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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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 loose sphene stone from Madagascar (3mm, princess cut) Multiple purchase discounts available

Limited to 8 stones: 1 loose sphene stone from Madagascar (3mm, princess cut) Multiple purchase discounts available Sale price¥2,980
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
[On sale from 10pm on 2/16] [Limited to 16 stones] 1 loose sphene stone from Zimbabwe [Multiple purchase discounts available]

[On sale from 10pm on 2/16] [Limited to 16 stones] 1 loose sphene stone from Zimbabwe [Multiple purchase discounts available] Sale price¥2,980
Limited to 7 stones: 1 loose sphene stone from Madagascar (2mm, princess cut) Multiple purchase discounts available

Limited to 7 stones: 1 loose sphene stone from Madagascar (2mm, princess cut) Multiple purchase discounts available Sale price¥1,980
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
{Only one left} Madagascar sphene loose stone {Multiple purchase discounts available}

{Only one left} Madagascar sphene loose stone {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
マダガスカル産スフェーン 1.751ctルース

[On sale 2/8 at 10pm] Madagascar sphene 1.751ct loose stone Sale price¥19,800
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
マダガスカル産スフェーン 1.003ctルース

[On sale 2/7 at 10pm] Madagascar sphene 1.003ct loose stone Sale price¥35,800
マダガスカル産スフェーン 0.790ctルース

[On sale 2/4 at 10pm] Madagascar sphene 0.790ct loose stone Sale price¥9,800
マダガスカル産スフェーン 0.430ctルース

[On sale 2/4 at 10pm] Madagascar sphene 0.430ct loose stone Sale price¥8,800
マダガスカル産スフェーン 1.643ctルース

[On sale 2/4 at 10pm] Madagascar sphene 1.643ct loose stone Sale price¥18,800
マダガスカル産スフェーン 1.060ctルース

[On sale 2/4 at 10pm] Madagascar sphene 1.060ct loose stone Sale price¥12,800
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
マダガスカル産スフェーン 1.002ctルース

Madagascar sphene 1.002ct loose stone Sale price¥15,800
スフェーン 0.991ctルース

Madagascar sphene 0.991ct loose stone Sale price¥12,800
スフェーン 1.080ctルース

Madagascar sphene 1.080ct loose stone 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
スフェーン 0.906ルース

Madagascar Sphene 6.2mm/0.906ct Loose Stone Sale price¥12,800
スフェーン 1.386ルース

Madagascar sphene 1.386ct loose stone Sale price¥12,800
スフェーン 0.673ルース

Madagascar sphene 0.673ct loose stone Sale price¥15,800
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

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