
















Brown diamond (sugarloaf cut) 0.278ct loose (SI class equivalent)
Among the many gemstones, diamonds are a special stone. Since ancient times, a wide variety of cuts have been devised to enhance the beauty of this stone, the hardest gemstone on earth, and its brilliance has continued to fascinate people all over the world. Many famous diamond jewelry pieces that have appeared throughout history entertain us with various anecdotes and legends.
If you have fluorescent photos, they were taken in a darkroom with a strong black light. If you want to view the fluorescence at home, you can enjoy the beautiful fluorescence by darkening the room or covering the gemstone with the palm of your hand.
This is a brown diamond with high transparency equivalent to SI class. It is a sugar loaf cut, which is rare for brown diamonds.
Type: Loose (natural stone)
・Stone name: Diamond (cabochon cut) ( Diamond )
Weight: 0.278ct
・Size: 3.7 x 3.4 mm
Shape: Custom cut
・Scratches/chips: S
Inclusions: S
·remarks:---
・Accessories: Caratz quality guarantee, loose case (if it does not fit, a clear zip case)
▷We accept jewelry processing.If you would like to have your jewelry processed, please order along with the frame of your choice from the link below.
・[Select by stone] Simple order
・[Select from stones] Semi-custom
*If you would like an image of the stone in the frame, would like to discuss a full order, or have any other concerns or questions, please feel free to contact us here .
*Raw stones are not available. There are also some stones that cannot be handled.
*We try to make the colors in the photos as close as possible to the actual product, but they may look slightly different from the actual product depending on the lighting conditions at the time of shooting and the monitor environment you are using. Also, some photos may have been taken using a penlight.
*For information on scratches, chips, treatments, and inclusions, please click here .
*For other frequently asked questions, please click here .
karatz_item_id: 12556289
Choose options






![[On sale 8/12, 10 PM] "Limited to 10 stones" Strong Fire Gem Gacha featuring 3mm Benitoite and Blue Zircon, normally 42,800 yen (multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/collage_278d67ff-f62b-4a8b-9e44-16602ef86502.png?v=1786093945&width=2000)
![[On sale August 12th at 10 PM] "Limited to 15 Stones" Diamond Gacha featuring rare butterfly-cut diamonds "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/2026-08-0717.06.55.png?v=1786090036&width=1279)
![[12564014 listed] Madagascar Royal Blue Sapphire 0.559ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7313635_14e21f9a-c659-4e26-98cc-121a6a6526df.jpg?v=1786405650&width=3004)
![[Listed as 12563592] Red Coral 0.908ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P1010942_0ddc060b-5571-4bb3-82db-903a0f6846f0.jpg?v=1784777741&width=4000)
![[Published as 12564055] American Red Beryl 0.239ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P8061727_7397d8ee-50f1-4d18-895f-81834f48bc37.jpg?v=1786405834&width=3165)
![[Published as 12564054] Kochi Prefecture Coral 8.132ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P8061786_dbfd5e49-ee7b-485a-84a1-e71f7aec96c4.jpg?v=1786406143&width=3463)

![[Posted on 12563959] Madagascar Padparadscha Sapphire 0.164ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7241965_cec751e0-3766-4ff6-a740-715fc57f7e8e.jpg?v=1786398430&width=2936)
![[12563912 listed] Colombian Pyrite and Mica in Emerald 0.500ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7290484.jpg?v=1785318021&width=4000)



![[#202607 Akihabara Pop-up Store - Currently out on loan] [Listed as 12563392] Tanzanian Red Spinel 0.291ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P6258339_9ab76656-a3f6-484b-99d4-5a2c0a9869bd.jpg?v=1786348136&width=3175)












![[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones](http://store.karatz.jp/cdn/shop/files/P4130575.jpg?v=1776126091&width=4000)