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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe Gerald Charles Maestro 2.0 Ultra-Thin Gem-Set reference GC2.0-A-DIA-00 is the Timeless Black version, with 52 diamonds set around a 316L stainless-steel case. It pairs an automatic manufacture movement and a 50-hour power reserve with an 8.70 mm-thick case; the brand’s live product page currently lists the price as “PRICE ON DEMAND.”
What is reference GC2.0-A-DIA-00?
It is Gerald Charles’s black-dial Maestro 2.0 Ultra-Thin Gem-Set. The model has a polished 316L stainless-steel case, a black sunburst dial and a diamond-set bezel. Its exact dimensions on the current product page are 39.00 mm wide, 41.70 mm long and 8.70 mm thick. The 2025 technical sheet rounds those figures to 39 × 41 mm and 9 mm. (Gerald Charles product page; 2025 technical sheet)
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The case has a screw-down crown, sapphire crystal and a vertically brushed caseback. Gerald Charles specifies water resistance of 10 ATM/100 m. That rating is a published specification; it does not, by itself, establish which activities the brand recommends.
How many diamonds are on the bezel?
The bezel carries 52 round diamonds, each 1.95 mm, graded FG/VS1, with a stated total weight of 1.55 carats. These are the specifications Gerald Charles publishes for GC2.0-A-DIA-00 in its 2025 technical sheet. (Gerald Charles 2025 technical sheet)
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Movement, display and strap
Automatic GCA2000 movement
The watch uses Gerald Charles’s Swiss Manufacture GCA2000 automatic caliber. The brand lists a 3.7 mm movement thickness, 25.60 mm diameter, 189 components, 28 jewels and a frequency of 28,800 vibrations per hour (4 Hz). Its stated power reserve is 50 hours. Gerald Charles also specifies an Incabloc anti-shock system and reports 5G shock resistance based on testing with a five-axis robotic arm; that is a manufacturer-reported figure, not an independent test result. (Gerald Charles product page; 2025 technical sheet)
Dial and functions
The Timeless Black sunburst dial has baton indexes and dots with white Super-LumiNova that emits green at night. A black date disc with white numerals sits at 6 o’clock. The display comprises central hours, minutes and seconds, plus the date window. (Gerald Charles product page)
Vulcanized-rubber strap
The black HNBR strap is vanilla-scented. Its upper surface has Clous de Paris decoration, while the reverse carries the brand’s tapisserie logo. Gerald Charles lists lengths of 175 mm (S), 190 mm (M) and 212 mm (L), with a 22–20 mm width. Check fit and availability with the brand or an authorized retailer before seeking a replacement. (Gerald Charles product page)
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much does the Gerald Charles Maestro 2.0 Ultra-Thin Gem-Set cost?
The live product page says “PRICE ON DEMAND.” Gerald Charles’s 2025 technical sheet lists GC2.0-A-DIA-00 at USD 21,100, CHF 18,400, EUR 17,900 and GBP 16,900, each excluding VAT. These are published 2025 list prices, not a current local quote or tax-inclusive price. Contact the brand or a retailer for current pricing and availability. (Gerald Charles product page; 2025 technical sheet)
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The product page provides an information-request route and a retailer locator for purchase inquiries. (Gerald Charles product page)
Black diamond, green tsavorite or blue sapphire?
| Version | Collection and case | Dial and bezel stone |
|---|---|---|
| GC2.0-A-DIA-00 | Maestro 2.0 Ultra-Thin; 316L stainless steel | Timeless Black; 52 diamonds |
| Emerald-green gem-set version | Maestro 2.0 Ultra-Thin; 316L stainless steel | Emerald green; 52 tsavorites |
| Blue-sapphire version | Maestro GC Sport; titanium | Blue; 52 sapphires |
The green tsavorite and blue sapphire versions are distinct references, not alternative descriptions of the black diamond watch. The 2025 technical sheet identifies their stone types and counts; confirm the exact current reference, specifications and availability with Gerald Charles before comparing a particular example. (Gerald Charles 2025 technical sheet)
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
