Round Cut

coming soon

【6/14 22時販売】ミャンマー産レッドスピネル 3.4mm/0.194ctルース Sale price¥9,800

Spanish Sphalerite 9.2mm/3.980ct loose stone Sale price¥49,800

[12552038] Beryl Cat's Eye 32.703ct Loose Stone Sale price¥98,000

[On sale June 7th at 10 PM] Madagascar Padparadscha Sapphire 3.9mm/0.282ct Loose Stone, DGL Certified Sale price¥43,800

[On sale June 7th at 10 PM] Madagascar Padparadscha Sapphire 3.9mm/0.336ct Loose Stone DGL Certified Sale price¥45,800

ピンクダイヤモンド 0.030ctルース(FANCY PURPLISH PINK, SI-1)

[On Sale 6/5 at 10 PM] Pink Diamond 1.95mm/0.030ct Loose Stone (FANCY PURPLISH PINK, SI-1) Central Gem Lab Sale price¥59,800

[On sale 6/5 at 10 PM] Russian Demantoid Garnet (horsetail inclusion visible) 5.8mm/0.876ct Loose Stone with Appraisal Report Sale price¥258,000

インターナリーフローレスダイヤモンド 0.320ctルース(G, IF, 3Excellent)

[On Sale May 31st at 10 PM] Internally Flawless Diamond 4.4mm/0.320ct Loose (G, IF, 3Excellent) GIA Sale price¥89,800

[Sale on May 30th at 10 PM] Synthetic Rutile 6.2mm/1.594ct Loose Stone Sale price¥15,800

[Published in 12563114] Madagascar Padparadscha Sapphire 0.396ct Loose Stone Sale price¥52,800

Goshenite 0.846ct loose stone Sale price¥7,980

Madagascar Yellow Sapphire 4.4mm/0.417ct Loose Sale price¥14,800

Kunzite from Afghanistan 12mm/8.834ct loose stone Sale price¥39,800

[On sale June 2 at 10 PM] Loose Diamond 3.7mm/0.197ct (H, VS-1, Good) Sale price¥29,800

[On sale June 4th at 10 PM] Diamond 3.7mm/0.194ct Loose (H, VS-2, Excellent) Sale price¥35,800

[On Sale June 4th, 10 PM JST] Diamond 3.7mm/0.190ct Loose (E, VVS-2, VeryGood) Sale price¥34,800

[Sale from 10 PM on June 4th] Diamond 3.5mm/0.145ct Loose (F, VS-1, VeryGood) Sale price¥26,800

[On sale June 1st at 10 PM] Diamond 3.1mm/0.117ct Loose (D, VVS-2, Very Good) Sale price¥23,800

[Sales begin June 6, 10 PM JST] Diamond 3.7mm/0.192ct Loose (F, VVS-2, VeryGood) Sale price¥39,800

[Sales start June 2nd, 10 PM JST] Diamond 3.7mm/0.184ct Loose Stone (D, VS-1, VeryGood) Sale price¥33,800

[On sale May 30th at 10 PM] Kenyan Tsavorite 4.1mm/0.386ct Loose Stone Sale price¥15,800

【Sale Starts May 30th at 10 PM JST】Brazilian Seafoam Tourmaline 4.1mm/0.303ct Loose Stone Sale price¥16,800

[On sale May 30th at 10 PM] Brazilian Seafoam Tourmaline 4.2mm/0.319ct Loose Stone Sale price¥17,800

[On sale May 31, 10 PM JST] Brazilian Seafoam Tourmaline 4.1mm/0.280ct Loose Sale price¥15,800

[On sale May 31st, 10 PM] Madagascar Padparadscha Sapphire 5.0mm/0.560ct Loose Stone AIGS Sale price¥89,800

Madagascar sphene 0.838ct loose stone Sale price¥9,800

Madagascar sphene 0.569ct loose stone Sale price¥6,980

ロシア産デマントイドガーネットキャッツアイ（ホーステール認む） 0.200ctルース

Russian Demantoid Garnet Cat's Eye (Horsetail Recognized) 0.200ct Loose Sale price¥18,800

Jeremejevite 0.201ct loose stone Sale price¥29,800

Brazilian Bicolor Euclase 2.4mm/0.051ct Loose Stone Sale price¥18,800

Goshenite 6.1mm/0.905ct loose stone Sale price¥7,980

Purple Spinel 4.3mm/0.323ct Loose Stone Sale price¥6,980

Violet spinel 0.301ct loose Sale price¥6,980

Pink tourmaline 6.1mm/1.031ct loose stone Sale price¥12,800

[On sale May 22nd at 10 PM] Synthetic Alexandrite 4.3mm/0.379ct Loose Stone Sale price¥9,800

[On sale May 24th, 10 PM JST] Synthetic Alexandrite 5.8mm/0.979ct Loose Stone Sale price¥22,800

[On sale May 12th at 10 PM] Tanzanian Tanzanite 4.1mm/0.295ct Loose Gemstone Sale price¥9,800

インターナリーフローレスダイヤモンド（H&C） 0.360ctルース(D, IF, 3Excellent H&C)

[On sale May 12th, 10 PM JST] Internally Flawless Diamond (H&C) 4.5mm/0.360ct Loose Stone (D, IF, 3Excellent H&C) GIA & CBT Sale price¥188,000

インターナリーフローレスダイヤモンド 0.300ctルース(F, IF, 3Excellent)

[Sale on May 12th at 10 PM] Internally Flawless Diamond 4.3mm/0.300ct Loose (F, IF, 3Excellent) GIA Sale price¥98,000

フローレスダイヤモンド（H&C） 0.230ctルース(D, FL, 3Excellent H&C)

[On sale May 12, 10 PM JST] Flawless Diamond (H&C) 4.0mm/0.230ct Loose Stone (D, FL, 3Excellent H&C) GIA&CGL Sale price¥158,000

Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan Sale price¥178,000

フローレスダイヤモンド（H&C） 0.210ctルース(D, FL, 3Excellent H&C)

[On sale May 12, 10 PM JST] Flawless Diamond (H&C) 3.8mm/0.210ct Loose (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥148,000

[Sales start May 6, 10 PM] Canadian Eudialyte 0.056ct Loose Stone with Certificate Sale price¥15,800

Mica in Quartz 0.736ct loose stone Sale price¥5,980

Mica in Quartz 0.710ct Loose Sale price¥5,980

【32501899掲載】ダイヤモンド 0.167ctルース(G, VS-1, VeryGood)

[On sale May 3 at 10 PM] Diamond 3.5mm/0.167ct Loose Stone (G, VS-1, Very Good) Sale price¥29,800

[On sale 5/27 10 PM] Diamond 3.8mm/0.197ct Loose (E, VVS-1, VeryGood) Sale price¥39,800

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.