Birthstone list

Diamond loose/certificate transfer fee Sale price¥6,600

January birthstone rhodolite garnet rough stone and loose stone set of 2 (from Zambia) {Multiple purchase discounts available} {For beginners} Sale price¥2,980

[On sale May 4th at 10 PM] Limited to 12 Stones - Loose Sri Lankan Star Sapphire (1 Stone) - Multiple Purchase Discount Available Sale price¥4,980

[Sale on May 4 at 10 PM JST] 12 Limited Pieces: Topaz Gacha (including Imperial Topaz) to win a Koshu Kiseki Kiriko plusthree "Akatsuki" (usually 35,800 yen) - Multiple Purchase Discount Available Sale price¥4,980

Limited to 8 stones: 1 loose Brazilian ametrine (concave cut, average 10 carats) Multiple purchase discounts available Sale price¥3,980

Tanzanite raw stone/loose 2 stone set (sugar loaf cut)《Multiple purchase discount available》 Sale price¥6,980

Limited to 25 stones: 1 unheated yogo sapphire rough stone. Discounts available for multiple purchases. Sale price¥4,980

《Limited to 21 Stones》Conch Pearl & Shell Gacha from the Dominican Republic, including Flame Pattern, 1 Stone Loose《Multi-purchase Discount Available》 Sale price¥3,980

《Limited to 13 stones, Tucson Arrivals》Kenya Bi-Color Grossular Garnet, usually ¥29,800, average 0.63ct. Tucson Arrivals 《Multiple Purchase Discount Available》 Sale price¥9,800

1 stone of green opal from South Africa (discount available for multiple purchases) Sale priceFrom ¥2,980

Single loose Russian oil-free emerald (1.6-1.7mm, princess cut) {Multiple purchase discounts available} Sale price¥9,800

Limited Edition of 12 Diamonds: VS Equivalent Fluorescent Diamond Gacha with Bonus Mini Slice Diamond (Multiple Purchase Discounts Available) Sale price¥6,980

Diamond loose sorting transition fee Sale price¥3,000

Limited to 15 stones: Mozambique aquamarine rough + 2 loose stones set. Discounts available for multiple purchases. Sale price¥2,980

[Option] Paraiba Tourmaline component analysis sorting issuance fee Sale price¥5,000

Nepalese Kyanite 1 stone loose (Royal Blue color, 4 x 6mm, oval cut) {Multiple purchase discount available} Sale price¥3,980

Limited to 20 stones: Russian Demantoid Garnet (Round Cut, 2.0mm) Loose Stone (Multiple Purchase Discounts Available) Sale price¥3,980

Limited to 14 stones: Lab-grown diamond (cabochon cut, approximately 2.3mm) - 1 loose stone. Discounts available for multiple purchases. Sale price¥4,980

Limited to 10 stones: Australian Opal Lottery with Certificate of Authenticity (including Australian Black Opal) (plus 1 Mexican Fire Opal) (Multiple purchase discounts available) Sale price¥6,980

[Sale from 10 PM on June 28] [Limited to 15 Stones] Synthetic Gem Gacha 💎 Includes a 1.02ct/D/VS1/3EX certified lab-grown diamond, normally priced at 50,000 yen (with a bonus synthetic cobalt spinel) [Bulk purchase discount available] Sale price¥5,980

Limited quantity: 1 impregnated ruby loose (4mm, round cut, identification instructions included) Multiple purchase discounts available Sale price¥1,980

Limited to 9 stones: 1 Brazilian Santa Maria aquamarine (round cut, approx. 3.2mm) Multiple purchase discounts available Sale price¥5,980

Limited to 8 stones: Mexican Hyalite Opal Loose (Large 4ct, Fluorescent even in sunlight) Multiple purchase discounts available Sale price¥4,980

Limited to 9 stones: 1 loose Australian opal (faceted cut) [Multiple purchase discounts available] Sale price¥3,980

[Sale starts May 2nd, 10 PM JST] 《Limited to 9 Stones》Rare Round Cabochon Cut Sri Lankan Star Sapphire (Approx. 5.0mm) 《Multi-item Discount Available》 Sale price¥9,800

[On sale June 19th at 10 PM] "Limited 7 Stones" Anthill Garnet Single Loose Stone (Oval Cut, approx. 4x3mm) "Multiple Purchase Discount Available" Sale price¥3,980

[Sale starts 10 PM on July 3] 《Limited to 14 stones》Fluorescent diamonds in rare colors such as white, orange, and green《Bulk purchase discount available》 Sale price¥3,980

Pyrope spessartine garnet (color change garnet) 1 stone loose (multiple purchase discount available) Sale price¥5,980

Limited to 6 stones: 1 loose, unheated silky pink sapphire from Vietnam (milky pink sapphire) Multiple purchase discounts available Sale price¥5,980

Limited to 21 stones: 1 loose Tanzanite stone from Tanzania (5 x 3 mm, oval cut) Multiple purchase discounts available Sale price¥4,980

Limited to 9 sets: Sri Lankan sapphire (3.0-3.5mm, round cut) and Sri Lankan glass body set of 2 stones. Discounts available for multiple purchases. Sale price¥5,980

Limited to 7 stones: 1 Tanzanian rhodolite garnet loose stone (polished by American polisher KEN) Multiple purchase discounts available Sale price¥3,980

Limited to 13 stones: Mexican Opal (Cabochon Cut) Gacha (Multiple purchase discounts available) Sale price¥2,980

Tucson New Arrivals / Limited to 28 Stones: Australian Andamooka Black Matrix Opal (Carbon Treated) 1 Loose Stone (Multi-purchase Discount Available) Sale price¥3,980

Kyanite from Nepal, 1 loose stone (indigo blue color, 4 x 6 mm, emerald cut) {Multiple purchase discount available} Sale price¥2,980

Top Quality: Benitoite 7 Stones and Diamond 6 Stones (H&C) Half Eternity Ring Set (2.0mm) Sale price¥178,000

November birthstone citrine rough and loose stone set of 2 (Madeira citrine, from Brazil) {Multiple purchase discounts available} {For beginners} Sale price¥3,980

Limited to 4 sets: Sri Lankan sapphire (2.5mm, round cut) and Sri Lankan glass body set of 2 stones. Discounts available for multiple purchases. Sale price¥3,980

Limited to 10 stones: 1 unheated yogo sapphire rough stone. Discounts available for multiple purchases. Sale price¥5,980

Limited to 8 stones: 1 loose kite cut stone (illusion sunstone, sapphire, emerald, spessartine garnet, etc.) Multiple purchase discounts available Sale price¥5,980

Limited to 14 stones: 3mm single unheated sapphire from the Theppanawa mine in Sri Lanka. Discounts available for multiple purchases. Sale price¥5,980

Limited to 11 stones: Sakura-shaped Contralus Opal and a specially cut Opal Gacha with one loose stone. Discounts available for multiple purchases. Sale price¥3,980

Limited to 12 stones: Mexican opal (custom faceted cut) - 1 loose stone (multiple purchase discounts available) Sale price¥3,980

Gem Gacha💎Heart-shaped tourmaline 1 stone💎4mm《Multiple purchase discount available》 Sale price¥2,980

[On sale July 26th, 10 PM JST] Limited to 10 Stones! Diamond Gacha 💎 Win a diamond with a Central Japan Gem Lab sorting report (0.136ct/E/VVS-2/EXCELLENT/NONE (Hearts & Arrows))! Multiple Purchase Discount Available Sale price¥3,980

Limited to 18 Stones: 3mm Rhodolite Garnet from Sri Lanka, 1 stone loose. Discounts for multiple purchases. Sale price¥2,980

《New Tucson Arrivals - Limited to 13 Stones》Mexican Opal, including B-grade stones (Egg-in-Opal and Water Opal) 《Multiple Purchase Discount Available》 Sale price¥2,980

New Arrival in Tucson - Limited to 5 Stones - Brazilian Limonite Topaz, Average 2.8cts (Multiple Purchase Discounts Available) Sale price¥2,980

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.