Maison Gem Time · Since 1915 · Complimentary insured U.S. shipping · 60-day returns · Lifetime care
GT Gem TimeSince 1915

Maison Gem Time · 宝时 · Since 1915

A century of fine diamonds, hand-finished for the everyday.

Four generations of jewelers, working in certified diamonds and the quiet precision of platinum and 18K white gold — for engagements, anniversaries, and the pieces you reach for first.

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signature diamond piece editorial image
three generations at the family table — editorial portrait

The Maison · Est. 1915

From a quiet atelier to four generations of jewelers.

Founded in 1915 in Shanghai's foreign concession and re-rooted in New York after the war, Gem Time has spent a century setting certified diamonds in platinum and 18K white gold. Every piece is cut, set, and signed by a single master before it leaves the workshop.

  • 1915Atelier opens, Shanghai
  • 1958Maison relocates to Madison Avenue
  • 1987First in-house diamond grading lab
  • 2024Direct-to-client house relaunches
IGI / GIACertified diamonds
Since 1915Four generations
ComplimentaryInsured shipping
LifetimeCare warranty

The collection

Editorial categories.

engagement rings editorial image Engagement Rings diamond rings editorial image Diamond Rings necklaces & pendants editorial image Necklaces & Pendants diamond earrings editorial image Diamond Earrings diamond bracelets editorial image Diamond Bracelets diamond watches editorial image Diamond Watches wedding bands editorial image Wedding Bands diamond pavé editorial image Diamond Pavé halo edit editorial image Halo Edit statement pieces editorial image Statement Pieces diamond studs editorial image Diamond Studs high jewelry looks editorial image High Jewelry Looks

Notes from the atelier

Cut, set, considered.

editorial portrait — woman in cream cashmere with diamond tennis necklace
Everyday brilliance

Studs, halo solitaires, an heirloom you can wear to dinner.

black and white editorial portrait — pavé diamond hoop earrings
Studio sittings

Pavé hoops and diamond drops, in Peter Lindbergh light.

editorial portrait — woman laughing in candlelight, diamond drops
The dinner hour

Diamond drops worn to long evenings and longer conversations.

editorial portrait — gentleman in charcoal suit with platinum watch
The gentleman's edit

Platinum dress watches and signets, quietly worn for decades.

Build your ring

Choose the setting. Select the diamond. See the value.

A guided buying flow with transparent pricing on every certified stone.

hand wearing a classic round brilliant diamond solitaire ring in platinum

Featured pieces

A curated selection.

oval brilliant solitaire editorial product image

Oval Brilliant Solitaire

IGI / GIA certified diamonds · platinum & 18K white gold

$11,920
diamond solitaire pendant editorial product image

Diamond Solitaire Pendant

IGI / GIA certified diamonds · platinum & 18K white gold

$5,160
diamond halo studs editorial product image

Diamond Halo Studs

IGI / GIA certified diamonds · platinum & 18K white gold

$2,940
pavé diamond cuff editorial product image

Pavé Diamond Cuff

IGI / GIA certified diamonds · platinum & 18K white gold

$5,280
pavé halo solitaire editorial product image

Pavé Halo Solitaire

IGI / GIA certified diamonds · platinum & 18K white gold

$14,780
pavé halo pendant editorial product image

Pavé Halo Pendant

IGI / GIA certified diamonds · platinum & 18K white gold

$2,560
diamond cluster drops editorial product image

Diamond Cluster Drops

IGI / GIA certified diamonds · platinum & 18K white gold

$2,000
diamond statement bangle editorial product image

Diamond Statement Bangle

IGI / GIA certified diamonds · platinum & 18K white gold

$2,780
cushion halo ring editorial product image

Cushion Halo Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$10,380
diamond cross pendant editorial product image

Diamond Cross Pendant

IGI / GIA certified diamonds · platinum & 18K white gold

$2,840
pavé diamond hoops small editorial product image

Pavé Diamond Hoops Small

IGI / GIA certified diamonds · platinum & 18K white gold

$1,400
round brilliant solitaire editorial product image

Round Brilliant Solitaire

IGI / GIA certified diamonds · platinum & 18K white gold

$13,820
diamond geometric pendant editorial product image

Diamond Geometric Pendant

IGI / GIA certified diamonds · platinum & 18K white gold

$1,860
pavé diamond hoops medium editorial product image

Pavé Diamond Hoops Medium

IGI / GIA certified diamonds · platinum & 18K white gold

$3,200
three-stone trilogy ring editorial product image

Three-Stone Trilogy Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$6,600
pavé diamond hoops large editorial product image

Pavé Diamond Hoops Large

IGI / GIA certified diamonds · platinum & 18K white gold

$1,220
emerald cut engagement ring editorial product image

Emerald Cut Engagement Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$6,500
diamond bow earrings editorial product image

Diamond Bow Earrings

IGI / GIA certified diamonds · platinum & 18K white gold

$2,460
pear brilliant ring editorial product image

Pear Brilliant Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$10,060
diamond climber earrings editorial product image

Diamond Climber Earrings

IGI / GIA certified diamonds · platinum & 18K white gold

$2,180
marquise halo ring editorial product image

Marquise Halo Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$3,200
pavé statement drops editorial product image

Pavé Statement Drops

IGI / GIA certified diamonds · platinum & 18K white gold

$3,060
asscher solitaire editorial product image

Asscher Solitaire

IGI / GIA certified diamonds · platinum & 18K white gold

$3,140
princess cut solitaire editorial product image

Princess Cut Solitaire

IGI / GIA certified diamonds · platinum & 18K white gold

$7,360
hidden halo engagement ring editorial product image

Hidden Halo Engagement Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$11,340
heart brilliant ring editorial product image

Heart Brilliant Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$2,380
cathedral pavé ring editorial product image

Cathedral Pavé Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$1,880
diamond cluster cocktail editorial product image

Diamond Cluster Cocktail

IGI / GIA certified diamonds · platinum & 18K white gold

$4,740
diamond bow cocktail ring editorial product image

Diamond Bow Cocktail Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$5,440
pavé eternity band editorial product image

Pavé Eternity Band

IGI / GIA certified diamonds · platinum & 18K white gold

$17,440
channel set diamond band editorial product image

Channel Set Diamond Band

IGI / GIA certified diamonds · platinum & 18K white gold

$14,200
five-stone diamond band editorial product image

Five-Stone Diamond Band

IGI / GIA certified diamonds · platinum & 18K white gold

$12,580
wide pavé band editorial product image

Wide Pavé Band

IGI / GIA certified diamonds · platinum & 18K white gold

$12,480
floral diamond cluster editorial product image

Floral Diamond Cluster

IGI / GIA certified diamonds · platinum & 18K white gold

$13,520
east-west oval ring editorial product image

East-West Oval Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$10,760
compass-set solitaire editorial product image

Compass-Set Solitaire

IGI / GIA certified diamonds · platinum & 18K white gold

$4,020
trapezoid three-stone editorial product image

Trapezoid Three-Stone

IGI / GIA certified diamonds · platinum & 18K white gold

$4,640
pavé crown ring editorial product image

Pavé Crown Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$4,020
statement cluster ring editorial product image

Statement Cluster Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$11,720
open bypass diamond ring editorial product image

Open Bypass Diamond Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$8,980
diamond crossover ring editorial product image

Diamond Crossover Ring

IGI / GIA certified diamonds · platinum & 18K white gold

$10,620

The timepiece edit

Diamond watches in the Gem Time style.

Diamond bezels, bracelet-style cases, Swiss movements — joining the collection in 2026.

diamond halo cocktail watch editorial product image

Diamond Halo Cocktail Watch

Pavé diamond bezel · Swiss movement · stainless steel

$6,800
heritage art deco watch editorial product image

Heritage Art Deco Watch

Pavé diamond bezel · Swiss movement · stainless steel

$11,800
slim pavé dress watch editorial product image

Slim Pavé Dress Watch

Pavé diamond bezel · Swiss movement · stainless steel

$4,200
high jewelry tonneau watch editorial product image

High Jewelry Tonneau Watch

Pavé diamond bezel · Swiss movement · stainless steel

$14,800

The House

Provenance, certification, and care.

Certified diamond properties

Every center diamond is graded for cut, color, clarity, and carat. We work exclusively with IGI- and GIA-certified stones, including ethically sourced laboratory-grown diamonds, which share the optical, physical, and chemical properties of mined diamonds.

Quiet craftsmanship

Hand-set pavé, finished in platinum and 18K white gold by master setters. Every piece arrives in our archival presentation box with its certificate.

A lifetime of care

Complimentary resizing, replating, and cleaning for the life of the piece. Insured shipping both ways on every return.