロウンダイヤモンド（合成ダイヤモンド） 0.230ctルース(FANCY VIVID BLUE, VS-2)

Lab-grown Blue Diamond (Synthetic Blue Diamond) 0.230ct Loose (FANCY VIVID BLUE, VS-2)

Sold out ラボグロウンダイヤモンド（合成ダイヤモンド） 0.300ctルース(FANCY VIVID BLUE, VS-2)

Lab-grown Blue Diamond (Synthetic Blue Diamond) 0.300ct Loose (FANCY VIVID BLUE, VS-2)
Sold out Lab-grown Blue Diamond (Synthetic Blue Diamond) 0.380ct Loose (FANCY DEEP BLUE, VVS-2)

Lab-grown Blue Diamond (Synthetic Blue Diamond) 0.380ct Loose (FANCY DEEP BLUE, VVS-2)
Sold out K18YGサファイア0.17ct ・アイスブルーダイヤモンドリング

K18YG sapphire 0.17ct ・Ice blue diamond ring
Sold out Pt950ブルーダイヤモンド（トリートメント）0.04ct ペンダント（ネックレス）

[Colorful] Pt900 Blue Diamond (Treatment Rose Cut) 0.04ct Pendant (Necklace)
Sold out K18ベキリーブルーガーネット（カラーチェンジガーネット）0.379ct リング

K18 Madagascar Bekily Blue Garnet (Color Change Garnet) 0.379ct Blue Diamond Ring
Sold out Pt900アイスブルーダイヤモンド0.409ct ピアス - カラッツSTORE

Pt900 ice blue diamond 0.409ct earrings

Sold out アイスブルーダイヤモンド 2.6mm/0.073ctルース(FANCY INTENSE GREENISH BLUE, VS-2)

Ice blue diamond 2.6mm/0.073ct loose (FANCY INTENSE GREENISH BLUE, VS-2)

Sold out アイスブルーダイヤモンド 1.008ctルース(FANCY INTENSE GREENISH BLUE, I1)

Ice blue diamond 1.008ct loose (FANCY INTENSE GREENISH BLUE, I1, heart shape)

Sold out ブルーダイヤモンド (スターカット) 0.094ctルース(Treted FANCY INTENSE GREEN BLUE, VS1) - KARATZ STORE｜カラッツSTORE

Blue Diamond (Star Cut) 0.094ct Loose (Treted FANCY INTENSE GREEN BLUE, 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.

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