Ruby

Ruby is the birthstone of July. It is a type of corundum, the same mineral as sapphire, and is a red gemstone. It is also said to be the representative of red gemstones, and has a long history of being cherished all over the world since ancient times. With a hardness of 9, it is the second hardest after diamond and is highly durable, making it a gemstone that can be enjoyed on a daily basis as jewelry.

Karatz GemMagazine
" Ruby "

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ルビー 0.302ctルース

【2/25 22時販売】ルビー 0.302ctルース Sale price¥9,800
[Resale] [Jeweler's Tools] Black Light, 3 Loose Stones (Ruby, Red Spinel, Oil in Quartz) with Rechargeable Battery

[Resale] [Jeweler's Tools] Black Light, 3 Loose Stones (Ruby, Red Spinel, Oil in Quartz) with Rechargeable Battery Sale price¥6,980
1 Ruby from Greenland (round cut, 1.2mm)《Discount available for multiple purchases》

1 Ruby from Greenland (round cut, 1.2mm)《Discount available for multiple purchases》 Sale price¥2,280
グリーンランド産ルビー 1石（ハートシェイプ,4mm）

1 Ruby from Greenland (heart shape, 4mm)《Discount available for multiple purchases》 Sale price¥5,980
Limited to 8 stones: 1 unheated silky pink sapphire from Vietnam (including silky ruby) Discounts for multiple purchases available

Limited to 8 stones: 1 unheated silky pink sapphire from Vietnam (including silky ruby) Discounts for multiple purchases available Sale price¥4,980
Limited to 18 stones: Mozambique ruby ​​(princess cut, 2.3-2.5mm) Multiple purchase discounts available

Limited to 18 stones: Mozambique ruby ​​(princess cut, 2.3-2.5mm) Multiple purchase discounts available Sale price¥3,980
Limited to 5 sets: Natural ruby ​​& synthetic ruby ​​2 stone set (heart shape, sorting included) Multiple purchase discounts available

Limited to 5 sets: Natural ruby ​​& synthetic ruby ​​2 stone set (heart shape, sorting included) Multiple purchase discounts available Sale price¥5,980
ビルマ産非加熱スタールビー 1.050ctルース

[On sale at 22:00 on 2/10] Burmese unheated star ruby ​​1.050ct loose Sale price¥29,800
ルビー 0.305ctルース

[On sale 2/8 at 10pm] Ruby 4.0mm/0.305ct loose stone Sale price¥45,800
ルビー 0.301ctルース

[On sale from 22:00 on 2/8] Ruby 4.0mm/0.301ct loose stone Sale price¥45,800
ルビー 0.111ctルース

Ruby 0.111ct loose stone Sale price¥8,800
ピジョンブラッドルビー 0.550ctルース

Pigeon Blood Ruby 0.550ct Loose AIGS Sale price¥59,800
K18YG ミャンマー産ルビー ペンダント（ネックレス）

K18YG Myanmar Ruby, Padparadscha Color Sapphire, Yellow Diamond Pendant (Necklace) Sale price¥98,000
ルビー 0.337ctルース

Ruby 0.337ct loose stone Sale price¥8,800
ルビー 0.662ctルース

Ruby 0.662ct loose stone Sale price¥15,800
ルビー 0.739ctルース

Ruby 0.739ct loose Sale price¥12,800
ビルマ産ルビー 0.256ctルース

Burmese Ruby 0.256ct Loose Sale price¥12,800
ルビー 0.396ctルース

Pigeon Blood Ruby 0.400ct Loose AIGS Sale price¥55,800
モザンビーク産非加熱ルビー 0.231ctルース

Unheated Mozambique Ruby 0.231ct Loose Sale price¥25,800
モザンビーク産非加熱ルビー 0.220ctルース

Unheated Mozambique Ruby 0.220ct Loose Sale price¥25,800
非加熱ルビー 0.330ルース

Unheated Ruby 0.330ct Loose AIGS Sale price¥35,800
ルビー 0.280ルース

Pigeon Blood Ruby 0.280ct Loose AIGS Sale price¥45,800
ビルマ産ルビー 0.418ルース

Burmese Ruby 0.418ct Loose Stone Japan-Germany Sale price¥35,800
ビルマ産非加熱ルビー 0.245ルース

Burmese unheated ruby ​​0.245ct loose stone by Nikkei Sale price¥39,800
ビルマ産ルビー 0.239ルース

Burmese Ruby 0.239ct Loose Sale price¥9,800
Limited quantity: 1 impregnated ruby ​​loose (4mm, round cut, identification instructions included) Multiple purchase discounts available

Limited quantity: 1 impregnated ruby ​​loose (4mm, round cut, identification instructions included) Multiple purchase discounts available Sale price¥1,980
パキスタン産ルビーインクォーツ 1.429ctルース

Pakistan Ruby in Quartz 1.429ct Loose Stone Sale price¥12,800
ルビー 0.284ctルース

Ruby 0.284ct loose Sale price¥15,800
Ruby 0.245ct loose

Ruby 0.245ct loose Sale price¥11,800
Ruby 0.254ct loose stone

Ruby 0.254ct loose stone Sale price¥8,800
ルビー 0.273ctルース

Ruby 0.273ct loose stone Sale price¥13,800
ルビー 0.173ctルース

Ruby 0.173ct loose stone Sale price¥12,800
[E_26 Yurakucho Marui Take-out] K18YG Unheated Padparadscha Sapphire 0.61ct, Ruby, Blue Sapphire Ring GIA

[E_26 Yurakucho Marui Take-out] K18YG Unheated Padparadscha Sapphire 0.61ct, Ruby, Blue Sapphire Ring GIA Sale price¥198,000
ミャンマー産トラピッチェルビー 0.125ctルース

Myanmar Trapiche Ruby 2.6mm/0.125ct Loose Stone Sale price¥5,980
Pigeon Blood Ruby 0.44ct Ruby AIGS

Pigeon Blood Ruby 0.44ct Ruby AIGS Sale price¥55,800
Pigeon Blood Ruby 0.40ct Loose AIGS

Pigeon Blood Ruby 0.40ct Loose AIGS Sale price¥49,800
ピジョンブラッドルビー 0.40ctルース AIGS

Pigeon Blood Ruby 0.40ct Loose AIGS Sale price¥59,800
ルビー 0.244ctルース

Mozambique Ruby 0.244ct Loose Sale price¥9,800
ルビー 0.483ctルース

Mozambique Ruby 0.483ct Loose Sale price¥15,800
ルビー 0.226ctルース

Mozambique Ruby 0.226ct Loose Sale price¥8,800
ルビー 0.110ctルース

Ruby 0.110ct loose Sale price¥9,800
ルビー 0.441ctルース

Pigeon Blood Ruby 0.441ct Loose Sale price¥69,800
Ruby 0.289ct loose stone by Takakikyo

Ruby 0.289ct loose stone by Takakikyo Sale price¥12,800
ルビー 0.178ctルース

Ruby 0.178ct loose stone with precious stone Sale price¥8,800
ミャンマー産トラピッチェルビー 0.250ctルース

Myanmar Trapiche Ruby 0.250ct Loose Sale price¥15,800
ミャンマー産トラピッチェルビー 0.342ctルース

Myanmar Trapiche Ruby 0.342ct Loose Sale price¥15,800
ミャンマー産トラピッチェルビー 0.216ctルース

Myanmar trapichel ruby ​​0.216ct loose Sale price¥15,800
ルビー 0.106ctルース

Ruby 0.106ct loose Sale price¥12,800

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