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7月誕生石

July birthstone

July's birthstone is Ruby Sphene .

Ruby can be said to be the representative of red gemstones. It is a gem that has been loved all over the world since ancient times. In fact, it belongs to the same mineral corundum as the striking blue sapphire. Corundum is said to be the second hardest material after diamond, and due to its durable properties, it can be enjoyed as everyday jewelry. The stronger the red and the more vivid the color, the more valuable it is, and the highest quality is called "pigeon blood."

Sphene is a gemstone that is also known for emitting dispersed light (fire) that is stronger than diamond. One of its characteristics is that it is highly pleochroic, showing different hues depending on the viewing angle. Depending on the angle of light, fire and pleochroism can appear at the same time, giving it an enchanting beauty that captivates the viewer.

Karatz GemMagazine
" List of July birthstones and birthstones "

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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
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 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
【12562858掲載】ベトナム産ルビー 1.758ctルース

1.758 ct Ruby Loose Stone from Vietnam with Identification Report Sale price¥49,800
Mozambique Ruby 0.544ct Loose Stone with Certificate of Authenticity

Mozambique Ruby 0.544ct Loose Stone with Certificate of Authenticity Sale price¥39,800
【12564632掲載】パキスタン産バナジウムスフェーン 1.579ctルース

[Item 12564632] Pakistani Vanadium Sphene 1.579ct Loose Gemstone Sale price¥69,800
[Available 10/18 at 10 PM] Ruby 0.185ct Loose Stone with Appraisal Report

[Available 10/18 at 10 PM] Ruby 0.185ct Loose Stone with Appraisal Report Sale price¥12,800
【12564633掲載】パキスタン産バナジウムスフェーン 1.690ctルース

[Available 10/14 at 22:00] Pakistani Vanadium Sphene 1.690ct Loose Gemstone with Identification Report Sale price¥69,800
K18WG ルビー0.34ct・ ダイヤモンド0.02ctリング鑑別書

[Ref: 22602726] [Colorful] K18WG Ruby & 0.02ct Diamond Ring with Appraisal Report Sale price¥98,000
非加熱ピジョンブラッドルビー 0.620ctルース AIGS

[Mon, Sep 14, 10:00 AM Deadline: Lottery Sale_09] Unheated Pigeon Blood Ruby 0.620ct Loose Stone AIGS Sale price¥148,000
合成ルビー 1.803ctルース

[Available 10/4, 10 PM] Synthetic Ruby 1.803ct Loose Gemstone Sale price¥18,800
合成ルビー 1.182ctルース

[10/4, 10:00 PM Sale] Synthetic Ruby 1.182ct Loose Stone Sale price¥12,800
非加熱ピジョンブラッドルビー 0.510ctルース

[Item 12561430] Unheated Pigeon Blood Ruby 0.510ct Loose Stone Sale price¥89,800
非加熱ピジョンブラッドルビー 0.270ctルース AIGS

[9/14 (Mon) 10:00 AM Deadline: Lottery Sale_08] Unheated Pigeon Blood Ruby 0.270ct Loose Stone AIGS Sale price¥48,800
ピジョンブラッドルビー 0.220ctルース

[Available 9/25, 10 PM] Pigeon Blood Ruby 3.6mm/0.220ct Loose Gemstone AIGS Sale price¥49,800
非加熱ピジョンブラッドルビー 0.310ctルース AIGS

[Available 9/22, 10 PM] Unheated Pigeon Blood Ruby 0.310ct Loose AIGS Sale price¥49,800
ルビー 0.176ctルース

[On sale 9/21 at 22:00] Ruby 0.176ct Loose Stone Sale price¥15,800
Madagascar sphene 0.665ct loose stone

Madagascar sphene 0.665ct loose stone Sale price¥9,800
【12564310掲載】マダガスカル産スフェーン 1.363ctルース

[Available 10/14 at 22:00] Madagascar Sphene 6.8mm/1.363ct Loose Gemstone with Appraisal Report Sale price¥19,800
ブラジル・ファナジーニョ産スフェーン 0.956ctルース 鑑別書

【Lottery Sale 0818_02】Brazilian Fanaizinho Sphene 0.956ct Loose Stone with Certificate Sale price¥19,800
Pt900 ルビー 0.71ct・ダイヤモンド 0.24ctリング鑑別書

[On Sale 9/14, 10:00 PM] [Colorifi] Pt900 Ruby 0.71ct / Diamond 0.24ct Ring with Appraisal Report Sale price¥98,000
ルビー 0.411ctルース

[Available 9/4 at 10 PM] Ruby 0.411ct Loose Stone Sale price¥18,800
ルビー 0.200ctルース

【9/4 10:00 PM Sale】Ruby 0.200ct Loose Stone Sale price¥12,800
ルビー 0.141ctルース

[Available 9/4 at 10 PM] Ruby 0.141ct loose stone Sale price¥9,800
ジンバブエ産スフェーン 0.302ctルース

【8/30 10 PM Release】Sphene from Zimbabwe 0.302ct Loose Gemstone Sale price¥8,800
ジンバブエ産スフェーン 0.332ctルース

[Available 8/30 at 10 PM] Zimbabwean Sphene 0.332ct Loose Gemstone Sale price¥9,800
非加熱ルビー 0.210ctルース

【#202607 Akihabara Pop-up Store - Currently Removed from Stock】【Listed on 12563192】Unheated Ruby 0.210ct Loose Stone Sale price¥62,800
ビルマ産ルビー 0.303ctルース

[#202607AkihabaraPop-upExhibition][12563418Posted] Burmese Ruby 0.303ct Loose Sale price¥9,800
ピジョンブラッドルビー 0.350ctルース

[On sale 9/1 at 22:00] Pigeon Blood Ruby 0.350ct Loose Stone AIGS Sale price¥49,800
ピジョンブラッドルビー 0.325ctルース

[Available 9/2, 10:00 PM] Pigeon Blood Ruby 0.325ct Loose Stone, JTL Certified Sale price¥69,800
Pt900 タイ産ルビー 1.00ct・ダイヤモンド0.40ctリング GIA

[Published 22602679] [Calafuri] Pt900 Thai Ruby 1ct Ring Sale price¥298,000
Pt900 モザンビーク産ルビー 4mm/0.3ct ・ダイヤモンド0.16ctペンダントトップ（ネックレストップ）鑑別書

[Lottery Sale 0812_05] Pt900 Mozambique Ruby 4mm/0.3ct and Diamond 0.16ct Pendant Top (Necklace Top) with Identification Report Sale price¥59,800
ルビー 0.168ctルース

[On sale August 25th, 10 PM] Ruby 0.168ct Loose Stone Sale price¥11,800
ルビー 0.268ctルース

[On sale August 25th at 10 PM] Ruby loose stone, 0.268ct Sale price¥15,800
モザンビーク産ルビー 0.409ctルース

[On sale 8/22 at 10 PM] Mozambique Ruby 0.409ct Loose Stone (Houseki Kyo) Sale price¥18,800
Pt900/K18 ルビー 0.28ct・ダイヤモンド0.20ct リング 鑑別書

【#202607 Akihabara Pop-up Store - Currently Displayed Off-site】【On Sale June 22nd at 10 PM】【Colorfully】Pt900/K18 Ruby 0.28ct, Diamond 0.20ct Ring with Appraisal Sale price¥98,000
Pt900 ルビー 0.58ct・ダイヤモンド0.59ctリング 鑑別書

[Item ID: 22602669] [Karafuri] Pt900 Ruby 0.58ct Ring Sale price¥98,000
K18 ルビー 6.74ct ・ダイヤモンド0.91ct 鑑別書

[Published 22602698] [Karafuri] K18 Ruby 6.74ct Ring Diamond 0.91ct with identification report Sale price¥228,000
ビルマ産ルビー 1.020ctルース

[Lottery Sale 0731_09] Burmese Ruby 1.020ct Loose Stone GIA Sale price¥188,000
モザンビーク産非加熱ピジョンブラッドルビー 0.430ctルース

[Lottery Sale 0725_10] Unheated Mozambique Pigeon Blood Ruby 0.430ct Loose Gemstone AIGS Sale price¥98,000
ジンバブエ産スフェーン 0.512ctルース

【Sales start: August 13, 10 PM JST】Loose Zimbabwe Sphene, 0.512 ct, with certificate Sale price¥17,800
ジンバブエ産スフェーン 0.356ctルース

[On sale August 13 at 10 PM] 0.356ct Zimbabwe Sphene Loose Stone with Certificate Sale price¥12,800
Pt900 ビルマ産ルビー 1.07ct・ダイヤモンド0.32ctリング GIA

[22602674 Listed] [Karafuri] Pt900 Burma Ruby 1.07ct Ring Sale price¥258,000
Pt900 ルビー 0.69ct・ダイヤモンド0.16ctリング 鑑別書

[Karafuru] Pt900 Ruby 0.69ct, Diamond 0.16ct Ring with Appraisal Report Sale price¥188,000
非加熱ルビー 0.216ctルース

[Published on 12563087] Unheated Ruby 0.216ct Loose Stone Sale price¥59,800
K9 ルビー・ダイヤモンドペンダントトップ（ネックレストップ） 鑑別書

[Listed as 22602651] [Colorful] K9 Ruby Pendant Top (Necklace Top) Sale price¥19,800
モザンビーク産ルビー 0.416ctルース

0.416ct Loose Mozambique Ruby with Gemstone Identification Report Sale price¥29,800

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.

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.