If the titanium MRG-B5000 is too cheap and lightweight for you, the 18-karat gold G-Shock G-D5000-9 is apparently still available at Elite TimepieceHK for HK$880,000 (~US$112,406). It is also listed on Chrono24 for $115,236 with Elite TimepieceHK as the seller).
The G-D5000-9 was originally released in 2019 and was limited to only 35 units worldwide. Only two were sold in the U.S. for $70,000 each, and it was also sold in Japan, Hong Kong, Singapore, Taiwan, and the United Arab Emirates. Unlike other full-metal square models like the GMW-B5000, the watch does not have Bluetooth, but it does have Tough Solar power and Multi-Band 6. (The Elite TimepieceHK specs mistakenly lists Bluetooth as a feature.) It is a fully functioning G-Shock with shock resistance and 200-meter water resistance. Being made of gold, the watch weighs a very hefty 297 grams. The watch was also sold at WatchBox in 2020, which has some original photos and video.
Shop for G-Shock: Our Amazon Collections (New Releases) | Best G-Shock Watches | Buying Guides