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alexandrite

Alexandrite is known as one of the birthstones for June. Its main feature is its color-change effect, which means that its color changes depending on the light source. It was once mined in large quantities in Russia, but today its main production area is said to be Brazil. Since it is difficult to find large stones, the larger they are and the more obvious their color-change effect is, the more valuable they are.


Carats Gem Magazine
" alexandrite "

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合成アレキサンドライト 0.827ctルース

Synthetic Alexandrite 5.7mm/0.827ct Loose Stone Sale price¥19,800
合成アレキサンドライト 0.560ctルース

Synthetic Alexandrite 0.560ct loose stone Sale price¥14,800
合成アレキサンドライト 0.570ctルース

Synthetic Alexandrite 0.570ct loose stone Sale price¥18,800
ブラジル産アレキサンドライト 0.091ctルース

Brazilian Alexandrite 0.091ct loose stone (princess cut) Sale price¥22,800
ブラジル産アレキサンドライト 0.054ctルース

Brazilian Alexandrite 0.054ct Loose (Emerald Cut) Sale price¥18,800
ブラジル産アレキサンドライト 0.079ctルース（エメラルドカット）

[12558729] Brazilian Alexandrite 0.079ct loose stone Sale price¥31,800
ブラジル産アレキサンドライト 0.078ctルース

Brazilian alexandrite 0.078ct loose Sale price¥29,800
ブラジル産アレキサンドライト 0.071ctルース

Brazilian Alexandrite 0.071ct Loose (Emerald Cut) Sale price¥29,800
ブラジル産アレキサンドライト 0.066ctルース

Brazilian Alexandrite 0.066ct loose stone (emerald cut) Sale price¥22,800
ブラジル産アレキサンドライト 0.135ctルース

Brazilian Alexandrite 0.135ct loose stone Sale price¥35,800
アレキサンドライト 0.201ctルース

Alexandrite 0.201ct loose stone Sale price¥39,800
ブラジル産アレキサンドライト 0.073ctルース（プリンセスカット）

Brazilian Alexandrite 0.073ct loose stone (princess cut) Sale price¥16,800
ブラジル産アレキサンドライト 0.089ctルース（プリンセスカット）

Brazilian Alexandrite 0.089ct Loose (Princess Cut) Sale price¥19,800
合成アレキサンドライト 0.330ctルース

Synthetic Alexandrite 0.330ct loose stone Sale price¥9,800
合成アレキサンドライト 0.502ctルース

Synthetic Alexandrite 0.502ct loose stone Sale price¥15,800
合成アレキサンドライト 0.282ctルース

Synthetic Alexandrite 0.282ct loose stone Sale price¥9,800
ブラジル産アレキサンドライトキャッツアイ 0.219ctルース

Brazilian Alexandrite Cat's Eye 3.3mm/0.219ct Loose Stone (Hemachita Mine) Sale price¥32,800

Additional charge: K18WG (base metal) + 10,000 yen Sale price¥12,800
K18YG南洋真珠10.616ct・ベキリーブルーガーネット・アレキサンドライト・ダイヤモンドリング

K18YG South Sea pearl 10.616ct, Bekiri blue garnet, alexandrite and diamond ring Sale price¥198,000
ブラジル産アレキサンドライト 0.069ctルース（プリンセスカット）

Brazilian Alexandrite 0.069ct loose stone (princess cut) Sale price¥17,800
ブラジル産アレキサンドライト 0.072ctルース（プリンセスカット）

Brazilian Alexandrite 0.072ct loose stone (princess cut) Sale price¥18,800
Sold out Top Quality: Brazilian Alexandrite 1 Stone Loose (2.0mm, Hematita Mine) Multiple Purchase Discounts Available

Top Quality: Brazilian Alexandrite 1 Stone Loose (2.0mm, Hematita Mine) Multiple Purchase Discounts Available
Sold out ブラジル産アレキサンドライト・ムーンストーン2石セット（6月誕生石セット）《複数購入割引有》

《Limited to 32 stones》 Brazilian Alexandrite Moonstone 2 stone set (June birthstone set)《Multiple purchase discount available》
Sold out Synthetic alexandrite 1 stone (round, mele size)《Discount available for multiple purchases》

Synthetic alexandrite 1 stone (round, mele size)《Discount available for multiple purchases》

Sold out [6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》

[6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》
Sold out 《Limited to 12 stones》Russian alexandrite and alexandrite from different origins (normally 69,800 yen) + free Sri Lankan chrysoberyl crystal《Multiple purchase discount available》

《Limited to 12 stones》Russian alexandrite and alexandrite from different origins (normally 69,800 yen) + free Sri Lankan chrysoberyl crystal《Multiple purchase discount available》
Sold out Top Quality: Brazilian Alexandrite 1 Stone Loose (2.2mm, Hematita Mine) Multiple Purchase Discounts Available

Top Quality: Brazilian Alexandrite 1 Stone Loose (2.2mm, Hematita Mine) Multiple Purchase Discounts Available
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 Color-change gacha featuring one gemstone, including Myanmar color-change zircon, alexandrite, and Bekily blue garnet, usually priced at 39,800 yen (multi-purchase discounts available)

Color-change gacha featuring one gemstone, including Myanmar color-change zircon, alexandrite, and Bekily blue garnet, usually priced at 39,800 yen (multi-purchase discounts available)
Sold out [Sales begin August 16, 10 PM] Limited to 11 Stones: Alexandrite Gacha with Russian Alexandrite and Brazilian Silky Color (usually ¥69,800), includes 1 bonus Alexandrite. [Multiple purchase discount available]

[Sales begin August 16, 10 PM] Limited to 11 Stones: Alexandrite Gacha with Russian Alexandrite and Brazilian Silky Color (usually ¥69,800), includes 1 bonus Alexandrite. [Multiple purchase discount available]
Sold out Color Change Gacha💎 Russian alexandrite, Brazilian alexandrite, and Tanzanian color-change garnets, usually priced at ¥39,800. 《Discounts for multiple purchases available》

Color Change Gacha💎 Russian alexandrite, Brazilian alexandrite, and Tanzanian color-change garnets, usually priced at ¥39,800. 《Discounts for multiple purchases available》
Sold out [Available Oct 5, 10 PM] 《Limited Quantity・October Campaign Commemorative》 Rare Stone Gacha💎 8 varieties including 0.5ct Phosphophyllite, 0.2ct Benitoite, and Alexandrite, all with certificates of authenticity《Multi-purchase discounts available》

[Available Oct 5, 10 PM] 《Limited Quantity・October Campaign Commemorative》 Rare Stone Gacha💎 8 varieties including 0.5ct Phosphophyllite, 0.2ct Benitoite, and Alexandrite, all with certificates of authenticity《Multi-purchase discounts available》
Sold out Limited 5 Stones: Synthetic Alexandrite Gacha (Princess Cut, 3.5-4.5mm) (Multi-Buy Discount Available)

Limited 5 Stones: Synthetic Alexandrite Gacha (Princess Cut, 3.5-4.5mm) (Multi-Buy Discount Available)
Sold out Brazilian alexandrite (average 0.12ct) loose (multiple purchase discount available)

Brazilian alexandrite (average 0.12ct) loose (multiple purchase discount available)

Sold out 《Limited to 10 stones》Color change gemstone gacha: color change zircon, alexandrite, color change garnet, etc. 《Multi-purchase discount available》

《Limited to 10 stones》Color change gemstone gacha: color change zircon, alexandrite, color change garnet, etc. 《Multi-purchase discount available》
Sold out 1 Russian Alexandrite loose stone (round cut, 1.3-1.6mm) {Multiple purchase discount available}

1 Russian Alexandrite loose stone (round cut, 1.3-1.6mm) {Multiple purchase discount available}
Sold out Limited to 4 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.3mm/average 0.13ct) Multiple purchase discounts available

Limited to 4 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.3mm/average 0.13ct) Multiple purchase discounts available

Sold out ブラジル産アレキサンドライト 0.148ctルース

[Deadline: Tue, Oct 13, 10:00 AM: Lottery Sale_08] Brazilian Alexandrite 0.148ct Loose Gemstone GIA

Sold out ブラジル産アレキサンドライト 0.210ctルース

[10/21 (Wed) 10:00 AM Deadline: Lottery Sale] Brazilian Alexandrite 0.210ct Loose Stone GIA

Sold out インド産アレキサンドライト 0.160ctルース

[Deadline: Wed, Oct 21, 10:00 AM: Lottery Sale] Indian Alexandrite 0.160ct Loose Stone GIA

Sold out Pt900 ブラジル産アレキサンドライト 0.15 0.14ct ダイヤモンド0.14 0.12ctピアス鑑別書

[Item 22602845] Pt900 Brazilian Alexandrite 0.15/0.14ct & Diamond 0.14/0.12ct Earrings with Appraisal Report

Sold out ロシア産アレキサンドライトキャッツアイ 0.363ctルース

[Item No. 12564572] Russian Alexandrite Cat's Eye 0.363ct Loose Stone

Sold out Pt950 ブラジル産アレキサンドライト（プリンセスカット） 0.09ct ダイヤモンド0.044ctリング

Pt950 Brazilian Alexandrite (Princess Cut) 0.09ct and Diamond 0.044ct Ring

Sold out Pt950 ブラジル産アレキサンドライト（ペアシェイプカット） 0.165ct ダイヤモンド0.060ctリング

Pt950 Brazilian Alexandrite (Pear-Shaped Cut) 0.165ct and Diamond 0.060ct Ring

Sold out Pt900 アレキサンドライト0.15ct・ダイヤモンド0.08ctペンダントトップ（ネックレストップ）鑑別書

[Listing 22602762] [Colorify] Pt900 Alexandrite 0.15ct, Diamond 0.08ct Pendant Top (Necklace Top) with Appraisal Report

Sold out K18WG ブラジル産アレキサンドライト 0.3ct ダイヤモンド0.15ctペンダントトップ（ネックレストップ）GIA

[Item 22602816] [Colorify] 18K White Gold Brazilian Alexandrite 0.3ct and Diamond 0.15ct Pendant Top (Necklace Top) with Identification Report
Sold out K18WG クレサンベール 合成アレキサンドライト3.00ct プリンセスカット・ダイヤモンド0.12ct ペンダントトップ 鑑別書

[Item No. 22602776] [Colorify] K18WG Synthetic Alexandrite 3ct, Diamond 0.12ct Pendant Top (Necklace Top) with Appraisal Report
Sold out ブラジル産アレキサンドライト 0.300ctルース

Brazilian Alexandrite 0.300ct Loose Stone GIA

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.